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  • The balance between client and server functionality

    - by Eugen Martynov
    I want to bring the discussion that started in our teams and get your opinion about it. Assume we have an user account which could have different credentials for authentication and associated email to recover. An user has possibility to do signup with an email or use his social profile to complete signup process. As an Rest API from the backend to client looks like: Create account Authorise Update user data Link social account Register email Verify email In addition our BE is distributed and divided between several services/servers/clusters. So different calls are related to different end points. In case of the social sign up some of steps should be skipped or simplified. For example, with Facebook signup we could already skip email registration and verification step (we ask email permission form user), linking the social account and pre-fill user displayed name. So we proposed to have another end point which will hide/combine different calls on BE and return whole process result to the clients. The pros for this approach: No more duplication of functionality between clients Speed up the networking and user experience The cons for this approach: Additional work for backend Probably most complex scenarios in future updates I would like to get your opinion or experience with this situation. Especially if you already experienced point #2 from against reasons.

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  • Can not execute Sonar

    - by senzacionale
    my pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>RCC</groupId> <artifactId>tmp</artifactId> <name>tmp</name> <version>1.0</version> <build> <sourceDirectory>C:\Projekti\KIS\Model\src </sourceDirectory> <outputDirectory>C:\Projekti\KIS\Model\classes</outputDirectory> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.5</source> <target>1.5</target> <excludes> <exclude>**/*.*</exclude> </excludes> </configuration> </plugin> </plugins> </build> <properties> <sonar.dynamicAnalysis>false</sonar.dynamicAnalysis> </properties> </project> running sonnar C:\Projekti\Metrics>mvn sonar:sonar -e + Error stacktraces are turned on. [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'sonar'. [INFO] ------------------------------------------------------------------------ [INFO] Building tmp [INFO] task-segment: [sonar:sonar] (aggregator-style) [INFO] ------------------------------------------------------------------------ [INFO] [sonar:sonar {execution: default-cli}] [INFO] Sonar host: http://localhost:9000 [INFO] Sonar version: 2.1.2 [INFO] [sonar-core:internal {execution: default-internal}] [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Can not execute Sonar Embedded error: Can not analyze the project org.apache.derby.jdbc.ClientDriver [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: Can not execute Sonar at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:284) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138) at org.apache.maven.cli.MavenCli.main(MavenCli.java:362) at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60) 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:585) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) Caused by: org.apache.maven.plugin.MojoExecutionException: Can not execute Sonar at org.codehaus.mojo.sonar.Bootstraper.executeMojo(Bootstraper.java:87) at org.codehaus.mojo.sonar.Bootstraper.start(Bootstraper.java:65) at org.codehaus.mojo.sonar.SonarMojo.execute(SonarMojo.java:117) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694) ... 17 more Caused by: org.apache.maven.plugin.MojoExecutionException: Can not analyze the project at org.sonar.maven2.BatchMojo.executeBatch(BatchMojo.java:152) at org.sonar.maven2.BatchMojo.execute(BatchMojo.java:131) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490) at org.codehaus.mojo.sonar.Bootstraper.executeMojo(Bootstraper.java:82) ... 21 more Caused by: org.picocontainer.PicoLifecycleException: PicoLifecycleException: method 'public void org.sonar.api.database.AbstractDatabaseConnector.start()', instance 'org.sonar.api.database.DriverDatabaseConnector@c87621, java.lang.RuntimeException: wrapper at org.picocontainer.monitors.NullComponentMonitor.lifecycleInvocationFailed(NullComponentMonitor.java:77) at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.monitorAndThrowReflectionLifecycleException(ReflectionLifecycleStrategy.java:132) at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.invokeMethod(ReflectionLifecycleStrategy.java:115) at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.start(ReflectionLifecycleStrategy.java:89) at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.start(AbstractInjectionFactory.java:84) at org.picocontainer.behaviors.AbstractBehavior.start(AbstractBehavior.java:169) at org.picocontainer.behaviors.Stored$RealComponentLifecycle.start(Stored.java:132) at org.picocontainer.behaviors.Stored.start(Stored.java:110) at org.picocontainer.DefaultPicoContainer.potentiallyStartAdapter(DefaultPicoContainer.java:996) at org.picocontainer.DefaultPicoContainer.startAdapters(DefaultPicoContainer.java:989) at org.picocontainer.DefaultPicoContainer.start(DefaultPicoContainer.java:746) at org.sonar.batch.AggregatorBatch.execute(AggregatorBatch.java:84) at org.sonar.maven2.BatchMojo.executeBatch(BatchMojo.java:149) ... 24 more Caused by: java.lang.RuntimeException: wrapper at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.monitorAndThrowReflectionLifecycleException(ReflectionLifecycleStrategy.java:130) ... 35 more Caused by: org.sonar.api.database.DatabaseException: Cannot open connection to database: SQL driver not found org.apache.derby.jdbc.ClientDriver at org.sonar.api.database.AbstractDatabaseConnector.testConnection(AbstractDatabaseConnector.java:182) at org.sonar.api.database.AbstractDatabaseConnector.start(AbstractDatabaseConnector.java:94) 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:585) at org.picocontainer.lifecycle.ReflectionLifecycleStrategy.invokeMethod(ReflectionLifecycleStrategy.java:110) ... 34 more Caused by: java.sql.SQLException: SQL driver not found org.apache.derby.jdbc.ClientDriver at org.sonar.api.database.DriverDatabaseConnector.getConnection(DriverDatabaseConnector.java:70) at org.sonar.api.database.AbstractDatabaseConnector.testConnection(AbstractDatabaseConnector.java:178) ... 40 more Caused by: java.lang.ClassNotFoundException: org.apache.derby.jdbc.ClientDriver at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at org.codehaus.classworlds.RealmClassLoader.loadClassDirect(RealmClassLoader.java:195) at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:255) at org.codehaus.classworlds.DefaultClassRealm.loadClass(DefaultClassRealm.java:274) at org.codehaus.classworlds.RealmClassLoader.loadClass(RealmClassLoader.java:214) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:164) at org.sonar.api.database.DriverDatabaseConnector.getConnection(DriverDatabaseConnector.java:68) ... 41 more [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3 seconds [INFO] Finished at: Wed Jun 09 12:12:55 CEST 2010 [INFO] Final Memory: 12M/23M [INFO] ------------------------------------------------------------------------ any idea why not working Sonar with maven?

