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• java.util.ConcurrentModificationException when serializing non thread-safe maps

  - by [email protected]

  We have got some questions related to exceptions thrown during a map serialization like the following one (in this example, for a LRUMap): java.util.ConcurrentModificationExceptionat org.apache.commons.collections.SequencedHashMap$OrderedIterator.next(Unknown Source)at org.apache.commons.collections.LRUMap.writeExternal(Unknown Source)at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java(Inlined CompiledCode))at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java(Inlined CompiledCode))at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java(Inlined CompiledCode))at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java(Compiled Code))at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(Compiled Code))at com.tangosol.util.ExternalizableHelper.writeSerializable(ExternalizableHelper.java(InlinedCompiled Code))at com.tangosol.util.ExternalizableHelper.writeObjectInternal(ExternalizableHelper.java(Compiled Code))at com.tangosol.util.ExternalizableHelper.serializeInternal(ExternalizableHelper.java(Compiled Code))at com.tangosol.util.ExternalizableHelper.toBinary(ExternalizableHelper.java(InlinedCompiled Code))at com.tangosol.util.ExternalizableHelper.toBinary(ExternalizableHelper.java(InlinedCompiled Code))at com.tangosol.coherence.servlet.TraditionalHttpSessionModel$OptimizedHolder.serializeValue(TraditionalHttpSessionModel.java(Inlined Compiled Code))at com.tangosol.coherence.servlet.TraditionalHttpSessionModel$OptimizedHolder.getBinary(TraditionalHttpSessionModel.java(Compiled Code)) This is caused because LRUMap is not thread safe, so if another thread is modifying the content of that same map while serialization is in progress, then the ConcurrentModificationException will be thrown. Also, the map must be synchronized. Other structures like java.util.HashMap are not thread safe too. To avoid this kind of problems, it is recommended to use a thread-safe and synchronized map such as java.util.Map, java.util.Hashtable or com.tangosol.util.SafeHashMap. You may also need to use the synchronizedMap(Map) method from Class java.util.Collections.  

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• Use ObjectOutputStream and FileOutputStream with FileWriter

  - by wishi

  Hi! Is there any way to use ObjectOutputStream like this: <tag>output of the ObjectOutputStream</tag> If I try: FileOutputStream fos = new FileOutputStream(filename); ObjectOutputStream oos = new ObjectOutputStream(fos); FileWriter fw = new FileWriter(fos); And for example: fw.write("<tag>"); oos.write(cool_object); fw.wrote("</tag>"); I don't get that result. It seems the ObjectOutputStream overwrites the file completly each and every time.

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• Application throws NotSerializableException when run on an jboss cluster

