java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.bea.plateng.domain.assignment.JDBCPoolJMSJDBCStoreAssignment.createSourceTree(JDBCPoolJMSJDBCStoreAssignment.java:61)
at com.bea.plateng.domain.assignment.AssignmentTree.buildModel(AssignmentTree.java:326)
at com.bea.plateng.domain.assignment.AssignmentTreeDefinition.createAssignment(AssignmentTreeDefinition.java:308)
at com.bea.plateng.domain.DomainTemplate.getAssignment(DomainTemplate.java:923)
at com.bea.plateng.domain.operation.ConfigJDBCConnectionPool.acceptChanges(ConfigJDBCConnectionPool.java:98)
at com.bea.plateng.wizard.domain.console.tasks.EditPropertiesTask.acceptChanges(EditPropertiesTask.java:107)
at com.bea.plateng.wizard.domain.console.tasks.EditPropertiesTask.onMainWidgetLeave(EditPropertiesTask.java:47)
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:324)
at com.bea.plateng.common.ui.console.DelegateConsoleWidget.invokeWidgetCallback(DelegateConsoleWidget.java:180)
at com.bea.plateng.wizard.console.tasks.ConsoleInteractTask2.onLeave(ConsoleInteractTask2.java:425)
at com.bea.plateng.wizard.console.tasks.ConsoleInteractTask2.okNext(ConsoleInteractTask2.java:355)
at com.bea.plateng.wizard.WizardController.nextTask(WizardController.java:635)
at com.bea.plateng.wizard.WizardController.run(WizardController.java:513)
at java.lang.Thread.run(Thread.java:536)

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