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Eclipse debugging for null pointer exception

I am getting a NullPointerException as shown below.
However, the debugger is not able to bring it up when enabled in this method, the code is getting invoked with reflections. Can you please provide me ideas\techniques to be able to debug this code?
[10/18/16 18:20:47:933 EST] 00000051 DWLExceptionU E java.lang.NullPointerException
at com.dwl.base.notification.NotificationManager$NotificationChannel.notify(NotificationManager.java:662)
at com.dwl.base.notification.NotificationManager$NotificationType.notify(NotificationManager.java:402)
at com.dwl.base.notification.NotificationManager.notify(NotificationManager.java:1454)
at com.dwl.base.notification.bean.impl.NotificationBean.notify(NotificationBean.java:142)
at com.dwl.base.notification.EJSLocalCSLNotification_e2801c59.notify(EJSLocalCSLNotification_e2801c59.java)
at com.dwl.base.notification.EJSProxy$$NotificationLocal.notify(Unknown Source)
at au.com.xxxxx.mdm.notification.NotificationHelper.sendNotification(NotificationHelper.java:75)
at au.com.xxxxxx.mdm.behaviour.SingleCustomerViewId.triggerNotification(SingleCustomerViewId.java:159)
at au.com.xxxxxxx.mdm.behaviour.SingleCustomerViewId.execute(SingleCustomerViewId.java:129)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:613)
at com.dwl.base.extensionFramework.JavaExtensionSet.invoke(JavaExtensionSet.java:159)
at com.dwl.base.extensionFramework.ExtensionHandler.executeExtension(ExtensionHandler.java:251)
at com.dwl.base.DWLCommonComponent.handleExtensions(DWLCommonComponent.java:1380)
at com.dwl.base.DWLCommonComponent.postExecute(DWLCommonComponent.java:509)
at com.dwl.tcrm.common.TCRMCommonComponent.postExecute(TCRMCommonComponent.java:263)
at com.dwl.tcrm.coreParty.component.TCRMPersonComponent.addPerson(TCRMPersonComponent.java:1641)
at com.dwl.tcrm.coreParty.component.TCRMPartyComponent.addPerson(TCRMPartyComponent.java:3079)
at com.dwl.tcrm.coreParty.component.TCRMPartyComponent.addPartySimple(TCRMPartyComponent.java:2813)
at com.dwl.tcrm.coreParty.component.TCRMPartyComponent.addParty(TCRMPartyComponent.java:2471)
at com.dwl.tcrm.coreParty.controller.TCRMCorePartyTxnBean.addPerson(TCRMCorePartyTxnBean.java:1764)
at Proxy5aa32899_c04f_46c5_9706_69af241cd3c4.addPerson(Unknown Source)
at Proxy5aa32899_c04f_46c5_9706_69af241cd3c4.addPerson(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:613)
at com.dwl.base.requestHandler.DWLTxnBP.processPersistentObject(DWLTxnBP.java:262)
at com.dwl.base.requestHandler.DWLTxnBP.execute(DWLTxnBP.java:115)
at com.dwl.base.requestHandler.DWLTxnProcessor.processTx(DWLTxnProcessor.java:98)
at com.dwl.unifi.tx.manager.CTxRxFacade.processTxNormal(CTxRxFacade.java:681)
at com.dwl.unifi.tx.manager.CTxRxFacade.processTx(CTxRxFacade.java:544)
at com.dwl.base.requestHandler.DWLRequestHandler.processTransaction(DWLRequestHandler.java:1187)
at com.dwl.base.requestHandler.DWLRequestHandler.processTx(DWLRequestHandler.java:591)
at com.dwl.base.requestHandler.DWLServiceControllerBase.processRequest(DWLServiceControllerBase.java:253)
at com.dwl.base.requestHandler.beans.EJSRemoteCSLDWLServiceController_2c54996d.processRequest(EJSRemoteCSLDWLServiceController_2c54996d.java)
at com.dwl.base.requestHandler.beans._EJSRemoteCSLDWLServiceController_2c54996d_Tie.processRequest(_EJSRemoteCSLDWLServiceController_2c54996d_Tie.java:1)
at com.dwl.base.requestHandler.beans._EJSRemoteCSLDWLServiceController_2c54996d_Tie._invoke(_EJSRemoteCSLDWLServiceController_2c54996d_Tie.java)
at com.ibm.CORBA.iiop.ServerDelegate.dispatchInvokeHandler(ServerDelegate.java:669)
at com.ibm.CORBA.iiop.ServerDelegate.dispatch(ServerDelegate.java:523)
at com.ibm.rmi.iiop.ORB.process(ORB.java:523)
at com.ibm.CORBA.iiop.ORB.process(ORB.java:1575)
at com.ibm.rmi.iiop.Connection.doRequestWork(Connection.java:3039)
at com.ibm.rmi.iiop.Connection.doWork(Connection.java:2922)
at com.ibm.rmi.iiop.WorkUnitImpl.doWork(WorkUnitImpl.java:64)
at com.ibm.ejs.oa.pool.PooledThread.run(ThreadPool.java:118)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1892)

