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  • How to simulate inner join on very large files in java (without running out of memory)

    - by Constantin
    I am trying to simulate SQL joins using java and very large text files (INNER, RIGHT OUTER and LEFT OUTER). The files have already been sorted using an external sort routine. The issue I have is I am trying to find the most efficient way to deal with the INNER join part of the algorithm. Right now I am using two Lists to store the lines that have the same key and iterate through the set of lines in the right file once for every line in the left file (provided the keys still match). In other words, the join key is not unique in each file so would need to account for the Cartesian product situations ... left_01, 1 left_02, 1 right_01, 1 right_02, 1 right_03, 1 left_01 joins to right_01 using key 1 left_01 joins to right_02 using key 1 left_01 joins to right_03 using key 1 left_02 joins to right_01 using key 1 left_02 joins to right_02 using key 1 left_02 joins to right_03 using key 1 My concern is one of memory. I will run out of memory if i use the approach below but still want the inner join part to work fairly quickly. What is the best approach to deal with the INNER join part keeping in mind that these files may potentially be huge public class Joiner { private void join(BufferedReader left, BufferedReader right, BufferedWriter output) throws Throwable { BufferedReader _left = left; BufferedReader _right = right; BufferedWriter _output = output; Record _leftRecord; Record _rightRecord; _leftRecord = read(_left); _rightRecord = read(_right); while( _leftRecord != null && _rightRecord != null ) { if( _leftRecord.getKey() < _rightRecord.getKey() ) { write(_output, _leftRecord, null); _leftRecord = read(_left); } else if( _leftRecord.getKey() > _rightRecord.getKey() ) { write(_output, null, _rightRecord); _rightRecord = read(_right); } else { List<Record> leftList = new ArrayList<Record>(); List<Record> rightList = new ArrayList<Record>(); _leftRecord = readRecords(leftList, _leftRecord, _left); _rightRecord = readRecords(rightList, _rightRecord, _right); for( Record equalKeyLeftRecord : leftList ){ for( Record equalKeyRightRecord : rightList ){ write(_output, equalKeyLeftRecord, equalKeyRightRecord); } } } } if( _leftRecord != null ) { write(_output, _leftRecord, null); _leftRecord = read(_left); while(_leftRecord != null) { write(_output, _leftRecord, null); _leftRecord = read(_left); } } else { if( _rightRecord != null ) { write(_output, null, _rightRecord); _rightRecord = read(_right); while(_rightRecord != null) { write(_output, null, _rightRecord); _rightRecord = read(_right); } } } _left.close(); _right.close(); _output.flush(); _output.close(); } private Record read(BufferedReader reader) throws Throwable { Record record = null; String data = reader.readLine(); if( data != null ) { record = new Record(data.split("\t")); } return record; } private Record readRecords(List<Record> list, Record record, BufferedReader reader) throws Throwable { int key = record.getKey(); list.add(record); record = read(reader); while( record != null && record.getKey() == key) { list.add(record); record = read(reader); } return record; } private void write(BufferedWriter writer, Record left, Record right) throws Throwable { String leftKey = (left == null ? "null" : Integer.toString(left.getKey())); String leftData = (left == null ? "null" : left.getData()); String rightKey = (right == null ? "null" : Integer.toString(right.getKey())); String rightData = (right == null ? "null" : right.getData()); writer.write("[" + leftKey + "][" + leftData + "][" + rightKey + "][" + rightData + "]\n"); } public static void main(String[] args) { try { BufferedReader leftReader = new BufferedReader(new FileReader("LEFT.DAT")); BufferedReader rightReader = new BufferedReader(new FileReader("RIGHT.DAT")); BufferedWriter output = new BufferedWriter(new FileWriter("OUTPUT.DAT")); Joiner joiner = new Joiner(); joiner.join(leftReader, rightReader, output); } catch (Throwable e) { e.printStackTrace(); } } } After applying the ideas from the proposed answer, I changed the loop to this private void join(RandomAccessFile left, RandomAccessFile right, BufferedWriter output) throws Throwable { long _pointer = 0; RandomAccessFile _left = left; RandomAccessFile _right = right; BufferedWriter _output = output; Record _leftRecord; Record _rightRecord; _leftRecord = read(_left); _rightRecord = read(_right); while( _leftRecord != null && _rightRecord != null ) { if( _leftRecord.getKey() < _rightRecord.getKey() ) { write(_output, _leftRecord, null); _leftRecord = read(_left); } else if( _leftRecord.getKey() > _rightRecord.getKey() ) { write(_output, null, _rightRecord); _pointer = _right.getFilePointer(); _rightRecord = read(_right); } else { long _tempPointer = 0; int key = _leftRecord.getKey(); while( _leftRecord != null && _leftRecord.getKey() == key ) { _right.seek(_pointer); _rightRecord = read(_right); while( _rightRecord != null && _rightRecord.getKey() == key ) { write(_output, _leftRecord, _rightRecord ); _tempPointer = _right.getFilePointer(); _rightRecord = read(_right); } _leftRecord = read(_left); } _pointer = _tempPointer; } } if( _leftRecord != null ) { write(_output, _leftRecord, null); _leftRecord = read(_left); while(_leftRecord != null) { write(_output, _leftRecord, null); _leftRecord = read(_left); } } else { if( _rightRecord != null ) { write(_output, null, _rightRecord); _rightRecord = read(_right); while(_rightRecord != null) { write(_output, null, _rightRecord); _rightRecord = read(_right); } } } _left.close(); _right.close(); _output.flush(); _output.close(); } UPDATE While this approach worked, it was terribly slow and so I have modified this to create files as buffers and this works very well. Here is the update ... private long getMaxBufferedLines(File file) throws Throwable { long freeBytes = Runtime.getRuntime().freeMemory() / 2; return (freeBytes / (file.length() / getLineCount(file))); } private