  - by Kalpana

  Environment: JBoss 5.1.0, JBoss Seam 2.2.0 While trying to get my application running in a clustered environment after login I am getting the following exception. Post login we try to store the currentUser in jboss seam session context. java.io.NotSerializableException: org.jboss.seam.util.AnnotatedBeanProperty How to resolve this? java.io.NotSerializableException: org.jboss.seam.util.AnnotatedBeanProperty at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java :1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:14 74) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav a:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java :1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:14 74) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav a:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.ArrayList.writeObject(ArrayList.java:570) at sun.reflect.GeneratedMethodAccessor339.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:94 5) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:14 61) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav a:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java :1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:14 74) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav a:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.HashMap.writeObject(HashMap.java:1001) at sun.reflect.GeneratedMethodAccessor338.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:94 5) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:14 61) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav a:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at org.jboss.ha.framework.server.SimpleCachableMarshalledValue.serialize (SimpleCachableMarshalledValue.java:271) at org.jboss.ha.framework.server.SimpleCachableMarshalledValue.writeExte rnal(SimpleCachableMarshalledValue.java:252) at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java: 1421) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav a:1390) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at org.jboss.cache.marshall.CacheMarshaller200.marshallObject(CacheMarsh aller200.java:460) at org.jboss.cache.marshall.CacheMarshaller300.marshallObject(CacheMarsh aller300.java:47) at org.jboss.cache.marshall.CacheMarshaller200.marshallMap(CacheMarshall er200.java:569) at org.jboss.cache.marshall.CacheMarshaller200.marshallObject(CacheMarsh aller200.java:370) at org.jboss.cache.marshall.CacheMarshaller300.marshallObject(CacheMarsh aller300.java:47) at org.jboss.cache.marshall.CacheMarshaller200.marshallCommand(CacheMars haller200.java:519) at org.jboss.cache.marshall.CacheMarshaller200.marshallObject(CacheMarsh aller200.java:314) at org.jboss.cache.marshall.CacheMarshaller300.marshallObject(CacheMarsh aller300.java:47) at org.jboss.cache.marshall.CacheMarshaller200.marshallCommand(CacheMars haller200.java:519) at org.jboss.cache.marshall.CacheMarshaller200.marshallObject(CacheMarsh aller200.java:314) at org.jboss.cache.marshall.CacheMarshaller300.marshallObject(CacheMarsh aller300.java:47) at org.jboss.cache.marshall.CacheMarshaller200.objectToObjectStream(Cach eMarshaller200.java:191) at org.jboss.cache.marshall.CacheMarshaller200.objectToObjectStream(Cach eMarshaller200.java:136) at org.jboss.cache.marshall.VersionAwareMarshaller.objectToBuffer(Versio nAwareMarshaller.java:182) at org.jboss.cache.marshall.VersionAwareMarshaller.objectToBuffer(Versio nAwareMarshaller.java:52) at org.jboss.cache.marshall.CommandAwareRpcDispatcher$ReplicationTask.ca ll(CommandAwareRpcDispatcher.java:369) at org.jboss.cache.marshall.CommandAwareRpcDispatcher$ReplicationTask.ca ll(CommandAwareRpcDispatcher.java:341) at org.jboss.cache.util.concurrent.WithinThreadExecutor.submit(WithinThr eadExecutor.java:82) at org.jboss.cache.marshall.CommandAwareRpcDispatcher.invokeRemoteComman ds(CommandAwareRpcDispatcher.java:206) at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java: 748) at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java: 716) at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java: 721) at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpc Interceptor.java:161) at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpc Interceptor.java:135) at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpc Interceptor.java:107) at org.jboss.cache.interceptors.ReplicationInterceptor.handleCrudMethod( ReplicationInterceptor.java:160) at org.jboss.cache.interceptors.ReplicationInterceptor.visitPutDataMapCo mmand(ReplicationInterceptor.java:113) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(Co mmandInterceptor.java:131) at org.jboss.cache.commands.AbstractVisitor.visitPutDataMapCommand(Abstr actVisitor.java:60) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.TxInterceptor.attachGtxAndPassUpChain(Tx Interceptor.java:301) at org.jboss.cache.interceptors.TxInterceptor.handleDefault(TxIntercepto r.java:283) at org.jboss.cache.commands.AbstractVisitor.visitPutDataMapCommand(Abstr actVisitor.java:60) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.CacheMgmtInterceptor.visitPutDataMapComm and(CacheMgmtInterceptor.java:97) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.InvocationContextInterceptor.handleAll(I nvocationContextInterceptor.java:178) at org.jboss.cache.interceptors.InvocationContextInterceptor.visitPutDat aMapCommand(InvocationContextInterceptor.java:64) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain .java:287) at org.jboss.cache.invocation.CacheInvocationDelegate.invokePut(CacheInv ocationDelegate.java:705) at org.jboss.cache.invocation.CacheInvocationDelegate.put(CacheInvocatio nDelegate.java:519) at org.jboss.ha.cachemanager.CacheManagerManagedCache.put(CacheManagerMa nagedCache.java:277) at org.jboss.web.tomcat.service.session.distributedcache.impl.jbc.JBossC acheWrapper.put(JBossCacheWrapper.java:148) at org.jboss.web.tomcat.service.session.distributedcache.impl.jbc.Abstra ctJBossCacheService.storeSessionData(AbstractJBossCacheService.java:405) at org.jboss.web.tomcat.service.session.ClusteredSession.processSessionR eplication(ClusteredSession.java:1166) at org.jboss.web.tomcat.service.session.JBossCacheManager.processSession Repl(JBossCacheManager.java:1937) at org.jboss.web.tomcat.service.session.JBossCacheManager.storeSession(J BossCacheManager.java:309) at org.jboss.web.tomcat.service.session.InstantSnapshotManager.snapshot( InstantSnapshotManager.java:51) at org.jboss.web.tomcat.service.session.ClusteredSessionValve.handleRequ est(ClusteredSessionValve.java:147) at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(Clu steredSessionValve.java:94) at org.jboss.web.tomcat.service.session.LockingValve.invoke(LockingValve .java:62) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.proce ss(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invok e(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:598) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) at java.lang.Thread.run(Thread.java:619) 16:38:35,789 ERROR [CommandAwareRpcDispatcher] java.io.NotSerializableException: org.jboss.seam.util.AnnotatedBeanProperty 16:38:35,789 WARN [/a12] Failed to replicate session YwBL69cG-zdm0m5CvzNj3Q__ java.lang.RuntimeException: Failure to marshal argument(s) at org.jboss.cache.marshall.CommandAwareRpcDispatcher$ReplicationTask.ca ll(CommandAwareRpcDispatcher.java:374) at org.jboss.cache.marshall.CommandAwareRpcDispatcher$ReplicationTask.ca ll(CommandAwareRpcDispatcher.java:341) at org.jboss.cache.util.concurrent.WithinThreadExecutor.submit(WithinThr eadExecutor.java:82) at org.jboss.cache.marshall.CommandAwareRpcDispatcher.invokeRemoteComman ds(CommandAwareRpcDispatcher.java:206) at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java: 748) at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java: 716) at org.jboss.cache.RPCManagerImpl.callRemoteMethods(RPCManagerImpl.java: 721) at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpc Interceptor.java:161) at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpc Interceptor.java:135) at org.jboss.cache.interceptors.BaseRpcInterceptor.replicateCall(BaseRpc Interceptor.java:107) at org.jboss.cache.interceptors.ReplicationInterceptor.handleCrudMethod( ReplicationInterceptor.java:160) at org.jboss.cache.interceptors.ReplicationInterceptor.visitPutDataMapCo mmand(ReplicationInterceptor.java:113) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.base.CommandInterceptor.handleDefault(Co mmandInterceptor.java:131) at org.jboss.cache.commands.AbstractVisitor.visitPutDataMapCommand(Abstr actVisitor.java:60) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.TxInterceptor.attachGtxAndPassUpChain(Tx Interceptor.java:301) at org.jboss.cache.interceptors.TxInterceptor.handleDefault(TxIntercepto r.java:283) at org.jboss.cache.commands.AbstractVisitor.visitPutDataMapCommand(Abstr actVisitor.java:60) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.CacheMgmtInterceptor.visitPutDataMapComm and(CacheMgmtInterceptor.java:97) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.base.CommandInterceptor.invokeNextInterc eptor(CommandInterceptor.java:116) at org.jboss.cache.interceptors.InvocationContextInterceptor.handleAll(I nvocationContextInterceptor.java:178) at org.jboss.cache.interceptors.InvocationContextInterceptor.visitPutDat aMapCommand(InvocationContextInterceptor.java:64) at org.jboss.cache.commands.write.PutDataMapCommand.acceptVisitor(PutDat aMapCommand.java:104) at org.jboss.cache.interceptors.InterceptorChain.invoke(InterceptorChain .java:287) at org.jboss.cache.invocation.CacheInvocationDelegate.invokePut(CacheInv ocationDelegate.java:705) at org.jboss.cache.invocation.CacheInvocationDelegate.put(CacheInvocatio nDelegate.java:519) at org.jboss.ha.cachemanager.CacheManagerManagedCache.put(CacheManagerMa nagedCache.java:277) at org.jboss.web.tomcat.service.session.distributedcache.impl.jbc.JBossC acheWrapper.put(JBossCacheWrapper.java:148) at org.jboss.web.tomcat.service.session.distributedcache.impl.jbc.Abstra ctJBossCacheService.storeSessionData(AbstractJBossCacheService.java:405) at org.jboss.web.tomcat.service.session.ClusteredSession.processSessionR eplication(ClusteredSession.java:1166) at org.jboss.web.tomcat.service.session.JBossCacheManager.processSession Repl(JBossCacheManager.java:1937) at org.jboss.web.tomcat.service.session.JBossCacheManager.storeSession(J BossCacheManager.java:309) at org.jboss.web.tomcat.service.session.InstantSnapshotManager.snapshot( InstantSnapshotManager.java:51) at org.jboss.web.tomcat.service.session.ClusteredSessionValve.handleRequ est(ClusteredSessionValve.java:147) at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(Clu steredSessionValve.java:94) at org.jboss.web.tomcat.service.session.LockingValve.invoke(LockingValve .java:62) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(Authentica torBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv e.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.proce ss(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invok e(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j ava:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j ava:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedC onnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal ve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav a:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java :829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce ss(Http11Protocol.java:598) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:44 7) at java.lang.Thread.run(Thread.java:619)

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• @EJB in @ViewScoped managed bean causes java.io.NotSerializableException

  - by ufasoli

  Hi, I've been banging my head around with a @ViewScoped managed-bean. I'm using primeface's "schedule" component in order to display some events. When the user clicks on a specific button a method in the viewscoped bean is called using ajax but every time I get a "java.io.NotSerializableException", if I change the managed-bean scope to request the problem dissapears. What am I doing wrong? any ideas? here is my managed bean : @ManagedBean(name = "schedule") @ViewScoped public class ScheduleMBean implements Serializable { // @EJB // private CongeBean congeBean; @ManagedProperty(value = "#{sessionBean}") private SessionMBean sessionBean; private DefaultScheduleModel visualiseurConges = null; public ScheduleMBean(){ } @PostConstruct public void init() { if(visualiseurConges == null){ visualiseurConges = new DefaultScheduleModel(); } } public void updateSchedule(){ visualiseurConges.addEvent(new DefaultScheduleEvent("test" , new Date(), new Date() )); } public void setVisualiseurConges(DefaultScheduleModel visualiseurConges) { this.visualiseurConges = visualiseurConges; } public DefaultScheduleModel getVisualiseurConges() { return visualiseurConges; } public void setSessionBean(SessionMBean sessionBean) { this.sessionBean = sessionBean; } public SessionMBean getSessionBean() { return sessionBean; } } here is the full-stack trace GRAVE: java.io.NotSerializableException: fr.novae.conseil.gestion.ejb.security.__EJB31_Generated__AuthenticationBean__Intf____Bean__ at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.HashMap.writeObject(HashMap.java:1001) at sun.reflect.GeneratedMethodAccessor592.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.HashMap.writeObject(HashMap.java:1001) at sun.reflect.GeneratedMethodAccessor592.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at com.sun.faces.renderkit.ClientSideStateHelper.doWriteState(ClientSideStateHelper.java:293) at com.sun.faces.renderkit.ClientSideStateHelper.writeState(ClientSideStateHelper.java:167) at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:123) at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:155) at org.primefaces.application.PrimeFacesPhaseListener.writeState(PrimeFacesPhaseListener.java:174) at org.primefaces.application.PrimeFacesPhaseListener.handleAjaxRequest(PrimeFacesPhaseListener.java:111) at org.primefaces.application.PrimeFacesPhaseListener.beforePhase(PrimeFacesPhaseListener.java:74) at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:99) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313) at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57) at com.sun.grizzly.ContextTask.run(ContextTask.java:69) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309) at java.lang.Thread.run(Thread.java:619) thanks in advance