Can you please provide me ideas\techniques to be able to debug this code?
Since you said the method is called from reflection, you can see that in the stacktrace.
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:88)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:613)
So, keep reading up from that.
I'm guessing you intentionally edited the xxxx values, so these are your libraries that are being dynamically called.
at au.com.xxxxx.mdm.notification.NotificationHelper.sendNotification(NotificationHelper.java:75)
at au.com.xxxxxx.mdm.behaviour.SingleCustomerViewId.triggerNotification(SingleCustomerViewId.java:159)
at au.com.xxxxxxx.mdm.behaviour.SingleCustomerViewId.execute(SingleCustomerViewId.java:129)
Then, the rest of the call stack just goes through some other code library within the same package.
at com.dwl.base.notification.NotificationManager$NotificationChannel.notify(NotificationManager.java:662)
at com.dwl.base.notification.NotificationManager$NotificationType.notify(NotificationManager.java:402)
at com.dwl.base.notification.NotificationManager.notify(NotificationManager.java:1454)
at com.dwl.base.notification.bean.impl.NotificationBean.notify(NotificationBean.java:142)
at com.dwl.base.notification.EJSLocalCSLNotification_e2801c59.notify(EJSLocalCSLNotification_e2801c59.java)
at com.dwl.base.notification.EJSProxy$$NotificationLocal.notify(Unknown Source)
So, the problem definitely starts at NotificationHelper.sendNotification(NotificationHelper.java:75), but it cannot easily be determined the path that the code took in order to reach its eventual destination or what exactly caused the exception without inspecting the source of (NotificationManager.java:662)

MarshalException: Failed to communicate due to unread block data [closed]

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I am getting this exception in my java program.Can anyone have idea on it?
MarshalException: Failed to communicate due to unread block data
java.rmi.MarshalException: Failed to communicate.
Problem during marshalling/unmarshalling; nested exception is:
java.lang.IllegalStateException: unread block data
com.naresh.product.common.exception.ApplicationException:
java.rmi.MarshalException: Failed to communicate.
Problem during marshalling/unmarshalling; nested exception is:
java.lang.IllegalStateException: unread block data
at com.naresh.product.client.library.util.ServerDelegate.search(Unknown Source)
at com.naresh.product.client.Product.workflow.form4.ProductForm4DashboardView.refreshDashboard(Unknown Source)
at com.naresh.product.client.Product.workflow.form4.ProductForm4DashboardView.access$3(Unknown Source)
at com.naresh.product.client.Product.workflow.form4.ProductForm4DashboardView$7.run(Unknown Source)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
at com.naresh.product.client.Product.workflow.form4.ProductForm4DashboardView.refreshDashboard(Unknown Source)
at com.naresh.product.client.Product.workflow.form4.ProductForm4DashboardView$5.widgetSelected(Unknown Source)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:234)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at com.naresh.product.client.app.Application.start(Unknown Source)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:620)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:575)
at org.eclipse.equinox.launcher.Main.run(Main.java:1408)
Caused by: java.rmi.MarshalException: Failed to communicate. Problem during marshalling/unmarshalling; nested exception is:
java.lang.IllegalStateException: unread block data
at org.jboss.remoting.transport.socket.SocketClientInvoker.handleException(SocketClientInvoker.java:122)
at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:646)
at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:122)
at org.jboss.remoting.Client.invoke(Client.java:1634)
at org.jboss.remoting.Client.invoke(Client.java:548)
at org.jboss.invocation.unified.interfaces.UnifiedInvokerProxy.invoke(UnifiedInvokerProxy.java:183)
at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:365)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:197)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:61)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:70)
at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:112)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:100)
at $Proxy1.search(Unknown Source)
... 34 more
Caused by: java.lang.IllegalStateException: unread block data
at java.io.ObjectInputStream$BlockDataInputStream.setBlockDataMode(ObjectInputStream.java:2376)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1360)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1870)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1752)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObjectVersion2_2(JavaSerializationManager.java:239)
at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:133)
at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:120)
at org.jboss.invocation.unified.marshall.InvocationUnMarshaller.read(InvocationUnMarshaller.java:59)
at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.versionedRead(MicroSocketClientInvoker.java:957)
at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:586)
... 45 more
Why this exception is comming. Do you guys have any idea to solve it?