void join(File left, File right, File output, JoinType joinType) throws Throwable { BufferedReader leftFile = new BufferedReader(new FileReader(left)); BufferedReader rightFile = new BufferedReader(new FileReader(right)); BufferedWriter outputFile = new BufferedWriter(new FileWriter(output)); long maxBufferedLines = getMaxBufferedLines(right); Record leftRecord; Record rightRecord; leftRecord = read(leftFile); rightRecord = read(rightFile); while( leftRecord != null && rightRecord != null ) { if( leftRecord.getKey().compareTo(rightRecord.getKey()) < 0) { if( joinType == JoinType.LeftOuterJoin || joinType == JoinType.LeftExclusiveJoin || joinType == JoinType.FullExclusiveJoin || joinType == JoinType.FullOuterJoin ) { write(outputFile, leftRecord, null); } leftRecord = read(leftFile); } else if( leftRecord.getKey().compareTo(rightRecord.getKey()) > 0 ) { if( joinType == JoinType.RightOuterJoin || joinType == JoinType.RightExclusiveJoin || joinType == JoinType.FullExclusiveJoin || joinType == JoinType.FullOuterJoin ) { write(outputFile, null, rightRecord); } rightRecord = read(rightFile); } else if( leftRecord.getKey().compareTo(rightRecord.getKey()) == 0 ) { String key = leftRecord.getKey(); List<File> rightRecordFileList = new ArrayList<File>(); List<Record> rightRecordList = new ArrayList<Record>(); rightRecordList.add(rightRecord); rightRecord = consume(key, rightFile, rightRecordList, rightRecordFileList, maxBufferedLines); while( leftRecord != null && leftRecord.getKey().compareTo(key) == 0 ) { processRightRecords(outputFile, leftRecord, rightRecordFileList, rightRecordList, joinType); leftRecord = read(leftFile); } // need a dispose for deleting files in list } else { throw new Exception("DATA IS NOT SORTED"); } } if( leftRecord != null ) { if( joinType == JoinType.LeftOuterJoin || joinType == JoinType.LeftExclusiveJoin || joinType == JoinType.FullExclusiveJoin || joinType == JoinType.FullOuterJoin ) { write(outputFile, leftRecord, null); } leftRecord = read(leftFile); while(leftRecord != null) { if( joinType == JoinType.LeftOuterJoin || joinType == JoinType.LeftExclusiveJoin || joinType == JoinType.FullExclusiveJoin || joinType == JoinType.FullOuterJoin ) { write(outputFile, leftRecord, null); } leftRecord = read(leftFile); } } else { if( rightRecord != null ) { if( joinType == JoinType.RightOuterJoin || joinType == JoinType.RightExclusiveJoin || joinType == JoinType.FullExclusiveJoin || joinType == JoinType.FullOuterJoin ) { write(outputFile, null, rightRecord); } rightRecord = read(rightFile); while(rightRecord != null) { if( joinType == JoinType.RightOuterJoin || joinType == JoinType.RightExclusiveJoin || joinType == JoinType.FullExclusiveJoin || joinType == JoinType.FullOuterJoin ) { write(outputFile, null, rightRecord); } rightRecord = read(rightFile); } } } leftFile.close(); rightFile.close(); outputFile.flush(); outputFile.close(); } public void processRightRecords(BufferedWriter outputFile, Record leftRecord, List<File> rightFiles, List<Record> rightRecords, JoinType joinType) throws Throwable { for(File rightFile : rightFiles) { BufferedReader rightReader = new BufferedReader(new FileReader(rightFile)); Record rightRecord = read(rightReader); while(rightRecord != null){ if( joinType == JoinType.LeftOuterJoin || joinType == JoinType.RightOuterJoin || joinType == JoinType.FullOuterJoin || joinType == JoinType.InnerJoin ) { write(outputFile, leftRecord, rightRecord); } rightRecord = read(rightReader); } rightReader.close(); } for(Record rightRecord : rightRecords) { if( joinType == JoinType.LeftOuterJoin || joinType == JoinType.RightOuterJoin || joinType == JoinType.FullOuterJoin || joinType == JoinType.InnerJoin ) { write(outputFile, leftRecord, rightRecord); } } } /** * consume all records having key (either to a single list or multiple files) each file will * store a buffer full of data. The right record returned represents the outside flow (key is * already positioned to next one or null) so we can't use this record in below while loop or * within this block in general when comparing current key. The trick is to keep consuming * from a List. When it becomes empty, re-fill it from the next file until all files have * been consumed (and the last node in the list is read). The next outside iteration will be * ready to be processed (either it will be null or it points to the next biggest key * @throws Throwable * */ private Record consume(String key, BufferedReader reader, List<Record> records, List<File> files, long bufferMaxRecordLines ) throws Throwable { boolean processComplete = false; Record record = records.get(records.size() - 1); while(!processComplete){ long recordCount = records.size(); if( record.getKey().compareTo(key) == 0 ){ record = read(reader); while( record != null && record.getKey().compareTo(key) == 0 && recordCount < bufferMaxRecordLines ) { records.add(record); recordCount++; record = read(reader); } } processComplete = true; // if record is null, we are done if( record != null ) { // if the key has changed, we are done if( record.getKey().compareTo(key) == 0 ) { // Same key means we have exhausted the buffer. // Dump entire buffer into a file. The list of file // pointers will keep track of the files ... processComplete = false; dumpBufferToFile(records, files); records.clear(); records.add(record); } } } return record; } /** * Dump all records in List of Record objects to a file. Then, add that * file to List of File objects * * NEED TO PLACE A LIMIT ON NUMBER OF FILE POINTERS (check size of file list) * * @param records * @param files * @throws Throwable */ private void dumpBufferToFile(List<Record> records, List<File> files) throws Throwable { String prefix = "joiner_" + files.size() + 1; String suffix = ".dat"; File file = File.createTempFile(prefix, suffix, new File("cache")); BufferedWriter writer = new BufferedWriter(new FileWriter(file)); for( Record record : records ) { writer.write( record.dump() ); } files.add(file); writer.flush(); writer.close(); }