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  • How to use java ee 6 @Resource annotation

    - by javamonkey79
    The java ee 6 api has an annotation @Resource with an attribute 'lookup', however, so does the java se 6 api (here). However, since java ee 6 is dependent on java se 6, it seems you can not get at the ee version of the annotation and the 'lookup' attribute. Is this a bug or is there some other way to use this annotation that I am missing. TIA

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  • Eclipselink problem in a javase project

    - by arinte
    I am getting this error when I am running my eclipselink project. [EL Warning]: 2008.12.05 11:47:08.056--java.lang.NoClassDefFoundError: org/jboss/resource/adapter/jdbc/ValidConnectionChecker was thrown on attempt of PersistenceLoadProcessor to load class com.mysql.jdbc.integration.jboss.MysqlValidConnectionChecker. The class is ignored. Exception in thread "main" java.lang.NoClassDefFoundError: org/jboss/resource/adapter/jdbc/ValidConnectionChecker at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$000(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.loadClass(PersistenceUnitProcessor.java:261) at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.initPersistenceUnitClasses(MetadataProcessor.java:247) at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processEntityMappings(MetadataProcessor.java:422) at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:299) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:830) at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:101) at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.initPersistenceUnits(JPAInitializer.java:149) at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.initialize(JPAInitializer.java:135) at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:104) at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:64) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60) at Main.main(Main.java:32) Caused by: java.lang.ClassNotFoundException: org.jboss.resource.adapter.jdbc.ValidConnectionChecker at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) ... 24 more Any ideas? Why would eclipselink need something from jboss? What jboss jar do I need. I would use open jpa, but for some reason after quit a few persists from my app it starts giving a bunch of stackoverflow errors.