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• Problem in JSF2 with client-side state saving and serialization

  - by marcel

  I have a problem in JSF2 with client side state saving and serialization. I have created a page with a full description and a small class diagram: http://tinyurl.com/jsf2serial. For the client-side state saving I have to implement Serializable at the classes Search, BackingBean and Connection. The exception that was thrown is: java.io.NotSerializableException: org.apache.commons.httpclient.HttpClient at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.HashMap.writeObject(HashMap.java:1001) at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.HashMap.writeObject(HashMap.java:1001) at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at com.sun.faces.renderkit.ClientSideStateHelper.doWriteState(ClientSideStateHelper.java:293) at com.sun.faces.renderkit.ClientSideStateHelper.writeState(ClientSideStateHelper.java:167) at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:123) at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:155) at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:221) at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:397) at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:126) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:127) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:313) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:637) Maybe this is a problem of my design, because I am new in developing Java webapps.

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• Creating a Serializable mock with Mockito error

  - by KwintenP

  I'm trying to create a mock object with Mockito that can be serialized. The object is an interface implementation. When this method is called, I receive an object that I want to pass to another object, hence using the doAnswer(...)-method. This is my code. InterfaceClass obj = mock(InterfaceClass.class, withSettings().serializable()); doAnswer(new Answer<Object>() { public Object answer(InvocationOnMock invocation) throws Throwable { Object[] args = invocation.getArguments(); //Here I do something with the arguments } }).when(obj).someMethod( any(someObject.class)); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutput out = null; try { out = new ObjectOutputStream(bos); out.writeObject(obj); byte[] yourBytes = bos.toByteArray(); } finally { out.close(); bos.close(); } As far as I can tell this should be correct (I'm fairly new to Mockito). But when Serializing my object I get this error: java.io.NotSerializableException: com.trust1t.ocs.signcore.test.InvalidInputTestCase$1 at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1165) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329) at java.util.concurrent.ConcurrentLinkedQueue.writeObject(ConcurrentLinkedQueue.java:644) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:950) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1482) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329) at java.util.LinkedList.writeObject(LinkedList.java:943) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:950) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1482) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1535) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1413) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1159) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:329) at com.trust1t.ocs.signcore.test.InvalidInputTestCase.certificateValidationTest(InvalidInputTestCase.java:117) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) The invalidInputTestCase class is the class containing the test where I'm using this code. It looks as if the mock object references this TestCase somewhere (can't find it though). Am I not correctly implementing this or better ideas to mock?

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• ObjectOutputStream .writeObject

  - by bigbluedragon

  hey i have some problems with this code... This is a JDialogForm in which I have jTextField and button. I want to save data from this Jtextfield when i click button to use it in another window but i don't know why it doesn't work. I always get Exception ek and the message i have put there. private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { String sciezka = jTextField1.getText(); if (sciezka.length() > 0) { Zmienne_pomocnicze zp = new Zmienne_pomocnicze(); zp.setPrzechowaj(sciezka); try { ObjectOutputStream oos = new ObjectOutputStream (new FileOutputStream("danebaza")); oos.writeObject(zp); oos.close(); } catch(Exception ek) { JOptionPane.showMessageDialog(null, "Nie mozna pobrac nazwy_przedmiotu: " + ek); } } this.setVisible(false); } where class Zmienne_pomocnicze looks like this public class Zmienne_pomocnicze { public String n; public void setPrzechowaj (String neew){ n = neew; } public String getPrzechowaj () { return n; } } i guess the problem is with oos.writeObject(zp); but i don't know why.

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• Reuse Client java Socket in a Java Server

