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Well, It seems that after I allowed the Java 1.6 install to occur on my Mac (10.5.2), Ant got upgraded too and now when I go to create a new Servlet in a project, I get the much maligned: java.lang.UnsupportedClassVersionError: Bad version number in .class file error. I verified multiple times that the Java version the project uses, builds to, and runs the IDE are all 1.5. I verified that no symlinks got created by the install that points to the new 1.6 java/javac. A good dig into the process list verified this to be true. The *only* difference I can find now comes from an 'ant -diagnostics': My initial inclination was that this was in fact an Ant error, as Ant too was updated during the java6 install. Petr Jiricka mentioned that Ant is not involved in the creation of a new Servlet, so the error lies elsewhere. I will add a note or two to this issue when I get back to work and can post the diff to what in the Java Framework tree was modified. I will also generate a the stacktrace and post it or the URL to where it can be found at.
Here is the stack trace: java.lang.UnsupportedClassVersionError: Bad version number in .class file at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:675) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) at java.net.URLClassLoader.access$100(URLClassLoader.java:56) at java.net.URLClassLoader$1.run(URLClassLoader.java:195) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:316) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:280) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:200) at java.lang.ClassLoader.loadClass(ClassLoader.java:251) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:374) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at sun.misc.Service$LazyIterator.next(Service.java:271) at javax.script.ScriptEngineManager.initEngines(ScriptEngineManager.java:127) at javax.script.ScriptEngineManager.access$000(ScriptEngineManager.java:55) at javax.script.ScriptEngineManager$1.run(ScriptEngineManager.java:98) at java.security.AccessController.doPrivileged(Native Method) at javax.script.ScriptEngineManager.init(ScriptEngineManager.java:96) at javax.script.ScriptEngineManager.<init>(ScriptEngineManager.java:69) at org.netbeans.modules.templates.ScriptingCreateFromTemplateHandler.engine(ScriptingCreateFromTemplateHandler.java:125) at org.netbeans.modules.templates.ScriptingCreateFromTemplateHandler.accept(ScriptingCreateFromTemplateHandler.java:67) at org.openide.loaders.MultiDataObject.handleCreateFromTemplate(MultiDataObject.java:694) at org.openide.loaders.DefaultDataObject.handleCreateFromTemplate(DefaultDataObject.java:159) at org.openide.loaders.DataObject$CreateAction.run(DataObject.java:1247) at org.openide.loaders.DataObjectPool$1WrapAtomicAction.run(DataObjectPool.java:238) at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120) at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499) at org.openide.loaders.DataObjectPool.runAtomicAction(DataObjectPool.java:250) at org.openide.loaders.DataObject.invokeAtomicAction(DataObject.java:861) at org.openide.loaders.DataObject.createFromTemplate(DataObject.java:793) at org.netbeans.modules.web.wizards.ServletIterator.instantiate(ServletIterator.java:207) at org.openide.loaders.TemplateWizard.handleInstantiate(TemplateWizard.java:595) at org.openide.loaders.TemplateWizard.instantiateNewObjects(TemplateWizard.java:416) at org.openide.loaders.TemplateWizardIterImpl.instantiate(TemplateWizardIterImpl.java:248) at org.openide.loaders.TemplateWizardIteratorWrapper.instantiate(TemplateWizardIteratorWrapper.java:161) at org.openide.WizardDescriptor.callInstantiateOpen(WizardDescriptor.java:1387) at org.openide.WizardDescriptor.callInstantiate(WizardDescriptor.java:1341) at org.openide.WizardDescriptor.access$1600(WizardDescriptor.java:119) at org.openide.WizardDescriptor$Listener$2$1.run(WizardDescriptor.java:1908) at org.openide.WizardDescriptor$Listener$2.run(WizardDescriptor.java:1957) at org.openide.WizardDescriptor.lazyValidate(WizardDescriptor.java:1316) at org.openide.WizardDescriptor.access$1200(WizardDescriptor.java:119) at org.openide.WizardDescriptor$Listener.actionPerformed(WizardDescriptor.java:1964) Caused: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:449) Caused: java.lang.reflect.UndeclaredThrowableException at $Proxy24.actionPerformed(Unknown Source) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:5602) at javax.swing.JComponent.processMouseEvent(JComponent.java:3135) at java.awt.Component.processEvent(Component.java:5367) at java.awt.Container.processEvent(Container.java:2010) at java.awt.Component.dispatchEventImpl(Component.java:4068) at java.awt.Container.dispatchEventImpl(Container.java:2068) at java.awt.Component.dispatchEvent(Component.java:3903) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866) at java.awt.Container.dispatchEventImpl(Container.java:2054) at java.awt.Window.dispatchEventImpl(Window.java:1791) at java.awt.Component.dispatchEvent(Component.java:3903) at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:180) at java.awt.Dialog$1.run(Dialog.java:535) at java.awt.Dialog$2.run(Dialog.java:563) at java.security.AccessController.doPrivileged(Native Method) at java.awt.Dialog.show(Dialog.java:561) at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:834) at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:868) at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:856) at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:104) at org.openide.util.Mutex.doEventAccess(Mutex.java:1223) at org.openide.util.Mutex.readAccess(Mutex.java:242) at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:841) at java.awt.Component.show(Component.java:1302) at java.awt.Component.setVisible(Component.java:1255) at org.openide.loaders.TemplateWizard.instantiateImpl(TemplateWizard.java:502) at org.openide.loaders.TemplateWizard.instantiate(TemplateWizard.java:381) at org.netbeans.modules.project.ui.actions.NewFile.doPerform(NewFile.java:147) at org.netbeans.modules.project.ui.actions.NewFile.access$200(NewFile.java:80) at org.netbeans.modules.project.ui.actions.NewFile$PopupListener.actionPerformed(NewFile.java:340) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258) at javax.swing.AbstractButton.doClick(AbstractButton.java:334) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1051) at apple.laf.CUIAquaMenuItem.doClick(CUIAquaMenuItem.java:119) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1092) at java.awt.Component.processMouseEvent(Component.java:5602) at javax.swing.JComponent.processMouseEvent(JComponent.java:3135) at java.awt.Component.processEvent(Component.java:5367) at java.awt.Container.processEvent(Container.java:2010) at java.awt.Component.dispatchEventImpl(Component.java:4068) at java.awt.Container.dispatchEventImpl(Container.java:2068) at java.awt.Component.dispatchEvent(Component.java:3903) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866) at java.awt.Container.dispatchEventImpl(Container.java:2054) at java.awt.Window.dispatchEventImpl(Window.java:1791) at java.awt.Component.dispatchEvent(Component.java:3903) [catch] at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
As an addendum, I have verified that this same error occurs when I try and create a new JSP or CSS as well.
*** This issue has been marked as a duplicate of 129227 ***