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  • How to solve "java.io.IOException: error=12, Cannot allocate memory" calling Runtime#exec()?

    - by Andrea Francia
    On my system I can't run a simple Java application that start a process. I don't know how to solve. Could you give me some hints how to solve? The program is: [root@newton sisma-acquirer]# cat prova.java import java.io.IOException; public class prova { public static void main(String[] args) throws IOException { Runtime.getRuntime().exec("ls"); } } The result is: [root@newton sisma-acquirer]# javac prova.java && java -cp . prova Exception in thread "main" java.io.IOException: Cannot run program "ls": java.io.IOException: error=12, Cannot allocate memory at java.lang.ProcessBuilder.start(ProcessBuilder.java:474) at java.lang.Runtime.exec(Runtime.java:610) at java.lang.Runtime.exec(Runtime.java:448) at java.lang.Runtime.exec(Runtime.java:345) at prova.main(prova.java:6) Caused by: java.io.IOException: java.io.IOException: error=12, Cannot allocate memory at java.lang.UNIXProcess.<init>(UNIXProcess.java:164) at java.lang.ProcessImpl.start(ProcessImpl.java:81) at java.lang.ProcessBuilder.start(ProcessBuilder.java:467) ... 4 more Configuration of the system: [root@newton sisma-acquirer]# java -version java version "1.6.0_0" OpenJDK Runtime Environment (IcedTea6 1.5) (fedora-18.b16.fc10-i386) OpenJDK Client VM (build 14.0-b15, mixed mode) [root@newton sisma-acquirer]# cat /etc/fedora-release Fedora release 10 (Cambridge) EDIT: Solution This solves my problem, I don't know exactly why: echo 0 /proc/sys/vm/overcommit_memory Up-votes for who is able to explain :) Additional informations, top output: top - 13:35:38 up 40 min, 2 users, load average: 0.43, 0.19, 0.12 Tasks: 129 total, 1 running, 128 sleeping, 0 stopped, 0 zombie Cpu(s): 1.5%us, 0.5%sy, 0.0%ni, 94.8%id, 3.2%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1033456k total, 587672k used, 445784k free, 51672k buffers Swap: 2031608k total, 0k used, 2031608k free, 188108k cached Additional informations, free output: [root@newton sisma-acquirer]# free total used free shared buffers cached Mem: 1033456 588548 444908 0 51704 188292 -/+ buffers/cache: 348552 684904 Swap: 2031608 0 2031608

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  • BufferedReader.readLine() gives error java.net.SocketException: Software caused connection abort: re

    - by javatcp
    I am trying to code my program such that until the buffered reader gets something in readLine() from my tcp client it should keep running in the while loop checking but I get this error as soon as the program executes Mar 31, 2010 11:03:36 PM deswash.DESWashView$5 run SEVERE: null java.net.SocketException: Software caused connection abort: recv failed at java.net.SocketInputStream.socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:129) at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264) at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306) at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158) at java.io.InputStreamReader.read(InputStreamReader.java:167) at java.io.BufferedReader.fill(BufferedReader.java:136) at java.io.BufferedReader.readLine(BufferedReader.java:299) at java.io.BufferedReader.readLine(BufferedReader.java:362) at deswash.DESWashView$5.run(DESWashView.java:448) the second line in the following code throws the error while(running){ String temp = in.readLine(); if(!(temp.equals(null))){ int inid = Integer.parseInt(temp); stationList.add(inid); } }