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  • EJB client can't find a DataSource that tests successfully in WebLogic admin console

    - by suszterpatt
    Disclaimer: I'm completely new to JEE/EJB and all that, so bear with me. I have a simple EJB that I can successfully deploy using JDeveloper 11g's integrated WebLogic server and a remote database connection (JDBC). I have a DataSource named "PGY2" defined in WebLogic, and I can test it successfully from the admin console. Here's the code of the client I'm trying to test it with (generated entirely by JDev except for the three method calls on adminManager): public class AdminManagerClient { public static void main(String [] args) { try { final Context context = getInitialContext(); AdminManager adminManager = (AdminManager)context.lookup("Uran-AdminManager#hu.elte.pgy2.BACNAAI.UranEJB.AdminManager"); adminManager.addAdmin("root", "root", "Kovács Isten"); adminManager.addStudent("BACNAAI", "matt", "B Cs", 2005); adminManager.addTeacher("SIPKABT", "patt", "S P", "numanal", "Dr."); } catch (Exception ex) { ex.printStackTrace(); } } private static Context getInitialContext() throws NamingException { Hashtable env = new Hashtable(); // WebLogic Server 10.x connection details env.put( Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory" ); env.put(Context.PROVIDER_URL, "t3://127.0.0.1:7101"); return new InitialContext( env ); } } But when I try to run this, I get the following error on the line with adminManager.addAdmin (that is, after the lookup): javax.ejb.EJBException: EJB Exception: ; nested exception is: Exception [EclipseLink-4002] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: java.sql.SQLException: Internal error: Cannot obtain XAConnection Creation of XAConnection for pool PGY2 failed after waitSecs:30 : java.sql.SQLException: Data Source PGY2 does not exist. Why can't the client find the data source, and how do I make it find it? EDIT: I took a closer look at WebLogic's output during deployment, and I found this. I have no idea what it means, but it may be relevant: <2010.05.20. 0:50:43 CEST> <Error> <Deployer> <BEA-149231> <Unable to set the activation state to true for the application 'PGY2'. weblogic.application.ModuleException: at weblogic.jdbc.module.JDBCModule.activate(JDBCModule.java:349) at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107) at weblogic.application.internal.flow.DeploymentCallbackFlow$2.next(DeploymentCallbackFlow.java:411) at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37) at weblogic.application.internal.flow.DeploymentCallbackFlow.activate(DeploymentCallbackFlow.java:74) Truncated. see log file for complete stacktrace weblogic.common.ResourceException: is already bound at weblogic.jdbc.common.internal.RmiDataSource.start(RmiDataSource.java:387) at weblogic.jdbc.common.internal.DataSourceManager.createAndStartDataSource(DataSourceManager.java:136) at weblogic.jdbc.common.internal.DataSourceManager.createAndStartDataSource(DataSourceManager.java:97) at weblogic.jdbc.module.JDBCModule.activate(JDBCModule.java:346) at weblogic.application.internal.flow.ModuleListenerInvoker.activate(ModuleListenerInvoker.java:107) Truncated. see log file for complete stacktrace >

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  • How does a java web project architecture look like without EJB3 ?

    - by Hendrik
    A friend and I are building a fairly complex website based on java. (PHP would have been more obvious but we chose for java because the educational aspect of this project is important to us) We have already decided to use JSF (with richfaces) for the front end and JPA for the backend and so far we have decided not to use EJB3 for the business layer. The reason we've decided not to use EJB3 is because - and please correct me if I am wrong - if we use EJB3 we can only run it on a full blown java application server like jboss and if we don't use EJB3 we can still run it on a lightweight server like tomcat. We want to keep speed and cost of our future web server in mind. So far i've worked on two JEE projects and both used the full stack with web business logic factories/persistence service entities with every layer a seperate module. Now here is my question, if you dont use EJB3 in the business logic layer. What does the layer look like? Please tell what is common practice when developing java web projects without ejb3? Do you think business logic layer can be thrown out altogether and have business logic in the backing beans? If you keep the layer, do you have all business methods static? Or do you initialize each business class as needed in the backing beans in every session as needed?

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  • Can't open DDMS

    - by Emerald214
    When I open a standalone DDMS besides Eclipse, it generates the below error. hieund@hieund:~$ ddms 01:51:58 E/ddms: Could not open Selected VM debug port (8700). Make sure you do not have another instance of DDMS or of the eclipse plugin running. If it's being used by something else, choose a new port number in the preferences. (DDMS:6904): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -5 and height 17 (DDMS:6904): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to allocate widget with width -5 and height 17 01:52:18 E/DDMS: device offline com.android.ddmlib.AdbCommandRejectedException: device offline at com.android.ddmlib.AdbHelper.setDevice(AdbHelper.java:736) at com.android.ddmlib.AdbHelper.executeRemoteCommand(AdbHelper.java:373) at com.android.ddmlib.Device.executeShellCommand(Device.java:364) at com.android.ddmuilib.SysinfoPanel.loadFromDevice(SysinfoPanel.java:159) at com.android.ddmuilib.SysinfoPanel.deviceSelected(SysinfoPanel.java:126) at com.android.ddmuilib.SelectionDependentPanel.deviceSelected(SelectionDependentPanel.java:52) at com.android.ddms.UIThread.selectionChanged(UIThread.java:1721) at com.android.ddmuilib.DevicePanel.notifyListeners(DevicePanel.java:752) at com.android.ddmuilib.DevicePanel.notifyListeners(DevicePanel.java:740) at com.android.ddmuilib.DevicePanel.access$1100(DevicePanel.java:56) at com.android.ddmuilib.DevicePanel$1.widgetSelected(DevicePanel.java:357) at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source) at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source) at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) at com.android.ddms.UIThread.runUI(UIThread.java:517) at com.android.ddms.Main.main(Main.java:116) 01:52:32 E/ddms: shutting down due to uncaught exception 01:52:32 E/ddms: Failed to execute runnable (java.lang.ArrayIndexOutOfBoundsException: -1) org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.ArrayIndexOutOfBoundsException: -1) at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Unknown Source) at org.eclipse.swt.widgets.Display.runAsyncMessages(Unknown Source) at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) at com.android.ddms.UIThread.runUI(UIThread.java:517) at com.android.ddms.Main.main(Main.java:116) Caused by: java.lang.ArrayIndexOutOfBoundsException: -1 at org.eclipse.jface.viewers.AbstractTableViewer$VirtualManager.resolveElement(AbstractTableViewer.java:100) at org.eclipse.jface.viewers.AbstractTableViewer$1.handleEvent(AbstractTableViewer.java:70) at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) at org.eclipse.swt.widgets.Table.checkData(Unknown Source) at org.eclipse.swt.widgets.Table.cellDataProc(Unknown Source) at org.eclipse.swt.widgets.Display.cellDataProc(Unknown Source) at org.eclipse.swt.internal.gtk.OS._gtk_list_store_append(Native Method) at org.eclipse.swt.internal.gtk.OS.gtk_list_store_append(Unknown Source) at org.eclipse.swt.widgets.Table.setItemCount(Unknown Source) at org.eclipse.jface.viewers.TableViewer.doSetItemCount(TableViewer.java:217) at org.eclipse.jface.viewers.AbstractTableViewer.internalVirtualRefreshAll(AbstractTableViewer.java:661) at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:635) at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:620) at org.eclipse.jface.viewers.StructuredViewer$7.run(StructuredViewer.java:1430) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1365) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1328) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1428) at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:537) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1387) at com.android.ddmuilib.logcat.LogCatPanel$LogCatTableRefresherTask.run(LogCatPanel.java:1000) at org.eclipse.swt.widgets.RunnableLock.run(Unknown Source) ... 5 more I tried to change port for DDMS in Eclipse but it still doesn't work.