From java.io.ObjectInputStream.BlockDataInputStream Javadoc :
boolean java.io.ObjectInputStream.BlockDataInputStream.setBlockDataMode(boolean newmode) throws IOException
Sets block data mode to the given mode (true == on, false == off) and
returns the previous mode value. If the new mode is the same as the
old mode, no action is taken. Throws IllegalStateException if block
data mode is being switched from on to off while unconsumed block data
is still present in the stream.
But in your stacktrace, the problem takes its origin from org.jboss.remoting.transport.socket.MicroSocketClientInvoker which processes deserialization on some objects.
So, you can imagine that it is hard to guess the cause of this error with just a stacktrace.
With a little luck, you could have a precise answer.
But if it is not the case, I propose you some tracks :
to update or downgrade the version of the jboss lib if possible. Maybe, it is a bug.
to run your server with breakpoints to discover the root of the problem.
to ask your question to JBoss support

Printing SAP Crystal Reports using Java

I am trying to print reports using the Crystal Report API based on this example.
reportClientDoc.open(reportpath+reportName, 0);
//Create and set print options.
PrintReportOptions printOptions = new PrintReportOptions();
printOptions.setPrinterName(printerName); //Note: Printer 'printername' must already be configured at Operating system level.
printOptions.setJobTitle(reportName); // job title by the report file name
printOptions.setPrinterDuplex(PrinterDuplex.simplex);
printOptions.setPaperSource(PaperSource.auto);
printOptions.setPaperSize(PaperSize.paperA4);
printOptions.setNumberOfCopies(1);
printOptions.setCollated(false);
reportClientDoc.getPrintOutputController().printReport(printOptions);
But I can't get it working, I receive a java.util.concurrent.CancellationException:
java.util.concurrent.CancellationException
at com.businessobjects.crystalreports.printer.bean.Printer.X(Unknown Source)
at com.businessobjects.crystalreports.printer.bean.ReportPrinter.print(Unknown Source)
at com.businessobjects.crystalreports.printer.bean.ReportPrinter.print(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.PrintOutputController.printReport(SourceFile:742)
at my.test.crystal.GenerateReport.doGet(GenerateReport.java:108)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.awt.print.PrinterAbortException
at com.businessobjects.crystalreports.viewer.core.ReportPagePrinter.print(Unknown Source)
at sun.print.RasterPrinterJob.printPage(RasterPrinterJob.java:1936)
at sun.print.RasterPrinterJob.print(RasterPrinterJob.java:1431)
at com.businessobjects.crystalreports.viewer.core.ReportPagePrinter.print(Unknown Source)
The very strange thing is that the example worked previously in another project, but no longer on my local environment! I probably changed something but I can't figure out what :(
I tried with several printers (local and network) but the scenario is always the same: I can see the job during a very short time in printer job list but after less than 1 second, it vanishes and I receive the exception.
I am using Tomcat 7 and I tried with JDK1.6 and 1.7 (thinking about a JDK issue?) but there's no change.
If someone can give me some leads because currently, I am totally stuck.
Thx

Make sure you add ReportViewer.jar to your libraries.
For code completion, this doesn't seem necessary, but it is for printing.