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  • Java Applet in Firefox

    - by prakash
    Hi All, I am facing a weird problem in Testing server while using applet (using embed tag) in my ASP.NET MVC application Applet works fine locally in both browsers IE and Firefox but when deployed to Testing server its throwing below exception for Firefox only (IE works fine). Please help me out in this basic: exception: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found. java.lang.RuntimeException: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found at javax.xml.parsers.DocumentBuilderFactory.newInstance(Unknown Source) at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:772) at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:696) at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471) at org.apache.log4j.LogManager.<clinit>(LogManager.java:125) at org.apache.log4j.Logger.getLogger(Logger.java:105) at com.goldleaf.scanner.Logger.<init>(Unknown Source) at com.goldleaf.scanner.Logger.<init>(Unknown Source) at com.goldleaf.scanner.Logger$LoggerHolder.<clinit>(Unknown Source) at com.goldleaf.scanner.Logger.getInstance(Unknown Source) at com.goldleaf.scanner.ScannerApplet.<init>(Unknown Source) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at sun.plugin2.applet.Plugin2Manager$12.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(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) Exception: java.lang.RuntimeException: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found Ignored exception: java.lang.RuntimeException: javax.xml.parsers.FactoryConfigurationError: Provider <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> not found basic: Starting applet teardown basic: Finished applet teardown

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  • java.lang.IllegalAccessError in Windows xp

    - by Priya.S
    Hi I have installed NetBeens 6.9.1 in my windows xp system. java web application wokring fine. But i have not get web method in my java web application. its error occurring. Error Message : init: deps-module-jar: deps-ear-jar: deps-jar: wsimport-init: Created dir: D:\javaprg\projects\myApp\build\generated-sources\jax-ws wsimport-client-userServiceService: Created dir: D:\javaprg\projects\myApp\build\generated\jax-wsCache\userServiceService D:\javaprg\projects\myApp\nbproject\jaxws-build.xml:31: java.lang.IllegalAccessError: tried to access class com.sun.tools.ws.Invoker from class com.sun.tools.ws.ant.WrapperTask at com.sun.tools.ws.ant.WrapperTask.createClassLoader(WrapperTask.java:85) at com.sun.istack.tools.ProtectedTask.execute(ProtectedTask.java:46) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) at sun.reflect.GeneratedMethodAccessor139.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:589) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:390) at org.apache.tools.ant.Target.performTasks(Target.java:411) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1397) at org.apache.tools.ant.Project.executeTarget(Project.java:1366) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1249) at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:281) at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:539) at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:154) BUILD FAILED (total time: 1 second)

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  • Java Play Mustache NPE Error

    - by zanedev
    We are getting a mustache play error in production (amazon linux EC2 AMI) but not in development (MACs) and we have tried upgrading the jvm, using the jdk instead, and changing from a tomcat deploy model to match our development environments as much as possible but nothing is working. Please any help would be greatly appreciated. We have lots of shared code in java and javascript using mustache and it would be a big deal to rewrite everything if we had to ditch mustache on the java side. 20:48:52,403 ERROR ~ @6al2dd0po Internal Server Error (500) for request GET /mystuff/people Execution exception (In {module:mustache-0.2}/app/play/modules/mustache/MustacheTags.java around line 32) NullPointerException occured : null play.exceptions.JavaExecutionException at play.templates.BaseTemplate.throwException(BaseTemplate.java:90) at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:257) at play.templates.Template.render(Template.java:26) at play.templates.GroovyTemplate.render(GroovyTemplate.java:187) at play.mvc.results.RenderTemplate.<init>(RenderTemplate.java:24) at play.mvc.Controller.renderTemplate(Controller.java:660) at play.mvc.Controller.renderTemplate(Controller.java:640) at play.mvc.Controller.render(Controller.java:695) at controllers.MyStuff.people(MyStuff.java:183) at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:548) at play.mvc.ActionInvoker.invoke(ActionInvoker.java:502) at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:478) at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:473) at play.mvc.ActionInvoker.invoke(ActionInvoker.java:161) at Invocation.HTTP Request(Play!) Caused by: java.lang.NullPointerException at play.modules.mustache.MustacheTags._template(MustacheTags.java:32) at play.modules.mustache.MustacheTags$_template.call(Unknown Source) at /app/views/User/people.html.(line:22) at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:232) ... 13 more

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  • Call java program on server through web request

    - by Rossella
    I need to develop an application where a Java client calls a Java application located on the server with certain parameters, the Java application on the server computes data and sends the data back to the client. Everything needs to go through port 80 on which I have a IIS webserver listening. I cannot open any other port on the server. Is there any way I can do this? The server can write files in a directory that the client can read but I am not sure how to handle the synchronization and I don't know how to call a script on the server from the client through port 80. Every suggestion would be highly appreciated Thanks a lot in advance, this problem is making me crazy

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  • How can I write byte[] to socket outputstream and specify the end of file?