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  • Has glassfish 2.1.1 a bug handling http request and handle them twice?

    - by marabol
    I'm using glassfish 2.1.1. I've watched a mysterious http/webservice-call handling. It seams an http request is handled by two different threads. After http basic authentication the first thread is faster. Persisting some data end, but writing response fails in glassfish internal. The second thread fails, because it tries to persist identical data and there are (unique) constrain failures. The response (the failure) of second thread was delivered to client. I don't won't discuss the behavior with the unique constrain failure. I've improve the webservice, so it can handle this better, because it could be happen anytime, that the client send the ws call a second time. But I think, glassfish 2.1.1 has an bug handling http request. Is there any known issue? Have I done an mistake? [#|2010-03-22T10:40:54.150+0000|INFO|sun-appserver2.1|javax.enterprise.system.core|_ThreadID=10;_ThreadName=main;|Starting Sun GlassFish Enterprise Server v2.1.1 ((v2.1 Patch06)(9.1_02 Patch12)) (build b31g-fcs) ...|#] ... [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.realm.YaJdbcRealm|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.module.security.auth.realm.YaJdbcRealm;MethodName=authenticate;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|JDBC authenticate successful for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.login.YaJdbcLoginModule|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.module.security.auth.login.YaJdbcLoginModule;MethodName=authenticate;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|JDBC login succeeded for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.realm.YaJdbcRealm|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;ClassName=mypackage.module.security.auth.realm.YaJdbcRealm;MethodName=authenticate;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;|JDBC authenticate successful for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.module.security.auth.login.YaJdbcLoginModule|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;ClassName=mypackage.module.security.auth.login.YaJdbcLoginModule;MethodName=authenticate;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;|JDBC login succeeded for: 8002 groups:[roleUser]|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.MyWebService|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.MyWebService;MethodName=enqueue;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|Received WebService call to enqueue() from client 59|#] [#|2010-03-22T11:18:44.220+0000|FINE|sun-appserver2.1|mypackage.MyWebService|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;ClassName=mypackage.MyWebService;MethodName=enqueue;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;|Received WebService call to enqueue() from client 59|#] ... [#|2010-03-22T11:18:44.267+0000|FINE|sun-appserver2.1|mypackage.MyWebService|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;ClassName=mypackage.MyWebService;MethodName=enqueue;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|Successfully finished WebService call to enqueue() from client 59|#] [#|2010-03-22T11:18:44.329+0000|WARNING|sun-appserver2.1|javax.enterprise.system.container.ejb|_ThreadID=26;_ThreadName=httpSSLWorkerThread-8080-1;_RequestID=4d8f23e9-5106-4d64-b865-1638d7075bde;|invocation error on ejb endpoint MyWebService at /MyWebserviceService/MyWebservice : com.sun.xml.stream.XMLStreamException2 javax.xml.ws.WebServiceException: com.sun.xml.stream.XMLStreamException2 at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:111) at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:281) at com.sun.xml.ws.transport.http.HttpAdapter.encodePacket(HttpAdapter.java:320) at com.sun.xml.ws.transport.http.HttpAdapter.access$100(HttpAdapter.java:93) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:454) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244) at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:135) at com.sun.enterprise.webservice.Ejb3MessageDispatcher.handlePost(Ejb3MessageDispatcher.java:113) at com.sun.enterprise.webservice.Ejb3MessageDispatcher.invoke(Ejb3MessageDispatcher.java:87) at com.sun.enterprise.webservice.EjbWebServiceServlet.dispatchToEjbEndpoint(EjbWebServiceServlet.java:231) at com.sun.enterprise.webservice.EjbWebServiceServlet.service(EjbWebServiceServlet.java:157) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at com.sun.enterprise.web.AdHocContextValve.invoke(AdHocContextValve.java:114) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:87) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:666) at com.sun.enterprise.web.connector.grizzly.comet.CometEngine.executeServlet(CometEngine.java:616) at com.sun.enterprise.web.connector.grizzly.comet.CometEngine.handle(CometEngine.java:362) at com.sun.enterprise.web.connector.grizzly.comet.CometAsyncFilter.doFilter(CometAsyncFilter.java:84) at com.sun.enterprise.web.connector.grizzly.async.DefaultAsyncExecutor.invokeFilters(DefaultAsyncExecutor.java:189) at com.sun.enterprise.web.connector.grizzly.async.DefaultAsyncExecutor.interrupt(DefaultAsyncExecutor.java:164) at com.sun.enterprise.web.connector.grizzly.async.AsyncProcessorTask.doTask(AsyncProcessorTask.java:92) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:264) at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106) Caused by: com.sun.xml.stream.XMLStreamException2 at com.sun.xml.stream.writers.XMLStreamWriterImpl.flush(XMLStreamWriterImpl.java:416) at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:109) ... 36 more Caused by: ClientAbortException: java.nio.channels.ClosedChannelException at org.apache.coyote.tomcat5.OutputBuffer.doFlush(OutputBuffer.java:385) at org.apache.coyote.tomcat5.OutputBuffer.flush(OutputBuffer.java:351) at org.apache.coyote.tomcat5.CoyoteOutputStream.flush(CoyoteOutputStream.java:176) at com.sun.xml.stream.writers.UTF8OutputStreamWriter.flush(UTF8OutputStreamWriter.java:153) at com.sun.xml.stream.writers.XMLStreamWriterImpl.flush(XMLStreamWriterImpl.java:414) ... 37 more Caused by: java.nio.channels.ClosedChannelException at sun.nio.ch.SocketChannelImpl.ensureWriteOpen(SocketChannelImpl.java:126) at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:324) at com.sun.enterprise.web.connector.grizzly.OutputWriter.flushChannel(OutputWriter.java:91) at com.sun.enterprise.web.connector.grizzly.OutputWriter.flushChannel(OutputWriter.java:66) at com.sun.enterprise.web.connector.grizzly.SocketChannelOutputBuffer.flushChannel(SocketChannelOutputBuffer.java:172) at com.sun.enterprise.web.connector.grizzly.async.AsynchronousOutputBuffer.flushChannel(AsynchronousOutputBuffer.java:81) at com.sun.enterprise.web.connector.grizzly.SocketChannelOutputBuffer.flushBuffer(SocketChannelOutputBuffer.java:205) at com.sun.enterprise.web.connector.grizzly.async.AsynchronousOutputBuffer.flushBuffer(AsynchronousOutputBuffer.java:114) at com.sun.enterprise.web.connector.grizzly.SocketChannelOutputBuffer.flush(SocketChannelOutputBuffer.java:183) at com.sun.enterprise.web.connector.grizzly.async.AsynchronousOutputBuffer.flush(AsynchronousOutputBuffer.java:104) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.action(DefaultProcessorTask.java:1100) at org.apache.coyote.Response.action(Response.java:237) at org.apache.coyote.tomcat5.OutputBuffer.doFlush(OutputBuffer.java:381) ... 41 more |#] [#|2010-03-22T11:18:44.376+0000|WARNING|sun-appserver2.1|oracle.toplink.essentials.session.file:/mygf-211/domains/mydomain/applications/j2ee-apps/myear/myjar-myPu|_ThreadID=39;_ThreadName=httpSSLWorkerThread-8080-2;_RequestID=4ca7e3e5-5ab7-41ec-b3c9-d9260b1164c9;| Local Exception Stack: Exception [TOPLINK-4002] (Oracle TopLink Essentials - 2.1 (Build b31g-fcs (10/19/2009))): oracle.toplink.essentials.exceptions.DatabaseException Internal Exception: com.microsoft.sqlserver.jdbc.SQLServerException: Eine Zeile mit doppeltem Schlüssel kann in das 'dbo.MY_TABLE'-Objekt mit dem eindeutigen 'MY_INDEX'-Index nicht eingefügt werden.

