java.lang.StringIndexOutOfBoundsException: String index out of range:  0 

	at java.lang.String.charAt(String.java: 444 )

	at oracle.toplink.workbench.model.meta.MWMethodCodeGenPolicy.uniqueParameterName(MWMethodCodeGenPolicy.java: 68 )

	at oracle.toplink.workbench.model.meta.MWMethodCodeGenPolicy.addArgument(MWMethodCodeGenPolicy.java: 55 )

	at oracle.toplink.workbench.model.meta.MWMethodCodeGenPolicy.insertArguments(MWMethodCodeGenPolicy.java: 40 )

	at oracle.toplink.workbench.model.meta.MWMethod.methodDefinition(MWMethod.java: 954 )

	at oracle.toplink.workbench.model.meta.MWClass.classDefinition(MWClass.java: 2732 )

	at oracle.toplink.workbench.model.meta.MWBasicClassCodeGenPolicy.classDefinition(MWBasicClassCodeGenPolicy.java: 21 )

	at oracle.toplink.workbench.model.desc.MWEjbDescriptor.generateSourceCode(MWEjbDescriptor.java: 226 )

	at oracle.toplink.workbench.model.generation.MWSourceCodeGenerator.generateSourceCode(MWSourceCodeGenerator.java: 118 )

	at oracle.toplink.workbench.model.generation.MWSourceCodeGenerator.generateSourceCode(MWSourceCodeGenerator.java: 108 )

	at oracle.toplink.workbench.ui.ModelSourceGenerationCoordinator.exportModelJavaSource(ModelSourceGenerationCoordinator.java: 67 )

	at oracle.toplink.workbench.ui.MainView.exportModelJavaSource(MainView.java: 679 )

	at oracle.toplink.workbench.ui.MainView.exportModelJavaSourceForSelectedDescriptors(MainView.java: 670 )

	at oracle.toplink.workbench.ui.ActionManager$ 58 .actionPerformed(ActionManager.java: 1510 )

	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java: 1786 )

	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java: 1839 )

	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java: 420 )

	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java: 258 )

	at javax.swing.AbstractButton.doClick(AbstractButton.java: 289 )

	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java: 1113 )

	at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java: 943 )

	at java.awt.Component.processMouseEvent(Component.java: 5100 )

	at java.awt.Component.processEvent(Component.java: 4897 )

	at java.awt.Container.processEvent(Container.java: 1569 )

	at java.awt.Component.dispatchEventImpl(Component.java: 3615 )

	at java.awt.Container.dispatchEventImpl(Container.java: 1627 )

	at java.awt.Component.dispatchEvent(Component.java: 3477 )

	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java: 3483 )

	at java.awt.LightweightDispatcher.processMouseEvent(Container.java: 3198 )

	at java.awt.LightweightDispatcher.dispatchEvent(Container.java: 3128 )

	at java.awt.Container.dispatchEventImpl(Container.java: 1613 )

	at java.awt.Window.dispatchEventImpl(Window.java: 1606 )

	at java.awt.Component.dispatchEvent(Component.java: 3477 )

	at java.awt.EventQueue.dispatchEvent(EventQueue.java: 456 )

	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java: 201 )

	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java: 151 )

	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java: 145 )

	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java: 137 )

	at java.awt.EventDispatchThread.run(EventDispatchThread.java: 100 )