    - by Christopher Francisco
    I've googled 2 days straight and I can't find how to do this. I have an open stream between client and server, and client will send a JSON string (encrypted to bytes) to the server each 3 to 5 seconds. How can I write to the Socket OutputStream so that I can read each JSON string in the server. I'm guessing I need to specify some kind of end of file or something, but can't find any info on how to achieve this.

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  • JRuby wrong element type class java.lang.String(array contains char) related to JAVA_HOME

    - by Daryl
    I am on Ubuntu x64 bit running: java version "1.6.0_18" OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-0ubuntu1) OpenJDK 64-Bit Server VM (build 14.0-b16, mixed mode) and jruby 1.4.0 (ruby 1.8.7 patchlevel 174) (2010-02-11 6586) (OpenJDK 64-Bit Server VM 1.6.0_18) [amd64-java] I have this code running on my Windows 7 computer at home. I recently copied over my whole folder over to Ubuntu, installed java, jruby, and associated gems but I get this error when I run my main file: jruby run.rb test =================Processing FREDERICKSBURG_1.1======================= ERROR IN TESTING wrong element type class java.lang.String(array contains char) /home/daryl/Desktop/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `to_java' /home/daryl/Desktop/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `split' /home/daryl/Desktop/work/Code/geografikos/lib/models/page.rb:103:in `sentences' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/lingpipe_svm.rb:34:in `extract' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:9:in `process' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `each' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `process' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `each' /home/daryl/Desktop/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `process' /home/daryl/Desktop/work/Code/geografikos/lib/statistics.rb:111:in `generate_all' /home/daryl/Desktop/work/Code/geografikos/lib/statistics.rb:105:in `each' /home/daryl/Desktop/work/Code/geografikos/lib/statistics.rb:105:in `generate_all' run.rb:56 The focus of the error is: ERROR IN TESTING wrong element type class java.lang.String(array contains char) Everything works fine on my windows machine. I figured I was getting this error because I did not have JAVA_HOME set however I added this to bashrc as: export JAVA_HOME=/usr/lib/jvm/java-1.6.0-openjdk and have confirmed: echo $JAVA_HOME /usr/lib/jvm/java-1.6.0-openjdk I can produce a similar error by removing my JAVA_HOME variable on windows: =================Processing FREDERICKSBURG_1.3======================= ERROR IN TESTING cannot convert instance of class org.jruby.RubyString to char C:/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `to_java' C:/work/Code/geografikos/lib/sentence_splitter/splitter.rb:21:in `split' C:/work/Code/geografikos/lib/models/page.rb:103:in `sentences' C:/work/Code/geografikos/lib/extractor/lingpipe_svm.rb:34:in `extract' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:9:in `process' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `each' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:8:in `process' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `each' C:/work/Code/geografikos/lib/extractor/geo_controller.rb:6:in `process' C:/work/Code/geografikos/lib/statistics.rb:111:in `generate_all' C:/work/Code/geografikos/lib/statistics.rb:105:in `each' C:/work/Code/geografikos/lib/statistics.rb:105:in `generate_all' run.rb:56 It is obviously not exactly the same but I have a feeling this has to do with the java path. You can probably derive from the error that I am just trying to convert a ruby variable to java using to_java. This works fine on my windows machine and I have confirmed the gems are the same but I don't think this has to do with gems. I lied. I changed my JAVA_HOME back on my windows machine and this error still occurs. So now the code doesn't run on either machine. I recently installed git on my windows machine and added the code to a repository. But I haven't really done anything with it. All it said was it will convert all LF to CRLF...That shouldn't change anything though should it? Any ideas on why I am now getting these errors? I haven't changed anything on my windows machine in months except for installing git.