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  • Redirect output logs of javax.xml.ws and com.sun.xml.ws

    - by chrisnfoneur
    I am working on a SOAP based web service, with Sun's Metro. I am facing an annoying bug, each time I send a malformed SOAP object to my web service, sun's api spam the System.out with logs like this: javax.xml.ws.WebServiceException: com.sun.istack.XMLStreamException2: org.xml.sax.SAXParseException: cvc-complex-type.4: Attribute 'type' must appear on element 'object'. at com.sun.xml.ws.util.pipe.AbstractSchemaValidationTube.doProcess(AbstractSchemaValidationTube.java:206) at com.sun.xml.ws.util.pipe.AbstractSchemaValidationTube.processRequest(AbstractSchemaValidationTube.java:175) at com.sun.xml.ws.api.pipe.Fiber.__doRun(Fiber.java:595) at com.sun.xml.ws.api.pipe.Fiber._doRun(Fiber.java:554) at com.sun.xml.ws.api.pipe.Fiber.doRun(Fiber.java:539) at com.sun.xml.ws.api.pipe.Fiber.runSync(Fiber.java:436) at com.sun.xml.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:243) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:444) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244) at com.sun.xml.ws.transport.http.server.WSHttpHandler.handleExchange(WSHttpHandler.java:106) at com.sun.xml.ws.transport.http.server.WSHttpHandler.handle(WSHttpHandler.java:91) at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:65) at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:54) at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:68) at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:555) at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:65) at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:527) at sun.net.httpserver.ServerImpl$DefaultExecutor.execute(ServerImpl.java:119) at sun.net.httpserver.ServerImpl$Dispatcher.handle(ServerImpl.java:349) at sun.net.httpserver.ServerImpl$Dispatcher.run(ServerImpl.java:321) at java.lang.Thread.run(Thread.java:619) Caused by: com.sun.istack.XMLStreamException2: org.xml.sax.SAXParseException: cvc-complex-type.4: Attribute 'type' must appear on element 'object'. at com.sun.xml.ws.util.xml.StAXSource$1.parse(StAXSource.java:185) at com.sun.xml.ws.util.xml.StAXSource$1.parse(StAXSource.java:170) at org.apache.xerces.jaxp.validation.ValidatorHandlerImpl.validate(Unknown Source) at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source) at javax.xml.validation.Validator.validate(Validator.java:127) at com.sun.xml.ws.util.pipe.AbstractSchemaValidationTube.doProcess(AbstractSchemaValidationTube.java:204) ... 20 more I would like to switch off this log or redirect it to my error/warn/debug.log files used by log4j. I tried to add a rule in my log4j.xml file : <category name="javax.xml.ws"> <priority value="error" /> </category> It didn't worked. So I tried the following trick: java.util.logging.Logger.getLogger("javax.xml.ws.WebServiceException").setLevel( java.util.logging.Level.OFF); it didn't worked neither. Any ideas ? It is not a big issue but it makes my catalina.log getting bigger & bigger and it's not the appropriate place for this kind of log. Chris

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  • JAX-WS errors when SOAP body contains UTF-8 BOM

    - by Vinny Carpenter
    I have developed a Web Service using JAX-WS (v2.1.3 - Sun JDK 1.6.0_05) deployed on WebLogic 10.3 that works just fine when I use a Java client or SoapUI or other Web Services testing tools. I need to consume this service using 2005 Microsoft SQL Server Reporting Services and I get the following error Couldn't create SOAP message due to exception: XML reader error: unexpected character content SEVERE: Couldn't create SOAP message due to exception: XML reader error: unexpected character content: "?" com.sun.xml.ws.protocol.soap.MessageCreationException: Couldn't create SOAP message due to exception: XML reader error: unexpected character content: "?" at com.sun.xml.ws.encoding.SOAPBindingCodec.decode(SOAPBindingCodec.java:292) at com.sun.xml.ws.transport.http.HttpAdapter.decodePacket(HttpAdapter.java:276) at com.sun.xml.ws.transport.http.HttpAdapter.access$500(HttpAdapter.java:93) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:432) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:244) at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:134) at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doGet(WSServletDelegate.java:129) at com.sun.xml.ws.transport.http.servlet.WSServletDelegate.doPost(WSServletDelegate.java:160) at com.sun.xml.ws.transport.http.servlet.WSServlet.doPost(WSServlet.java:75) at javax.servlet.http.HttpServlet.service(HttpServlet.java:727) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:175) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3498) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(Unknown Source) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2180) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2086) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1406) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201) at weblogic.work.ExecuteThread.run(ExecuteThread.java:173) Caused by: com.sun.xml.ws.streaming.XMLStreamReaderException: XML reader error: unexpected character content: "?" at com.sun.xml.ws.streaming.XMLStreamReaderUtil.nextElementContent(XMLStreamReaderUtil.java:102) at com.sun.xml.ws.encoding.StreamSOAPCodec.decode(StreamSOAPCodec.java:174) at com.sun.xml.ws.encoding.StreamSOAPCodec.decode(StreamSOAPCodec.java:296) at com.sun.xml.ws.encoding.StreamSOAPCodec.decode(StreamSOAPCodec.java:128) at com.sun.xml.ws.encoding.SOAPBindingCodec.decode(SOAPBindingCodec.java:287) ... 22 more If I use a HTTP proxy to sniff out what SSRS is sending to JAX-WS, I see EF BB BF as the beginning of the post body and JAX-WS doesn't like that. If I remove the special characters and resubmit the request using Fiddler, then the web-service invocation works. Why does JAX-WS blow up with the standard UTF-8 BOM? Is there a workaround to get past this issue? Any suggestions would be greatly appreciated. Thanks --Vinny