BindException: Address already in use: Cannot bind

I have a JSF webpage and form. On submit i validate the model number that was entered in. When I run the bit of code in JUnit that throws the exception all my tests pass just fine. When I enter in a model number and am the only one logged in this form it works just fine. I'm thinking this is a race condition of sorts...
the code that fails is this
public static int getCountOfSameModelsInItemInventory(String[] models) {
int count = 0;
if (initialize()) {
try (Connection conn = DriverManager.getConnection(AOurl, userName, password)) {
count = TryWithConnection(models, conn);
} catch (SQLException ex) {
Logger.getLogger(SqlInformationHolder.class.getName()).log(Level.SEVERE, null, ex);
}
}
return count;
}
the line number indicates that it fails here try (Connection conn = DriverManager.getConnection(AOurl, userName, password)) {
I have a C# background so my first instinct is to use a lock around my Connection, but I don't think java has that. My research is saying that the error is thrown if the port is already in use.I'm not sure if this is enough information or not, but I will edit my post if need be.
So I guess in the end I have 2 questions.. the obvious one: "How do I fix this", and two is there a design pattern/ best practice that would help avoid this?
On average I have about 5 people using the webpage, and this is the only method that makes a call to this specific server . The other methods use a different SQL server.
EDIT
so I have 1 other method that makes a call to this server. I'm looking at it to see if all the resources are cleared.
EDIT
Oct 08, 2014 9:17:09 AM dli_qc_v2.SqlInformationHolder getCountOfSameModelsInItemInventory
SEVERE: null
com.microsoft.sqlserver.jdbc.SQLServerException: The connection to the host OURSERVER, named instance THEINSTNACE failed. Error: "java.net.BindException: Address already in use: Cannot bind". Verify the server and instance names and check that no firewall is blocking UDP traffic to port 1434. For SQL Server 2005 or later, verify that the SQL Server Browser Service is running on the host.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:190)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.getInstancePort(SQLServerConnection.java:3589)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.primaryPermissionCheck(SQLServerConnection.java:1225)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:972)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:827)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at dli_qc_v2.SqlInformationHolder.getCountOfSameModelsInItemInventory(SqlInformationHolder.java:110)
at dli_qc_v2.DLIModelValidator.validate(DLIModelValidator.java:56)
at dli_qc_v2.NcpFormBean.verifyingModelValue(NcpFormBean.java:327)
at dli_qc_v2.NcpFormBean.fillForm(NcpFormBean.java:230)
at sun.reflect.GeneratedMethodAccessor447.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:273)
at org.apache.myfaces.view.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:83)
at javax.faces.component._MethodExpressionToMethodBinding.invoke(_MethodExpressionToMethodBinding.java:88)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:100)
at javax.faces.component.UICommand.broadcast(UICommand.java:120)
at javax.faces.component.UIViewRoot._broadcastAll(UIViewRoot.java:937)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:271)
at javax.faces.component.UIViewRoot._process(UIViewRoot.java:1249)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:675)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:34)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:171)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:189)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2442)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2431)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

java.lang.NullPointerException: null entities are not supported by org.hibernate.event.def.EventCache [closed]

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.
This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.
Closed 9 years ago.
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I have a problem when trying to persist a class...
Hibernate throws this exception:
Root cause:
java.lang.NullPointerException: null entities are not supported by org.hibernate.event.def.EventCache
at org.hibernate.event.def.EventCache.containsKey(EventCache.java:80)
at org.hibernate.event.def.DefaultMergeEventListener.mergeTransientEntity(DefaultMergeEventListener.java:361)
at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:303)
at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:258)
at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:84)
at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:867)
at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:851)
at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:855)
at com.mycompany.myapp.service.data.DataServiceBean.merge(DataServiceBean.java:1337)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy64.merge(Unknown Source)
at com.mycompany.myapp.web.base.BaseForm.store(BaseForm.java:991)
at com.mycompany.myapp.web.base.BaseForm.store(BaseForm.java:942)
at com.mycompany.myapp.web.forms.therapie.TherapieForm.onSaveFormData(TherapieForm.java:591)
at com.mycompany.myapp.web.base.BaseForm.doSave(BaseForm.java:370)
at com.mycompany.myapp.web.base.BaseForm.saveAndTrigger(BaseForm.java:1137)
at com.mycompany.myapp.web.forms.reason.GrundEingabeForm$5.onSubmit(GrundEingabeForm.java:302)
at com.mycompany.myapp.web.comp.MyAppAjaxButton$1.onSubmit(MyAppAjaxButton.java:65)
at com.mycompany.myapp.web.comp.MyAppAjaxFormSubmitBehavior.onEvent(MyAppAjaxFormSubmitBehavior.java:151)
at org.apache.wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:177)
at org.apache.wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:286)
at org.apache.wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:119)
at org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)
at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:312)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1139)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:378)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:417)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:535)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:880)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:747)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:228)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:520)
At first, Therapie class had a property that couldn't be null in the database and I thought that this exception was thrown because that property was null... but I got rid of the constraint on the database (now that property is nullable) and the exception keeps being thrown when the property has no value at the point of being saved.
If that property is not null (it has a value set), then the exception is not thrown, but if it has no value (is null) then the exception is thrown...
What is happening?

Well, the class was extending another one that had a getWeight() method marked as not optional... so I was just being dumb....