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  • Why is Java .Net so slow? [closed]

    - by 0101
    Ive just tried to use atmosphere.java.net (to see what it is) and I am not able to do it. Why is Java .NET so slow? Is it because they used Java in the server and are as incompetent as people whom write questions for SCJP? Does Sun have any competent employee and have you ever saw one ? (except the guy from Java Puzzles who made a career, because he made a lot of mistakes in Java API and now can teach us about it.) P.S. I would make it the "community wiki" if I could(to not get massive down-votes) but its not possible here, so hit me if you want to.

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  • Why is Python slower than Java but faster than PHP

    - by good_computer
    I have many times seen various benchmarks that show how a bunch of languages perform on a given task. Always these benchmarks reveal that Python is slower then Java and faster than PHP. And I wonder why is that the case. Java, Python, and PHP run inside a virtual machine All three languages convert their programs into their custom byte codes that run on top of OS -- so none is running natively Both Java and Python can be "complied" (.pyc for Python) but the __main__ module for Python is not compiled Python and PHP are dynamically typed and Java statically -- is this the reason Java is faster, and if so, please explain how that affects speed. And, even if the dynamic-vs-static argument is correct, this does not explain why PHP is slower than Python -- because both are dynamic languages. You can see some benchmarks here and here, and here

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  • JavaOne 2012 - Java Deployment on Mac OS X

    - by Sharon Zakhour
    Also at the JavaOne 2012 conference, Scott Kovatch presented a session on Deploying Your Application with OpenJDK 7 on Mac OS X. The session had special emphasis on how to deploy Java applications to the Mac App Store and discussed topics relevant to using Oracle Java on the Mac. Interested developers may find the following documentation useful: Packaging a Java App for Distribution on a Mac. For more information on installing and using Oracle Java for the Mac, refer to the following documentation: Mac FAQ JDK 7 Installation for Mac OS X JRE 7 Installation for Mac OS X Mac OS X Platform Install FAQ Note for Users of Macs that Include Apple Java 6

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  • Goto for the Java Programming Language