  - by user1394983

  I'm devoloping an Java server two control an android online game. It's possible save the client socket of myserversocket.accept() in a variable in Client class? This are very util because this way, server can communicate with client when server wants and no when client contact server. My actual code are: import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.net.ServerSocket; import java.net.Socket; import java.util.ArrayList; import java.util.UUID; import sal.app.shared.Packet; public class Server { private ArrayList<GameSession> games = new ArrayList<GameSession>(); private ArrayList<Client> pendent_clients = new ArrayList<Client>(); private Packet read_packet= new Packet(); private Packet sent_packet = new Packet(); private Socket clientSocket = null; public static void main(String[] args) throws ClassNotFoundException{ ServerSocket serverSocket = null; //DataInputStream dataInputStream = null; //DataOutputStream dataOutputStream = null; ObjectOutputStream oos=null; ObjectInputStream ois=null; Server myServer = new Server(); try { serverSocket = new ServerSocket(7777); System.out.println("Listening :7777"); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } while(true){ try { myServer.clientSocket = new Socket(); myServer.clientSocket = serverSocket.accept(); myServer.read_packet = new Packet(); myServer.sent_packet = new Packet(); oos = new ObjectOutputStream(myServer.clientSocket.getOutputStream()); ois = new ObjectInputStream(myServer.clientSocket.getInputStream()); //dataInputStream = new DataInputStream(clientSocket.getInputStream()); //dataOutputStream = new DataOutputStream(clientSocket.getOutputStream()); //System.out.println("ip: " + clientSocket.getInetAddress()); //System.out.println("message: " + ois.read()); //dataOutputStream.writeUTF("Hello!"); /*while ((myServer.read_packet = (Packet) ois.readObject()) != null) { myServer.handlePacket(myServer.read_packet); break; }*/ myServer.read_packet=(Packet) ois.readObject(); myServer.handlePacket(myServer.read_packet); //oos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally{ if( myServer.clientSocket!= null){ /*try { //myServer.clientSocket.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }*/ } /*if( ois!= null){ try { ois.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if( oos!= null){ try { oos.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } }*/ } } } public void handlePacket(Packet hp) throws IOException { if(hp.getOpCode() == 1) { registPlayer(hp); } } public void registPlayer(Packet p) throws IOException { Client registClient = new Client(this.clientSocket); this.pendent_clients.add(registClient); if(pendent_clients.size() == 2) { initAGame(); } else { ObjectOutputStream out=null; Packet to_send = new Packet(); to_send.setOpCode(4); out = new ObjectOutputStream(registClient.getClientSocket().getOutputStream()); out.writeObject(to_send); } } public void initAGame() throws IOException { Client c1 = pendent_clients.get(0); Client c2 = pendent_clients.get(1); Packet to_send = new Packet(); ObjectOutputStream out=null; GameSession incomingGame = new GameSession(c1,c2); games.add(incomingGame); to_send.setGameId(incomingGame.getGameId()); to_send.setOpCode(5); out = new ObjectOutputStream(c1.getClientSocket().getOutputStream()); out.writeObject(to_send); out = new ObjectOutputStream(c2.getClientSocket().getOutputStream()); out.writeObject(to_send); pendent_clients.clear(); } public Client getClientById(UUID given_id) { for(GameSession gs: games) { if(gs.getClient1().getClientId().equals(given_id)) { return gs.getClient1(); } else if(gs.getClient2().getClientId().equals(given_id)) { return gs.getClient2(); } } return null; } } With this code i got this erros: java.net.SocketException: Broken pipe at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) at java.net.SocketOutputStream.write(SocketOutputStream.java:136) at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1847) at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1756) at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1257) at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1211) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1395) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158) at java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1547) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:333) at Server.initAGame(Server.java:146) at Server.registPlayer(Server.java:120) at Server.handlePacket(Server.java:106) at Server.main(Server.java:63) This error ocurre when second client connect and server try to send an Packet to previous client 1 in function initGame() in this code: out = new ObjectOutputStream(c1.getClientSocket().getOutputStream()); out.writeObject(to_send); my android code is this: package sal.app; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.net.Socket; import java.net.UnknownHostException; import sal.app.logic.DataBaseManager; import sal.app.shared.Packet; import android.app.Activity; import android.os.Bundle; import android.view.Window; import android.view.WindowManager; public class MultiPlayerWaitActivity extends Activity{ private DataBaseManager db; public void onCreate(Bundle savedInstanceState) { super.requestWindowFeature(Window.FEATURE_NO_TITLE); super.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); super.onCreate(savedInstanceState); setContentView(R.layout.multiwaitlayout); db=DataBaseManager.getSalDatabase(this); db.teste(); try { db.createDataBase(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } Socket socket = null; ObjectOutputStream outputStream = null; ObjectInputStream inputStream = null; //System.out.println("dadadad"); try { socket = new Socket("192.168.1.4", 7777); //Game = new MultiPlayerGame(new ServerManager("192.168.1.66"),new Session(), new Player("")); outputStream = new ObjectOutputStream(socket.getOutputStream()); inputStream = new ObjectInputStream(socket.getInputStream()); //dataOutputStream.writeUTF(textOut.getText().toString()); //textIn.setText(dataInputStream.readUTF()); Packet p = new Packet(); Packet r = new Packet(); p.setOpCode(1); outputStream.writeObject(p); /*try { r=(Packet)inputStream.readObject(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); }*/ //while(true){ //dataInputStream = new DataInputStream(clientSocket.getInputStream()); //dataOutputStream = new DataOutputStream(clientSocket.getOutputStream()); //System.out.println("ip: " + clientSocket.getInetAddress()); //System.out.println("message: " + ois.read()); //dataOutputStream.writeUTF("Hello!"); /*while ((r= (Packet) inputStream.readObject()) != null) { handPacket(r); break; }*/ r=(Packet) inputStream.readObject(); handPacket(r); //oos.close(); //} /*System.out.println(r.getOpCode()); if(r.getOpCode() == 5) { this.finish(); }*/ } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } /*finally{ if (socket != null){ try { socket.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (outputStream != null){ try { outputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (inputStream != null){ try { inputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }*/ //catch (ClassNotFoundException e) { // TODO Auto-generated catch block //e.printStackTrace(); //} catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void handPacket(Packet hp) { if(hp.getOpCode() == 5) { this.finish(); } this.finish(); } } Regards

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• java.io.EOFException while writing and reading froma servlet

  - by mithun1538

  Hello everyone, I have the following code on the applet side: URL servlet = new URL(appletCodeBase, "FormsServlet?form=requestRoom"); URLConnection con = servlet.openConnection(); con.setDoOutput(true); con.setDoInput(true); con.setUseCaches(false); con.setRequestProperty("Content-Type", "application/octet-stream"); ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream()); out.writeObject(user);//user is an object of a serializable class out.flush(); out.close(); ObjectInputStream in = new ObjectInputStream(con.getInputStream()); status = (String)in.readObject(); in.close(); if("success".equals("status")) { JOptionPane.showMessageDialog(rootPane, "Request submitted successfully."); } else { JOptionPane.showMessageDialog(rootPane, "ERROR! Request cannot be made at this time"); } In the servlet side I recieve the code as follows: form = request.getParameter("form"); if("requestRoom".equals(form)) { String fullName, eID, reason; UserRequestingRoom user; try { in = new ObjectInputStream(request.getInputStream()); user = (UserRequestingRoom)in.readObject(); fullName = user.getFullName(); eID = user.getEID(); reason = user.getReason(); Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/chat_applet","root",""); PreparedStatement statement = con.prepareStatement("INSERT INTO REQCONFROOM VALUES(\"" + fullName + "\",\"" + eID + "\",\"" + reason + "\")"); statement.execute(); out = new ObjectOutputStream(response.getOutputStream()); out.writeObject("success"); out.flush(); } catch (Exception e) { e.printStackTrace(); out = new ObjectOutputStream(response.getOutputStream()); out.writeObject("fail"); out.flush(); } } When I click on the button that calls the code in the applet side, I get the following error: java.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source) at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source) at java.io.ObjectInputStream.readStreamHeader(Unknown Source) at java.io.ObjectInputStream.<init>(Unknown Source) at com.org.RequestRoomForm.requestActionPerformed(RequestRoomForm.java:151) **//Line 151 is "ObjectInputStream in..." line in the applet code** at com.org.RequestRoomForm.access$000(RequestRoomForm.java:7) at com.org.RequestRoomForm$1.actionPerformed(RequestRoomForm.java:62) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Why am I getting this error? I have flushed when I output, I have closed the connections also, yet I get the error. Any reason for this?

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• Strange Java Socket Behavior (Connects, but Doesn't Send)

  - by Donald Campbell

  I have a fairly complex project that boils down to a simple Client / Server communicating through object streams. Everything works flawlessly for two consecutive connections (I connect once, work, disconnect, then connect again, work, and disconnect). The client connects, does its business, and then closes. The server successfully closes both the object output stream and the socket, with no IO errors. When I try to connect a third time, the connection appears to go through (the ServerSocket.accept() method goes through and an ObjectOutputStream is successfully created). No data is passed, however. The inputStream.readUnshared() method simply blocks. I have taken the following memory precautions: When it comes time to close the sockets, all running threads are stopped, and all objects are nulled out. After every writeUnshared() method call, the ObjectOutputBuffer is flushed and reset. Has anyone encountered a similar problem, or does anyone have any suggestions? I'm afraid my project is rather large, and so copying code is problematic. The project boils down to this: SERVER MAIN ServerSocket serverSocket = new ServerSocket(port); while (true) { new WorkThread(serverSocket.accept()).start(); } WORK THREAD (SERVER) public void run() { ObjectInputBuffer inputBuffer = new ObjectInputBuffer(new BufferedInputStream(socket.getInputStream())); while (running) { try { Object myObject = inputBuffer.readUnshared(); // do work is not specified in this sample doWork(myObject); } catch (IOException e) { running = false; } } try { inputBuffer.close(); socket.close(); } catch (Exception e) { System.out.println("Could not close."); } } CLIENT public Client() { Object myObject; Socket mySocket = new Socket(address, port); try { ObjectOutputBuffer output = new ObjectOutputBuffer(new BufferedOutputStream(mySocket.getOutputStream())); output.reset(); output.flush(); } catch (Exception e) { System.out.println("Could not get an input."); mySocket.close(); return; } // get object data is not specified in this sample. it simply returns a serializable object myObject = getObjectData(); while (myObject != null) { try { output.writeUnshared(myObject); output.reset(); output.flush(); } catch (Exception e) { e.printStackTrace(); break; } // catch } // while try { output.close(); socket.close(); } catch (Exception e) { System.out.println("Could not close."); } } Thank you to everyone who may be able to help!