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  • [JDBCExceptionReporter] SQL Warning in Hibernate

    - by adisembiring
    Hi all, I'm using Hibernate 3.2.1 and database SQLServer2000 while I'm try to insert some data using my dao, some warning occurred like this: java.sql.SQLWarning: [Microsoft][SQLServer 2000 Driver for JDBC]Database changed to BTN_SPP_DB at com.microsoft.jdbc.base.BaseWarnings.createSQLWarning(Unknown Source) at com.microsoft.jdbc.base.BaseWarnings.get(Unknown Source) at com.microsoft.jdbc.base.BaseConnection.getWarnings(Unknown Source) at org.hibernate.util.JDBCExceptionReporter.logAndClearWarnings(JDBCExceptionReporter.java:22) at org.hibernate.jdbc.ConnectionManager.closeConnection(ConnectionManager.java:443) at org.hibernate.jdbc.ConnectionManager.aggressiveRelease(ConnectionManager.java:400) at org.hibernate.jdbc.ConnectionManager.afterTransaction(ConnectionManager.java:287) at org.hibernate.jdbc.JDBCContext.afterTransactionCompletion(JDBCContext.java:221) at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:119) at co.id.hanoman.btnmw.spp.dao.TagihanDao.save(TagihanDao.java:43) at co.id.hanoman.btnmw.spp.dao.TagihanDao.save(TagihanDao.java:1) at co.id.hanoman.btnmw.spp.dao.test.TagihanDaoTest.testSave(TagihanDaoTest.java:81) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99) at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75) at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45) at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66) at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35) at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42) at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34) at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196) my hibernate initialization is: 2010-04-26 22:54:05,203 INFO [Version] Hibernate Annotations 3.3.0.GA 2010-04-26 22:54:05,234 INFO [Environment] Hibernate 3.2.1 2010-04-26 22:54:05,234 INFO [Environment] hibernate.properties not found 2010-04-26 22:54:05,234 INFO [Environment] Bytecode provider name : cglib 2010-04-26 22:54:05,234 INFO [Environment] using JDK 1.4 java.sql.Timestamp handling 2010-04-26 22:54:05,343 INFO [Configuration] configuring from resource: /hibernate.cfg.xml 2010-04-26 22:54:05,343 INFO [Configuration] Configuration resource: /hibernate.cfg.xml 2010-04-26 22:54:05,406 DEBUG [DTDEntityResolver] trying to resolve system-id [http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd] 2010-04-26 22:54:05,406 DEBUG [DTDEntityResolver] recognized hibernate namespace; attempting to resolve on classpath under org/hibernate/ 2010-04-26 22:54:05,406 DEBUG [DTDEntityResolver] located [http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd] in classpath 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.dialect=org.hibernate.dialect.SQLServerDialect 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.driver_class=com.microsoft.jdbc.sqlserver.SQLServerDriver 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.url=jdbc:microsoft:sqlserver://12.56.11.65:1433;databaseName=BTN_SPP_DB 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.username=spp 2010-04-26 22:54:05,453 DEBUG [Configuration] hibernate.connection.password=spp

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  • Why isn't Java more widely used for game development?

    - by Anto
    I'm not a game developer or anything, but I know that Java is not very widely used for game development. Java should be fast enough for most games, so where's the catch? I can think of some reasons: Lack of game developers with expertice in Java Lack of good game development frameworks Programmers don't want to accept Java as a games programming language. Most only accept C++ as that? No support for game consoles (though the PC market still exists) It could of course be something else. Could someone who knows the business better than me explain why Java isn't getting momentum when it comes to game development?

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  • Why isn't Java more widely used for game development?

    - by Anto
    I'm not a game developer or anything, but I know that Java is not very widely used for game development. Java should be fast enough for most games, so where's the catch? I can think of some reasons: Lack of game developers with expertice in Java Lack of good game development frameworks Programmers don't want to accept Java as a games programming language. Most only accept C++ as that? No support for game consoles (though the PC market still exists) It could of course be something else. Could someone who knows the business better than me explain why Java isn't getting momentum when it comes to game development?

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  • Which version of Java should I use for learning?

    - by Dan
    I am a QA engineer interested in mobile development and automation.I have basic programming experience (intermediate level Python, C++ programmer) and as most companies choose Java for writing frameworks I need to pickup Java. I use Ubutnu 12.04 LTS and I will be using Head First Java as learning material. When I searched for JDK options I found Oracle Java 6 and 7 and Open JDK. I read somewhere in Ubuntu forums that Java 6 is not recommended on Ubuntu systems and I am a little bit confused about which version should I use, that would be compatible with the book and the OS.

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  • How should I do 3D games through Java on a mac?

    - by Steven Rogers
    I have been self-teaching myself Java on the mac mostly because the language is cross-platform. Recently, I have been only able to develop 2D games using the Graphics2D class. Now, I want to learn how to make 3D games in Java. I used to model and animate stuff in 3D, so my knowledge of 3-Dimensional stuff is okay. I have spent the last 3 hours using google to look up ways of making 3D games in java. Apparently the best one to use is OpenGL, so i looked up a tutorial on it and i cannot find a tutorial that shows how to (if there is a way) install JOGL on the Mac platform. Should i continue to use Java? How can i make 3D games using Java? What is the best way to make 3D games on a mac?

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  • Java dev learning Python: what concepts do I need to wrap my head around?

    - by LRE
    I've run through a few tutorials and written some small projects. I'm right in the middle of a small project now infact. All is going well enough thanks in no small part to Uncle Google (who usually points me to Stackoverflow ;-) Several times in the last few days I've found myself wondering "what am I missing?" - I feel that I'm still thinking in Java as I write in Python. This question over at StackOverflow is full of tips about what resources to read up on for learning Python, but I still feel that I'm a Java dev with a dictionary (pun unintended) to translate into Python. What I really want to do is refactor my head to be able to write Pythonic Python instead of Java disguised as Python (not that I want to loose my Java skills). So, the crux of my question is: what concepts does a Java dev really need to learn to think Pythonic? This includes anything that needs to be un-learnt. ps: I consider language syntax to not be particularly relevant to this question.