    - by darcy
    Work on JDK 8 is well-underway, but we thought this late-breaking JEP for another language change for the platform couldn't wait another day before being published. Title: Goto for the Java Programming Language Author: Joseph D. Darcy Organization: Oracle. Created: 2012/04/01 Type: Feature State: Funded Exposure: Open Component: core/lang Scope: SE JSR: 901 MR Discussion: compiler dash dev at openjdk dot java dot net Start: 2012/Q2 Effort: XS Duration: S Template: 1.0 Reviewed-by: Duke Endorsed-by: Edsger Dijkstra Funded-by: Blue Sun Corporation Summary Provide the benefits of the time-testing goto control structure to Java programs. The Java language has a history of adding new control structures over time, the assert statement in 1.4, the enhanced for-loop in 1.5,and try-with-resources in 7. Having support for goto is long-overdue and simple to implement since the JVM already has goto instructions. Success Metrics The goto statement will allow inefficient and verbose recursive algorithms and explicit loops to be replaced with more compact code. The effort will be a success if at least twenty five percent of the JDK's explicit loops are replaced with goto's. Coordination with IDE vendors is expected to help facilitate this goal. Motivation The goto construct offers numerous benefits to the Java platform, from increased expressiveness, to more compact code, to providing new programming paradigms to appeal to a broader demographic. In JDK 8, there is a renewed focus on using the Java platform on embedded devices with more modest resources than desktop or server environments. In such contexts, static and dynamic memory footprint is a concern. One significant component of footprint is the code attribute of class files and certain classes of important algorithms can be expressed more compactly using goto than using other constructs, saving footprint. For example, to implement state machines recursively, some parties have asked for the JVM to support tail calls, that is, to perform a complex transformation with security implications to turn a method call into a goto. Such complicated machinery should not be assumed for an embedded context. A better solution is just to expose to the programmer the desired functionality, goto. The web has familiarized users with a model of traversing links among different HTML pages in a free-form fashion with some state being maintained on the side, such as login credentials, to effect behavior. This is exactly the programming model of goto and code. While in the past this has been derided as leading to "spaghetti code," spaghetti is a tasty and nutritious meal for programmers, unlike quiche. The invokedynamic instruction added by JSR 292 exposes the JVM's linkage operation to programmers. This is a low-level operation that can be leveraged by sophisticated programmers. Likewise, goto is a also a low-level operation that should not be hidden from programmers who can use more efficient idioms. Some may object that goto was consciously excluded from the original design of Java as one of the removed feature from C and C++. However, the designers of the Java programming languages have revisited these removals before. The enum construct was also left out only to be added in JDK 5 and multiple inheritance was left out, only to be added back by the virtual extension method methods of Project Lambda. As a living language, the needs of the growing Java community today should be used to judge what features are needed in the platform tomorrow; the language should not be forever bound by the decisions of the past. Description From its initial version, the JVM has had two instructions for unconditional transfer of control within a method, goto (0xa7) and goto_w (0xc8). The goto_w instruction is used for larger jumps. All versions of the Java language have supported labeled statements; however, only the break and continue statements were able to specify a particular label as a target with the onerous restriction that the label must be lexically enclosing. The grammar addition for the goto statement is: GotoStatement: goto Identifier ; The new goto statement similar to break except that the target label can be anywhere inside the method and the identifier is mandatory. The compiler simply translates the goto statement into one of the JVM goto instructions targeting the right offset in the method. Therefore, adding the goto statement to the platform is only a small effort since existing compiler and JVM functionality is reused. Other language changes to support goto include obvious updates to definite assignment analysis, reachability analysis, and exception analysis. Possible future extensions include a computed goto as found in gcc, which would replace the identifier in the goto statement with an expression having the type of a label. Testing Since goto will be implemented using largely existing facilities, only light levels of testing are needed. Impact Compatibility: Since goto is already a keyword, there are no source compatibility implications. Performance/scalability: Performance will improve with more compact code. JVMs already need to handle irreducible flow graphs since goto is a VM instruction.

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  • Free Java Workshops at Mobile World Congress

    - by Jacob Lehrbaum
    Are you attending Mobile World Congress in Barcelona next week? If so, you might want to register for Oracle's free workshop series taking place in the App Planet. We will be hosting a series of 25 workshops in our booth covering a range of topics that include: Benefits of Deploying Phones with Oracle Java Wireless Client Oracle's Embedded Java solutions for Machine-to-Machine applications Building better User Interfaces with the Lightweight User Interface Toolkit Resources to help you leverage Operator Network APIs in your Applications The Java Verified Program: new trusted status and other recent initiatives Building better mobile enterprise applications with Oracle's ADF Mobile technology How to build a profitable mobile applications business with Java ME Guest speakers from Orange, Telefonica and from leading ISVs REGISTER NOW for one or more workshops in the Oracle Java Booth 7C18 located in the App Planet. Oh, and did we mention there might be giveaways? Note: you may need to "sign out" if you have an account on Oracle.com in order to see the registration page

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  • Starting java processes with Upstart

    - by user265330
    I want to start a java process using Upstart. Currently, on our OpenSuSE servers, I use the System V init system to achieve this, but on our Ubuntu servers I'd rather use Upstart. But I have two questions... I have an Upstart job (a task) that configures the server, called, say, myconfig. And in the job that starts my java processes I ostensibly have: start on stopped myconfig exec /path/to/myjavastartscript.sh myjavastartscript.sh runs 'java -classpath blah MyClass'. In System V init, starting the service runs 'nohup /path/to/myjavastartscript.sh &'. So my first question is whether I still need to do the nohup or run-in-background with the exec command? When running, MyClass starts other Java processes. In System V init, the service stop just looks for java processes owned by a certain user and kills them. My second question is how could I control the termination of these processes with Upstart?