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• Problem with object serialization in Applet-Servlet communication

  - by Bruce

  Hi guys, I spent a lot of time on thinking what is wrong with the following code. I send the object from my applet to servlet and then I read the object from servlet. Everything goes fine till reading serialized object from the servlet - I got IOException. Thank you in advance! Here is the code: Applet: try { URL servletURL = new URL(this.getCodeBase().getProtocol(), this.getCodeBase().getHost(), this.getCodeBase().getPort(), "/MyApplet"); URLConnection servletConnection = servletURL.openConnection(); servletConnection.setDoInput( true ); servletConnection.setDoOutput( true ); servletConnection.setUseCaches( false ); servletConnection.setRequestProperty( "Content-Type", "application/x-java-serialized-object" ); ObjectOutputStream output; output = new ObjectOutputStream( servletConnection.getOutputStream( ) ); output.writeObject( someObject ); output.flush( ); output.close( ); ObjectInputStream input = new ObjectInputStream( servletConnection.getInputStream( ) ); // Here I got the exception myObject = ( SomeObject ) input.readObject( ); } catch (java.io.IOException ioe) { System.err.println(ioe.getStackTrace()); } catch (Exception e) { System.err.println(e.getStackTrace()); } Servlet: response.setContentType("application/x-java-serialized-object"); try { ObjectInputStream inputFromApplet = new ObjectInputStream(request.getInputStream()); SomeObject myObject = (SomeObject) inputFromApplet.readObject(); ObjectOutputStream outputToApplet = new ObjectOutputStream(response.getOutputStream()); outputToApplet.writeObject(myObject); outputToApplet.flush(); } catch(Exception e) { // ... }

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• Threads are facing deadlock in socket program [migrated]

  - by ankur.trapasiya

  I am developing one program in which a user can download a number of files. Now first I am sending the list of files to the user. So from the list user selects one file at a time and provides path where to store that file. In turn it also gives the server the path of file where does it exist. I am following this approach because I want to give stream like experience without file size limitation. Here is my code.. 1) This is server which gets started each time I start my application public class FileServer extends Thread { private ServerSocket socket = null; public FileServer() { try { socket = new ServerSocket(Utils.tcp_port); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Override public void run() { try { System.out.println("request received"); new FileThread(socket.accept()).start(); } catch (IOException ex) { ex.printStackTrace(); } } } 2) This thread runs for each client separately and sends the requested file to the user 8kb data at a time. public class FileThread extends Thread { private Socket socket; private String filePath; public String getFilePath() { return filePath; } public void setFilePath(String filePath) { this.filePath = filePath; } public FileThread(Socket socket) { this.socket = socket; System.out.println("server thread" + this.socket.isConnected()); //this.filePath = filePath; } @Override public void run() { // TODO Auto-generated method stub try { ObjectInputStream ois=new ObjectInputStream(socket.getInputStream()); try { //************NOTE filePath=(String) ois.readObject(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } File f = new File(this.filePath); byte[] buf = new byte[8192]; InputStream is = new FileInputStream(f); BufferedInputStream bis = new BufferedInputStream(is); ObjectOutputStream oos = new ObjectOutputStream( socket.getOutputStream()); int c = 0; while ((c = bis.read(buf, 0, buf.length)) > 0) { oos.write(buf, 0, c); oos.flush(); // buf=new byte[8192]; } oos.close(); //socket.shutdownOutput(); // client.shutdownOutput(); System.out.println("stop"); // client.shutdownOutput(); ois.close(); // Thread.sleep(500); is.close(); bis.close(); socket.close(); } catch (IOException ex) { ex.printStackTrace(); } } } NOTE: here filePath represents the path of the file where it exists on the server. The client who is connecting to the server provides this path. I am managing this through sockets and I am successfully receiving this path. 3) FileReceiverThread is responsible for receiving the data from the server and constructing file from this buffer data. public class FileReceiveThread extends Thread { private String fileStorePath; private String sourceFile; private Socket socket = null; public FileReceiveThread(String ip, int port, String fileStorePath, String sourceFile) { this.fileStorePath = fileStorePath; this.sourceFile = sourceFile; try { socket = new Socket(ip, port); System.out.println("receive file thread " + socket.isConnected()); } catch (IOException ex) { ex.printStackTrace(); } } @Override public void run() { try { ObjectOutputStream oos = new ObjectOutputStream( socket.getOutputStream()); oos.writeObject(sourceFile); oos.flush(); // oos.close(); File f = new File(fileStorePath); OutputStream os = new FileOutputStream(f); BufferedOutputStream bos = new BufferedOutputStream(os); byte[] buf = new byte[8192]; int c = 0; //************ NOTE ObjectInputStream ois = new ObjectInputStream( socket.getInputStream()); while ((c = ois.read(buf, 0, buf.length)) > 0) { // ois.read(buf); bos.write(buf, 0, c); bos.flush(); // buf = new byte[8192]; } ois.close(); oos.close(); // os.close(); bos.close(); socket.close(); //Thread.sleep(500); } catch (IOException ex) { ex.printStackTrace(); } } } NOTE : Now the problem that I am facing is at the first time when the file is requested the outcome of the program is same as my expectation. I am able to transmit any size of file at first time. Now when the second file is requested (e.g. I have sent file a,b,c,d to the user and user has received file a successfully and now he is requesting file b) the program faces deadlock at this situation. It is waiting for socket's input stream. I put breakpoint and tried to debug it but it is not going in FileThread's run method second time. I could not find out the mistake here. Basically I am making a LAN Messenger which works on LAN. I am using SWT as UI framework.

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• easiest and best way to make a server queue java

  - by houlahan

  i have a server at the moment which makes a new thread for every user connected but after about 6 people are on the server for more than 15 mins it tends to flop and give me java heap out of memory error i have 1 thread that checks with a mysql database every 30 seconds to see if any of the users currently logged on have any new messages. what would be the easiest way to implement a server queue? this is the my main method for my server: public class Server { public static int MaxUsers = 1000; //public static PrintStream[] sessions = new PrintStream[MaxUsers]; public static ObjectOutputStream[] sessions = new ObjectOutputStream[MaxUsers]; public static ObjectInputStream[] ois = new ObjectInputStream[MaxUsers]; private static int port = 6283; public static Connection conn; static Toolkit toolkit; static Timer timer; public static void main(String[] args) { try { conn = (Connection) Mysql.getConnection(); } catch (Exception ex) { Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex); } System.out.println("****************************************************"); System.out.println("* *"); System.out.println("* Cloud Server *"); System.out.println("* ©2010 *"); System.out.println("* *"); System.out.println("* Luke Houlahan *"); System.out.println("* *"); System.out.println("* Server Online *"); System.out.println("* Listening On Port " + port + " *"); System.out.println("* *"); System.out.println("****************************************************"); System.out.println(""); mailChecker(); try { int i; ServerSocket s = new ServerSocket(port); for (i = 0; i < MaxUsers; ++i) { sessions[i] = null; } while (true) { try { Socket incoming = s.accept(); boolean found = false; int numusers = 0; int usernum = -1; synchronized (sessions) { for (i = 0; i < MaxUsers; ++i) { if (sessions[i] == null) { if (!found) { sessions[i] = new ObjectOutputStream(incoming.getOutputStream()); ois[i]= new ObjectInputStream(incoming.getInputStream()); new SocketHandler(incoming, i).start(); found = true; usernum = i; } } else { numusers++; } } if (!found) { ObjectOutputStream temp = new ObjectOutputStream(incoming.getOutputStream()); Person tempperson = new Person(); tempperson.setFlagField(100); temp.writeObject(tempperson); temp.flush(); temp = null; tempperson = null; incoming.close(); } else { } } } catch (IOException ex) { System.out.println(1); Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex); } } } catch (IOException ex) { System.out.println(2); Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex); } } public static void mailChecker() { toolkit = Toolkit.getDefaultToolkit(); timer = new Timer(); timer.schedule(new mailCheck(), 0, 10 * 1000); } }

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• Java deadlock problem....