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  • What's the best way to get up to speed with Java?

    - by Kosta
    I'm a software developer that just switched teams so I shall write code in Java now. Last time I wrote something in the language was in programming 101 at uni (I was already an amateur coder back then). So what is the best book/tutorial to get up to speed with Java? Where's the Java - the good parts? Learn you some Java for great good? Learn Java the hard way? Or is it too enterprisey for that kind of passion...?

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  • Java dev learning Python: what concepts do I need to wrap my head around?

    - by LRE
    I've run through a few tutorials and written some small projects. I'm right in the middle of a small project now infact. All is going well enough thanks in no small part to Uncle Google (who usually points me to Stackoverflow ;-) Several times in the last few days I've found myself wondering "what am I missing?" - I feel that I'm still thinking in Java as I write in Python. This question over at StackOverflow is full of tips about what resources to read up on for learning Python, but I still feel that I'm a Java dev with a dictionary (no pun intended) to translate into Python. What I really want to do is refactor my head to be able to write Pythonic Python instead of Java disguised as Python (not that I want to loose my Java skills). So, the crux of my question is: what concepts does a Java dev really need to learn to think Pythonic? This includes anything that needs to be un-learnt. ps: I consider language syntax to not be particularly relevant to this question.

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  • How to Reenable Apple Java 6 Plug-in for Mac EBS Users

    - by Steven Chan (Oracle Development)
    Apple's Java for OS X 2012-006 update uninstalled the Apple-provide Java applet plug-in from all Mac web browsers. Mac OS X users running Java-based applications are instructed to download the latest version of the Java 7 applet plug-in from Oracle. For more information about Oracle's Java 7 for Mac, see: Mac Java 7 FAQ: Install, Remove, Revert, Configure, Sys Req (Java.com) We're currently certifying Oracle E-Business Suite with Mac desktops running Java 7. We have identified some compatibility issues and are working with the Java team on fixes right now. Until that certification is completed, EBS users on Mac platforms can follow these instructions from Apple to ensure continued access to the E-Business Suite: Java for OS X 2012-006: How to re-enable the Apple-provided Java SE 6 applet plug-in and Web Start functionality (Apple.com) Related Articles Planning Bulletin for JRE 7: What EBS Customers Can Do Today

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  • Why did the team at LMAX use Java and design the architecture to avoid GC at all cost?

    - by kadaj
    Why did the team at LMAX design the LMAX Disruptor in Java but all their design points to minimizing GC use? If one does not want to have GC run then why use a garbage collected language? Their optimizations, the level of hardware knowledge and the thought they put are just awesome but why Java? I'm not against Java or anything, but why a GC language? Why not use something like D or any other language without GC but allows efficient code? Is it that the team is most familiar with Java or does Java possess some unique advantage that I am not seeing? Say they develop it using D with manual memory management, what would be the difference? They would have to think low level (which they already are), but they can squeeze the best performance out of the system as it's native.

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  • Oracle OpenWorld 2012?????WebLogic Server???3??????

    - by ???02
    ???????2012?9?30???10?4?(????)???4???????????????????????????Oracle OpenWorld 2012???????????????????????WebLogic Server????????????????????????????????????(Fusion Middleware?????????????????????????????)?????(???) ??????????????WebLogic Server?????? ??????Fusion Middleware??????????????????????????????????? ???????????OpenWorld??????WebLogic Server????????????????????????????(HTML5)???Oracle Database??????????3???????????????????????????? OpenWorld 2012?????????CEO????·??????????????·?????Oracle Cloud??????????SaaS?PaaS????IaaS???????????????? ??????????????????/?????????????????????????????????WebLogic Server????????????????????????????????????????·??????????????????????????????Oracle Exalogic Elastic Cloud?????????????????????????????????????????·???????????????????????? ???????????????·??????????·???????????????????????????????????????WebLogic Server?Oracle Enterprise Manager??????????????????????? ?????????????????????????????????·???????????????????????????????????????(???)????????????????????·???????????????????????????? ??????????·????????????????????????????????????????????????????????????????????Java EE????????????????????????·???????Oracle E-Business Suite????????????·???????????????????????????????????????????????????????????????????????? ??????????????????????????????????·????????????????????????????????????????????????????????????????????????????????????? ?WebLogic Server?Oracle Enterprise Manager?????????Exalogic?????????????????????????·????????????????????????????????????????????????????????????????????????????????????????????????????????OpenWorld?????????Exalogic???????????????????????/?????????????????????????????WebLogic Server?????????????????????????????????????(???) ?????????????????OpenWorld 2012???Java???????Oracle Developer Cloud Service???????????????·?????????????????????????·???????·??????????????????????????????·????·????????????????????????????Java??????????????????????????????????????????????????????????????????????????WebLogic Server????????????????? WebSockets?SSE???????Java EE???????? ????????Java??????????Java EE??????????????Java EE 7???????????????????????7???Java EE??????????????????·?????????????????????????????????????????????HTML5???????????????????????? ??????????Java EE??????????????WebLogic Server???????????12.1.2?????Java EE 7??????????Web???????????????????WebSockets???HTTP?????????????Server Sent Events(SSE)????????????????????????????OpenWorld 2012?????????WebSockets?SSE???????????????????????????Web???????????????????????????????????????????????????????????????? ???WebLogic Server?????????2013?????????????????Java EE 7??????????????????????Java?????????????????????????????????????WebLogic Server?????????????????????? ???WebLogic Server?????????????????Oracle TopLink DataService?????????????????????????????XML?JSON??????????????????????Java??????????????·????????????????????????????????????????????????????·????????????????????????? Oracle Database??????????? WebLogic Server???????????·??????????????????1???Oracle Database????????????????OpenWorld 2012?????????Oracle Database????????????????????? WebLogic Server????Oracle Real Application Clusters(RAC)?????????????????????????????????????Active GridLink for RAC??????????????????????????????????????????????????????????·?????????????Oracle RAC?????????????????·??????????????????????????????????????Oracle RAC????????????? OpenWorld 2012?????Active GridLink for RAC???????????????????????????????Application Continuity??????????????? ?????????????·???????????????Oracle RAC?????????????????????????????????????????????????????????????????Application Continuity?????JDBC???????????????????????????Oracle RAC??????????????????????????????????????????Oracle Coherence?????????????????????????????????·????????????????(???) ?????????????????·???????????????Java????????????WebLogic Server???????????????? ????????????????????????????????????????????/???????????????????WebLogic Server?????????????????????????? ??????·???????????????·????????????Java EE?????????????OpenWorld 2012????????WebLogic Server?????????????????????????????????????????????????????????????Java EE??????????????????????WebLogic Server????????????????????????????Java EE?????????????Java EE???????????????????????????(???) ????????·????????????????????????????????????Java EE????WebLogic Server?????????????????????????????????