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  • ARM TechCON 2013 presentation: Java SE 8 Compact Profiles

    - by hinkmond
    I'll be giving a technical session presentation at ARM TechCON 2013 this Wed. 10/30 @ 11:30am. So if you are in Santa Clara, Calif. come over to the conference and hear me present on this fun-filled topic! See: Java SE 8 Compact Profiles Here's a quote: Java SE 8 has a new Compact Profiles feature that allows for three new specification–compliant subsets of Java SE 8 APIs. Compact Profiles will enable the creation of Java SE 8 runtimes that support configurations that previously were possible only with the CDC version of J2ME... It's an important topic in today's mad, mad world of Embedded Development. You never want to develop in Java for small devices with your Compact Profiles. It's just not what you'd want! Hinkmond

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  • Impact of changing from PHP to Java after 1 year or 6 months

    - by user62909
    I'm MCA final year student and I have very poor school record and had 2 years of gap. I'm first class with distinction in graduation and in post graduation is first class.Companies are coming for campus recruitment.I have very less companies like 4 or 5 who don't impose any criteria. there is a company who work on PHP and i have cleared its aptitude test and technical only HR remaining. I'm actually interested in Java and have knowledge about it but company work on PHP.I was fretting about If i work on PHP for 6 or 1 year can I change later to Java ? because i will also have experience of 6 or 12 months ? Will be considered an experienced employee if I apply for java developer later ? Will manager think that I worked in PHP and not allowed for Java ? Will I have to pursue java OCJP certification so i can get job even after 1 year experience of PHP ? Only 8 days are remaining for Hr round so please need help

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  • Should your client be able to view your project management board?

    - by bizso09
    We're making a bespoke software for our client and use Codebase for our project management. Is it a good idea to let our client view our project management board? The advantages that we thought of are that this would enhance the cooperation between the client and the dev team, following agile practices. He would essentially become part of our team. It would also reduce communication overhead and make sure we're on the same page. The client could track the progression of the system and make suggestions along the way on the user stories. In addition, he could submit bugs or feature requests. The disadvantages that we though of are that some aspects of the board might be too technical to the client. He would suggest changes to the user stories too often and he might view some content that we normally wouldn't want our client to see. For example, when we compromise on technology or functionality, the client might question that and insist on doing things one way or the other.

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  • On-demand Webcast: Java in the Smart Grid

    - by Jacob Lehrbaum
    The Smart Grid is one of the most significant evolutions of our utility infrastructure in recent history. This innovative grid will soon revolutionize how utilities manage and control the energy in our homes--helping utilities reduce energy usage during peak hours, improve overall energy efficiency, and lower your energy bills. If you'd like to learn more about the Smart Grid and the role that Java is poised to play in this important initiative you can check out our on-demand webcast. We'll show you how Java solutions--including Java ME and Java SE for Embedded --can help build devices and infrastructure that take advantage of this new market. As the world's most popular developer language, Java enables you to work with a wide range of developers and provides access to tools and resources to build smarter devices, faster and more affordably.

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  • Look after your tribe of Pygmies with Java ME technology

    - by hinkmond
    Here's a game that is crossing over from the iDrone to the more lucrative Java ME cell phone market. See: Pocket God on Java ME Here's a quote: Massive casual iPhone hit Pocket God has parted the format waves and walked over to the land of Java mobiles, courtesy of AMA. The game sees you take control of an omnipotent, omnipresent, and (possibly) naughty deity, looking after your tribe of Pygmies... Everyone knows that there are more Java ME feature phones than grains of sand on a Pocket God island beach. So, when iDrone games are done piddlying around on a lesser platform, they move over to Java ME where things are really happening. Hinkmond

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  • Pros and cons of developing modern services in Java

    - by r3mus
    I'm interested in the philosophical and architectural justification (or lack thereof) in using Java to develop in today's modern world (exclude mobile/embedded platforms of course). Why would one choose to develop (or not develop) a back-end in Java? Why would one choose to develop (or not develop) a front-end UI in Java? Why do large enterprises lean towards developing in Java rather than adopt more modern (and standardized) technologies? *disclaimer: I'm not a fan of Java in the enterprise, I'm simply curious what drives enterprises to continue the trend.

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