  - by markovuksanovic

  I am using java sockets for communication. On the client side I have some processing and at this point I send an object to the cient. The code is as follows: while (true) { try { Socket server = new Socket("localhost", 3000); OutputStream os = server.getOutputStream(); InputStream is = server.getInputStream(); CommMessage commMessage = new CommMessageImpl(); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(commMessage); os.write(bos.toByteArray()); os.flush(); byte[] buff = new byte[512]; int bytesRead = 0; ByteArrayOutputStream receivedObject = new ByteArrayOutputStream(); while ((bytesRead = is.read(buff)) > -1) { receivedObject.write(buff, 0, bytesRead); System.out.println(receivedObject); } os.close(); Thread.sleep(10000); } catch (IOException e) { } catch (InterruptedException e) { } } Next on the server side I have the following code to read the object and write the response (Which is just an echo message) public void startServer() { Socket client = null; try { server = new ServerSocket(3000); logger.log(Level.INFO, "Waiting for connections."); client = server.accept(); logger.log(Level.INFO, "Accepted a connection from: " + client.getInetAddress()); os = new ObjectOutputStream(client.getOutputStream()); is = new ObjectInputStream(client.getInputStream()); // Read contents of the stream and store it into a byte array. byte[] buff = new byte[512]; int bytesRead = 0; ByteArrayOutputStream receivedObject = new ByteArrayOutputStream(); while ((bytesRead = is.read(buff)) > -1) { receivedObject.write(buff, 0, bytesRead); } // Check if received stream is CommMessage or not contents. CommMessage commMessage = getCommMessage(receivedObject); if (commMessage != null) { commMessage.setSessionState(this.sessionManager.getState().getState()); ByteArrayOutputStream bos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(bos); oos.writeObject(commMessage); os.write(bos.toByteArray()); System.out.println(commMessage.getCommMessageType()); } else { processData(receivedObject, this.sessionManager); } os.flush(); } catch (IOException e) { } finally { try { is.close(); os.close(); client.close(); server.close(); } catch (IOException e) { } } } The above code works ok if I do not try to read data on the client side (If i exclude the code related to reading). But if I have that code, for some reason, I get some kind of deadlock when accessing input streams. Any ideas what I might have done wrong? Thanks in advance.

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• Java Apache Commons users

  - by Tom Brito

  Is there anything in apache commons to convert a Object to byte array, like the following method does? public static byte[] toByteArray(Object obj) throws IOException { ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(baos); oos.writeObject(obj); oos.flush(); byte[] data = baos.toByteArray(); return data; } [try-finally block closing buffers were omitted to simplify]

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• Java: unwanted characters at the beginning of a file as result of serialization

  - by Patrick

  hi, when I write a new text file in Java, I get these characters at the beginning of the file: ¨Ìt This is the code: public static void writeMAP(String filename, Object object) throws IOException { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filename)); oos.writeObject(object); oos.close(); } thanks

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• Java: unwanted characters at the beginning of a text file

  - by Patrick

  hi, when I write a new text file in Java, I get these characters at the beginning of the file: ¨Ìt This is the code: public static void writeMAP(String filename, Object object) throws IOException { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(filename)); oos.writeObject(object); oos.close(); } thanks

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• Unreleased Resource: Streams

  - by Vibhas

  Hi freinds i am getting a warning in the fortify report for the following code: if (null != serverSocket) { OutputStream socketOutPutStream = serverSocket .getOutputStream(); if (null != socketOutPutStream) { oos = new ObjectOutputStream(socketOutPutStream); if (null != oos) { int c; log.info("i am in Step 3 ooss " + oos); while ((c = mergedIS.read()) != -1) { oos.writeByte(c); } } log.info("i am in Step 4 "); } } in the catch block i have mentioned : catch (UnknownHostException e) { //catch exception Vibhas added log.info("UnknownHostException occured"); } catch (IOException e) { //catch exception Vibhas added log.info("IOException occured"); } catch (Exception e) { //catch exception //log.info("error occured in copyFile in utils-->"+e.getMessage()+"file name is-->"+destiFileName); }finally{ if (null != oos){ oos.flush(); oos.close(); } catch (Exception e) { //catch exception } } Warning which i am getting in the fortify report is: Abstract: The function copyFile() in ODCUtil.java sometimes fails to release a system resource allocated by getOutputStream() on line 61. Sink: ODCUtil.java:64 oos = new ObjectOutputStream(socketOutPutStream)() 62 if (null != socketOutPutStream) { 63 64 oos = new ObjectOutputStream(socketOutPutStream); 65 if (null != oos) { 66 int c;

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• Avoiding duplicate objects in Java deserialization

  - by YGL

  I have two lists (list1 and list2) containing references to some objects, where some of the list entries may point to the same object. Then, for various reasons, I am serializing these lists to two separate files. Finally, when I deserialize the lists, I would like to ensure that I am not re-creating more objects than needed. In other words, it should still be possible for some entry of List1 to point to the same object as some entry in List2. MyObject obj = new MyObject(); List<MyObject> list1 = new ArrayList<MyObject>(); List<MyObject> list2 = new ArrayList<MyObject>(); list1.add(obj); list2.add(obj); // serialize to file1.ser ObjectOutputStream oos = new ObjectOutputStream(...); oos.writeObject(list1); oos.close(); // serialize to file2.ser oos = new ObjectOutputStream(...); oos.writeObject(list2); oos.close(); I think that sections 3.4 and A.2 of the spec say that deserialization strictly results in the creation of new objects, but I'm not sure. If so, some possible solutions might involve: Implementing equals() and hashCode() and checking references manually. Creating a "container class" to hold everything and then serializing the container class. Is there an easy way to ensure that objects are not duplicated upon deserialization? Thanks.

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• How do I solve this indexOutOfBoundsException in my server send/receive thread?