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  • It's here, it's here! OJEC 1.1 is here -- Oracle Java ME Embedded Client

    - by hinkmond
    Download it now! OJEC 1.1 has just been released and will run on your Linux/ARM, Linux/x86, or Linux/MIPS device. Get it before supplies run out! (Not really, it's software. How can it run out?) See: Download OJEC 1.1 now! Here's a quote: Oracle offers Java ME Embedded products to meet your specific Java Technology needs. Java ME is targeted for use on devices where a feature-rich Java platform is desirable, despite lacking the resources necessary to run the full Java SE Embedded environment. Try it on your Raspberry Pi! (If you can find where to buy a Raspberry Pi that is. Now that's something that can run out) Hinkmond

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  • How do I get the Java plugin in Firefox 3.6 working?

    - by interstar
    I have Ubuntu 10.10. I needed the Sun Java so I added Sun Oracle as supplier of packages and installed java-6. However, I haven't been able to persuade Firefox to use this Java for the browser. In fact I managed to turn off the original Java plugin (I can't remember exactly how) and I can't see any way to re-enable it. Ie. it doesn't appear in the "plugins" page of the Add-ons option. (I'm in Firefox 3.6.13) Any suggestions for how to re-enable Java in FF 3.6, and make sure it's using the Sun version? thanks phil

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  • How to get familiar with "what happens underneath of Java"?

    - by FidEliO
    I did not study CS nor IT. I just became a developer, now working with Java. Actually, since I now work with a big company writing high-scalable web applications, I think I need to be better with details. I have no understanding of what happens underneath of Java. Java Performance, Server-Side Java might be the buzz words?!! I am very poor with those more of low-level details but I do not know where to look honestly. I started looking for some keywords in Amazon, ended up reading books like "pragmatic programmer", "clean code", "code complete" which IMO they are not what I am looking for. Could you please give me some learning resources (books, articles, blog posts, online trainings) for this matter? I also read this post as well: Approaching Java/JVM internals But I think I need a pre-step before jumping into the OpenJDK, right?!

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  • What are the parameters that let businesses choose .NET or Java over other languages/frameworks? [on hold]

    - by Othman
    Some of the biggest enterprise applications such as HR software, Sales and ERP, are written in .NET or Java. Also, Governments online solutions such as paying parking fines, and universities courses registration systems are all in .NET or Java. On the other hand, Facebook, Google and Wikipedia, are not using .NET or Java so much (Google uses at least both Java and Python). Twitter also was using Ruby for a long time, as well as Python. These websites work on much more data and at larger scales in terms of users and performance than any enterprise applications, yet still these companies have chosen a different path. What are the parameters driving such decisions? Note This question is not about why do you prefer x over y! or why those people are using this. The question is primarily asking about the parameters that makes Java Or .NET becomes better suite in enterprise applications based on Performance, Reliability, Scalability etc.

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  • What would you choose for your project between .NET and Java at this point in time ?

    - by Basic
    You are just starting a new project and you have these two technologies to choose from, Java and .NET. The project you are working doesn't involve having features that would make it easy to choose between the two technologies (e.g. .NET has this that I need and Java does not) and both of them should work just fine for you (though you only need one of course). Take into account: Performance Tools available (even 3rd party tools) Cross platform compatibility Libraries (especially 3rd party libraries) Cost (Oracle seems to try and monetize Java) Development process (Easiest/Fastest) Also keep in mind that Linux is not your main platform but you would like to port your project to Linux/MacOs as well. You should definitely keep in mind the trouble that has been revolving around Oracle and the Java community and the limitations of Mono and Java as well. It would be much appreciated if people with experience in both can give an overview and their own subjective view about which they would choose and why.

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  • ????:10?????Java EE???????WebLogic Server?????|WebLogic Channel|??????

    - by ???02
    WebLogic Channel????????????9?6?????WebLogic & Java EE??????????????????――Java EE???????????????????????????·??????????????????????????????UFJ??????????????????? IT??????? ??????????11?30????????? ?????? ????? 2011????????????????????·???Java??????????????????????Java EE 5???????????????????UFJ??????????????????10???????????Java EE??????????????????WebLogic Server?????????UFJ????????????????????????????????????????????????????????????????WebLogic Server?????????10???????????JavaOne???????????????Java EE??????????????????????????????Java EE??????????????????????????????????????????????????????·????????????????2011?11?30?(?) 13:00~17:30 (??12:30)???????????????·???? ???????? ?????????? B2F????????4-8-1?????(?????)???????[A-1:14:45~15:30]??UFJ???????????????????Java EE???????WebLogic Server??????UFJ??????????????????10???????????Java EE??????????????????WebLogic Server?????????UFJ??????????????????????????????????????????????????????????????????WebLogic Server?????????????????????????????????????????10??????JavaOne????????????????Java EE?????????????????????????Java EE????????????????UFJ???????????????????IT??????????? ?? ???·??????????

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  • Google App Engine with Java - Error running javac.exe compiler

    - by dta
    On Windows XP Just downloaed and unzipped google app engine java sdk to C:\Program Files\appengine-java-sdk I have jdk installed in C:\Program Files\Java\jdk1.6.0_20. I ran the sample application by appengine-java-sdk\bin\dev_appserver.cmd appengine-java-sdk\demos\guestbook\war Then I visited localhost:8080 to find : HTTP ERROR 500 Problem accessing /. Reason: Error running javac.exe compiler Caused by: Error running javac.exe compiler at org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.executeExternalCompile(DefaultCompilerAdapter.java:473) How to Fix it? My JAVA_HOME points to C:\Program Files\Java\jdk1.6.0_20. I also tried chaning my appcfg.cmd to : @"C:\Program Files\Java\jdk1.6.0_20\bin\java" -cp "%~dp0..\lib\appengine-tools-api.jar" com.google.appengine.tools.admin.AppCfg %* It too didn't work.

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