  - by Stefan Schouten

  I am creating a multiplayer game in Java with a server and multiple clients. Everything runs perfectly, until I press the Kick-button in the server to kick a client. Error at receive thread of server, after kicking the first person who joined out of three: java.lang.IndexOutOfBoundsException: Index: 2, Size: 2 at java.util.ArrayList.rangeCheck(ArrayList.java:604) at java.util.ArrayList.get(ArrayList.java:382) > at networktest.Server$3.run(Server.java:186) at java.lang.Thread.run(Thread.java:722) The pointed line is the ois = new ObjectInputStream where I send datatype. The server kicks the first person perfectly, but removes the second one in the list too, with an error of java.lang.ClassCastException. server receive: private static Thread receive = new Thread() { @Override public void run() { ObjectInputStream ois; while (true) { for (int i = 0; i < list_sockets.size(); i++) { try { ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); int receive_state = (Integer) ois.readObject(); // receive state ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); byte datatype = (byte) ois.readObject(); // receive datatype if(datatype == 2){ ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); ChatLine chatLine = (ChatLine) ois.readObject(); // receive ChatLine } else if (datatype == 0){ ois = new ObjectInputStream(list_sockets.get(i).getInputStream()); DataPackage dp = (DataPackage) ois.readObject(); // receive dp list_data.set(i, dp); } if (receive_state == 1) // Client Disconnected by User { disconnectClient(i); i--; } } catch (Exception ex) // Client Disconnected (Client Didn't Notify Server About Disconnecting) { System.err.println("Error @ receive:"); ex.printStackTrace(); disconnectClient(i); i--; } } try { this.sleep(3); } catch (InterruptedException ex) { Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex); } } } }; user send: Thread send = new Thread() { public void run() { ObjectOutputStream oos; byte datatype = 0; while (connected){ if (socket != null){ try { DataPackage dp = new DataPackage(); dp.x = Client.player.x; dp.y = Client.player.y; dp.username = username; dp.charType = charType; dp.walking = (byte)Client.player.walking; if (Client.outputChatLine.line != null) datatype = 2; else { datatype = 0; } oos = new ObjectOutputStream(socket.getOutputStream()); oos.writeObject(Integer.valueOf(Client.this.state)); // send state oos = new ObjectOutputStream(socket.getOutputStream()); oos.writeObject(Byte.valueOf(datatype)); // send datatype if (datatype == 2) { oos.reset(); oos.writeObject(Client.outputChatLine); Client.outputChatLine = new ChatLine(); } else { oos = new ObjectOutputStream(socket.getOutputStream()); oos.writeObject(dp); } if (Client.this.state == 1) { connected = false; socket = null; JOptionPane.showMessageDialog(null, "Client Disconnected", "Info", 1); System.exit(0); } } catch (Exception ex){} } try { this.sleep(2); } catch (InterruptedException ex) { Logger.getLogger(Client.class.getName()).log(Level.SEVERE, null, ex); } } } }; disconnect client method: public static void disconnectClient(int index) { try { list_clients_model.removeElementAt(index); list_client_states.remove(index); list_data.remove(index); list_sockets.remove(index); } catch (Exception ex) {} } Does anyone know how to solve this?

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• Can i create different observables and different corresponding observers in java?

  - by mithun1538

  Hello everyone, Currently, I have one observable and many observers. What i need is different observables, and depending on the observable, different observers. How do I achieve this? ( For understanding, assume I have different apples - say apple1 apple2... I have observer_1 observing apple1, observer_2 observing apple2, observer_3 observing apple 2 and so on..). I tried creating different objects of the Observable class, but since observers are observing the same class of observable, I don't know how to access a particular instance of the Observable. I have included the following servlet code that contains Observer and Observable classes: public class CustomerServlet extends HttpServlet { public String getNextMessage() { // Create a message sink to wait for a new message from the // message source. return new MessageSink().getNextMessage(source); } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ObjectOutputStream dout = new ObjectOutputStream(response.getOutputStream()); String recMSG = getNextMessage(); dout.writeObject(recMSG); dout.flush(); } public void broadcastMessage(String message) { // Send the message to all the HTTP-connected clients by giving the // message to the message source source.sendMessage(message); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { ObjectInputStream din= new ObjectInputStream(request.getInputStream()); String message = (String)din.readObject(); ObjectOutputStream dout = new ObjectOutputStream(response.getOutputStream()); dout.writeObject("1"); dout.flush(); if (message != null) { broadcastMessage(message); } // Set the status code to indicate there will be no response response.setStatus(response.SC_NO_CONTENT); } catch (Exception e) { e.printStackTrace(); } } @Override public String getServletInfo() { return "Short description"; }// </editor-fold> MessageSource source = new MessageSource(); } class MessageSource extends Observable { public void sendMessage(String message) { setChanged(); notifyObservers(message); } } class MessageSource extends Observable { public void sendMessage(String message) { setChanged(); notifyObservers(message); } } class MessageSink implements Observer { String message = null; // set by update() and read by getNextMessage() // Called by the message source when it gets a new message synchronized public void update(Observable o, Object arg) { // Get the new message message = (String)arg; // Wake up our waiting thread notify(); } // Gets the next message sent out from the message source synchronized public String getNextMessage(MessageSource source) { // Tell source we want to be told about new messages source.addObserver(this); // Wait until our update() method receives a message while (message == null) { try { wait(); } catch (Exception e) { System.out.println("Exception has occured! ERR ERR ERR"); } } // Tell source to stop telling us about new messages source.deleteObserver(this); // Now return the message we received // But first set the message instance variable to null // so update() and getNextMessage() can be called again. String messageCopy = message; message = null; return messageCopy; } }

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• Java invalid stream header Problem

  - by David zsl

  Hi all, im writen a client-server app, and now i´m facing a problem that I dont know how to solve: This is the client: try { Socket socket = new Socket(ip, port); ObjectOutputStream ooos = new ObjectOutputStream(socket .getOutputStream()); SendMessage message = new SendMessage(); message.numDoc = value.numDoc; message.docFreq = value.docFreq; message.queryTerms = query; message.startIndex = startIndex; message.count = count; message.multiple = false; message.ips = null; message.ports = null; message.value = true; message.docFreq = value.docFreq; message.numDoc = value.numDoc; ooos.writeObject(message); ObjectInputStream ois = new ObjectInputStream(socket .getInputStream()); ComConstants mensajeRecibido; Object mensajeAux; String mensa = null; byte[] by = null; do { mensajeAux = ois.readObject(); if (mensajeAux instanceof ComConstants) { System.out.println("Thread by Thread has Search Results"); String test; ByteArrayOutputStream testo = new ByteArrayOutputStream(); mensajeRecibido = (ComConstants) mensajeAux; byte[] wag; testo.write( mensajeRecibido.fileContent, 0, mensajeRecibido.okBytes); wag = testo.toByteArray(); if (by == null) { by = wag; } else { int size = wag.length; System.arraycopy(wag, 0, by, 0, size); } } else { System.err.println("Mensaje no esperado " + mensajeAux.getClass().getName()); break; } } while (!mensajeRecibido.lastMessage); //ByteArrayInputStream bs = new ByteArrayInputStream(by.toByteArray()); // bytes es el byte[] ByteArrayInputStream bs = new ByteArrayInputStream(by); ObjectInputStream is = new ObjectInputStream(bs); QueryWithResult[] unObjetoSerializable = (QueryWithResult[])is.readObject(); is.close(); //AQUI TOCARIA METER EL QUICKSORT XmlConverter xce = new XmlConverter(unObjetoSerializable, startIndex, count); String serializedd = xce.runConverter(); tempFinal = serializedd; ois.close(); socket.close(); } catch (Exception e) { e.printStackTrace(); } i++; } And this is the sender: try { QueryWithResult[] outputLine; Operations op = new Operations(); boolean enviadoUltimo=false; ComConstants mensaje = new ComConstants(); mensaje.queryTerms = query; outputLine = op.processInput(query, value); //String c = new String(); //c = outputLine.toString(); //StringBuffer swa = sw.getBuffer(); ByteArrayOutputStream bs= new ByteArrayOutputStream(); ObjectOutputStream os = new ObjectOutputStream (bs); os.writeObject(outputLine); os.close(); byte[] mybytearray = bs.toByteArray(); ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(mybytearray); BufferedInputStream bis = new BufferedInputStream(byteArrayInputStream); int readed = bis.read(mensaje.fileContent,0,4000); while (readed > -1) { mensaje.okBytes = readed; if (readed < ComConstants.MAX_LENGTH) { mensaje.lastMessage = true; enviadoUltimo=true; } else mensaje.lastMessage = false; oos.writeObject(mensaje); if (mensaje.lastMessage) break; mensaje = new ComConstants(); mensaje.queryTerms = query; readed = bis.read(mensaje.fileContent); } if (enviadoUltimo==false) { mensaje.lastMessage=true; mensaje.okBytes=0; oos.writeObject(mensaje); } oos.close(); } catch (Exception e) { e.printStackTrace(); } } And this is the error log: Thread by Thread has Search Results java.io.StreamCorruptedException: invalid stream header: 20646520 at java.io.ObjectInputStream.readStreamHeader(Unknown Source) at java.io.ObjectInputStream.<init>(Unknown Source) at org.tockit.comunication.ServerThread.enviaFicheroMultiple(ServerThread.java:747) at org.tockit.comunication.ServerThread.run(ServerThread.java:129) at java.lang.Thread.run(Unknown Source) Where at org.tockit.comunication.ServerThread.enviaFicheroMultiple(ServerThread.java:747) is this line ObjectInputStream is = new ObjectInputStream(bs); on the 1st code just after while (!mensajeRecibido.lastMessage); Any ideas?

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• Receiving XML from Actionscript on Servlet - Invalid Stream Header

  - by John Doe

  I have an ActionScript File sending XML to my servlet. I am only getting empty arrays on output. In ActionScript I checked and I am in fact sending the correct XML. Anyone know what Exactly I'm doing wrong? Exception error is: java.io.StreamCorruptedException: invalid stream header package myDungeonAccessor; try { System.out.println("HEADERS: " + request.getHeaderNames()); ObjectInputStream in = new ObjectInputStream(request.getInputStream()); System.out.println(in); ObjectOutputStream out = new ObjectOutputStream(response.getOutputStream()); } catch(Exception e) { e.printStackTrace(); } Exception

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• Android serialization: ImageView

  - by embo

  I have a simple class: public class Ball2 extends ImageView implements Serializable { public Ball2(Context context) { super(context); } } Serialization ok: private void saveState() throws IOException { ObjectOutputStream oos = new ObjectOutputStream(openFileOutput("data", MODE_PRIVATE)); try { Ball2 data = new Ball2(Game2.this); oos.writeObject(data); oos.flush(); } catch (Exception e) { Log.e("write error", e.getMessage(), e); } finally { oos.close(); } } But deserealization private void loadState() throws IOException { ObjectInputStream ois = new ObjectInputStream(openFileInput("data")); try { Ball2 data = (Ball2) ois.readObject(); } catch (Exception e) { Log.e("read error", e.getMessage(), e); } finally { ois.close(); } } fail with error: 03-24 21:52:43.305: ERROR/read error(1948): java.io.InvalidClassException: android.widget.ImageView; IllegalAccessException How deserialize object correctly?

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• Java programming accessing object variables

  - by Haxed

  Helo, there are 3 files, CustomerClient.java, CustomerServer.java and Customer.java PROBLEM: In the CustomerServer.java file, i get an error when I compile the CustomerServer.java at line : System.out.println(a[k].getName()); ERROR: init: deps-jar: Compiling 1 source file to C:\Documents and Settings\TLNA\My Documents\NetBeansProjects\Server\build\classes C:\Documents and Settings\TLNA\My Documents\NetBeansProjects\Server\src\CustomerServer.java:44: cannot find symbol symbol : method getName() location: class Customer System.out.println(a[k].getName()); 1 error BUILD FAILED (total time: 0 seconds) CustomerClient.java import java.io.*; import java.net.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; public class CustomerClient extends JApplet { private JTextField jtfName = new JTextField(32); private JTextField jtfSeatNo = new JTextField(32); // Button for sending a student to the server private JButton jbtRegister = new JButton("Register to the Server"); // Indicate if it runs as application private boolean isStandAlone = false; // Host name or ip String host = "localhost"; public void init() { JPanel p1 = new JPanel(); p1.setLayout(new GridLayout(2, 1)); p1.add(new JLabel("Name")); p1.add(jtfName); p1.add(new JLabel("Seat No.")); p1.add(jtfSeatNo); add(p1, BorderLayout.CENTER); add(jbtRegister, BorderLayout.SOUTH); // Register listener jbtRegister.addActionListener(new ButtonListener()); // Find the IP address of the Web server if (!isStandAlone) { host = getCodeBase().getHost(); } } /** Handle button action */ private class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent e) { try { // Establish connection with the server Socket socket = new Socket(host, 8000); // Create an output stream to the server ObjectOutputStream toServer = new ObjectOutputStream(socket.getOutputStream()); // Get text field String name = jtfName.getText().trim(); String seatNo = jtfSeatNo.getText().trim(); // Create a Student object and send to the server Customer s = new Customer(name, seatNo); toServer.writeObject(s); } catch (IOException ex) { System.err.println(ex); } } } /** Run the applet as an application */ public static void main(String[] args) { // Create a frame JFrame frame = new JFrame("Register Student Client"); // Create an instance of the applet CustomerClient applet = new CustomerClient(); applet.isStandAlone = true; // Get host if (args.length == 1) { applet.host = args[0]; // Add the applet instance to the frame } frame.add(applet, BorderLayout.CENTER); // Invoke init() and start() applet.init(); applet.start(); // Display the frame frame.pack(); frame.setVisible(true); } } CustomerServer.java import java.io.*; import java.net.*; public class CustomerServer { private String name; private int i; private ObjectOutputStream outputToFile; private ObjectInputStream inputFromClient; public static void main(String[] args) { new CustomerServer(); } public CustomerServer() { Customer[] a = new Customer[30]; try { // Create a server socket ServerSocket serverSocket = new ServerSocket(8000); System.out.println("Server started "); // Create an object ouput stream outputToFile = new ObjectOutputStream( new FileOutputStream("student.dat", true)); while (true) { // Listen for a new connection request Socket socket = serverSocket.accept(); // Create an input stream from the socket inputFromClient = new ObjectInputStream(socket.getInputStream()); // Read from input //Object object = inputFromClient.readObject(); for (int k = 0; k <= 2; k++) { if (a[k] == null) { a[k] = (Customer) inputFromClient.readObject(); // Write to the file outputToFile.writeObject(a[k]); //System.out.println("A new student object is stored"); System.out.println(a[k].getName()); break; } if (k == 2) { //fully booked outputToFile.writeObject("All seats are booked"); break; } } } } catch (ClassNotFoundException ex) { ex.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } finally { try { inputFromClient.close(); outputToFile.close(); } catch (Exception ex) { ex.printStackTrace(); } } } } Customer.java public class Customer implements java.io.Serializable { private String name; private String seatno; public Customer(String name, String seatno) { this.name = name; this.seatno = seatno; } public String getName() { return name; } public String getSeatNo() { return seatno; } }

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