Switching to Report Designer view and opening an rptdesign file, trying to edit data set; cannot get to edit screen for the dataset. Clicking on context menu does nothing. Save icon and menu items are grayed out for all changes.

After trying this, I cannot exit me, I get an error pop-up referencing org/w3c/dom/ElementTraversal.

This started after updating JRebel to 4.6.1, and tasktop to 2.3

Installation Details:

Quote:

*** Date: Tuesday, April 3, 2012 12:28:36 PM EDT ** System properties: OS=Windows7 OS version=6.1.0 Java version=1.6.0_29 *** MyEclipse details: MyEclipse Enterprise Workbench Version: 9.1 Build id: 9.1-20110701 *** Eclipse details: MyEclipse Enterprise Workbench Version: 9.1 Build id: 9.1-20110701 Eclipse startup command=-os win32 -ws win32 -arch x86_64 -showsplash -launcher C:\Genuitec\MyEclipse\myeclipse.exe -name Myeclipse --launcher.library C:\Genuitec\MyEclipse\../../MyEclipse/Common/plugins/org.eclipse.equinox.launcher.i18n.win32.win32.x86_64_3.2.0.v201103301700\eclipse_3215.dll -startup C:\Genuitec\MyEclipse\../../MyEclipse/Common/plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar -install C:\Genuitec\MyEclipse -configuration C:\Genuitec\MyEclipse\configuration -clean -vm C:\jdk6\bin\..\jre\bin\server\jvm.dll

Here is the log file:

Code:

!SESSION 2012-04-03 12:29:49.867 ----------------------------------------------- eclipse.buildId=unknown java.version=1.6.0_29 java.vendor=Sun Microsystems Inc. BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US Command-line arguments:  -os win32 -ws win32 -arch x86_64 -clean !ENTRY org.eclipse.equinox.registry 2 0 2012-04-03 12:29:58.790 !MESSAGE The extensions and extension-points from the bundle "org.eclipse.epf.richtext" are ignored. The bundle is not marked as singleton. !ENTRY org.eclipse.core.resources 2 10035 2012-04-03 12:35:06.619 !MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes. !ENTRY org.eclipse.jface 2 0 2012-04-03 12:35:10.330 !MESSAGE Keybinding conflicts occurred.  They may interfere with normal accelerator operation. !SUBENTRY 1 org.eclipse.jface 2 0 2012-04-03 12:35:10.330 !MESSAGE A conflict occurred for CTRL+F9: Binding(CTRL+F9,    ParameterizedCommand(Command(org.eclipse.mylyn.tasks.ui.command.activateTask,Activate Task,       ,       Category(org.eclipse.ui.category.navigate,Navigate,null,true),       ,       ,,true),null),    org.eclipse.ui.defaultAcceleratorConfiguration,    org.eclipse.ui.contexts.window,,,system) Binding(CTRL+F9,    ParameterizedCommand(Command(RunSQLAction,Run SQL,       Run SQL,       Category(org.eclipse.ui.category.edit,Edit,null,true),       ,       ,,true),null),    org.eclipse.ui.defaultAcceleratorConfiguration,    org.eclipse.ui.contexts.window,,,system) !SUBENTRY 1 org.eclipse.jface 2 0 2012-04-03 12:35:10.330 !MESSAGE A conflict occurred for SHIFT+DEL: Binding(SHIFT+DEL,    ParameterizedCommand(Command(org.eclipse.datatools.sqltools.result.removeAllInstances,Remove All Visible Results,       ,       Category(org.eclipse.datatools.sqltools.result.category,SQL Results View,null,true),       ,       ,,true),null),    org.eclipse.ui.defaultAcceleratorConfiguration,    org.eclipse.ui.contexts.window,,,system) Binding(SHIFT+DEL,    ParameterizedCommand(Command(org.eclipse.ui.edit.cut,Cut,       Cut the selection to the clipboard,       Category(org.eclipse.ui.category.edit,Edit,null,true),       org.eclipse.ui.internal.handlers.WidgetMethodHandler@691574db,       ,,true),null),    org.eclipse.ui.defaultAcceleratorConfiguration,    org.eclipse.ui.contexts.dialogAndWindow,,,system) Binding(SHIFT+DEL,    ParameterizedCommand(Command(org.topcased.modeler.deleteModelObject,remove from Model,       Allows the user to delete the selected graph element and its associated model element in a Topcased editor.,       Category(org.eclipse.ui.category.edit,Edit,null,true),       ,       ,,true),null),    org.eclipse.ui.defaultAcceleratorConfiguration,    org.eclipse.ui.contexts.window,,,system) !ENTRY org.eclipse.osgi 2 1 2012-04-03 12:36:01.697 !MESSAGE NLS unused message: Unnecessary_Semicolon_ERROR in: org.eclipse.wst.html.core.internal.HTMLCorePluginResources !ENTRY org.eclipse.osgi 2 1 2012-04-03 12:36:01.698 !MESSAGE NLS missing message: Obsolete_attribute_name___ERROR_ in: org.eclipse.wst.html.core.internal.HTMLCorePluginResources !ENTRY org.eclipse.osgi 2 0 2012-04-03 12:36:03.526 !MESSAGE While loading class "org.eclipse.wst.jsdt.internal.core.JavaModelManager$16", thread "Thread[Worker-7,5,main]" timed out waiting (5000ms) for thread "Thread[Worker-13,5,main]" to finish starting bundle "org.eclipse.wst.jsdt.core_1.1.2.me201106211924 [1050]". To avoid deadlock, thread "Thread[Worker-7,5,main]" is proceeding but "org.eclipse.wst.jsdt.internal.core.JavaModelManager$16" may not be fully initialized. !STACK 0 org.osgi.framework.BundleException: State change in progress for bundle "reference:file:/C:/MyEclipse/Common/plugins/org.eclipse.wst.jsdt.core_1.1.2.me201106211924.jar" by thread "Worker-13".    at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1077)    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:282)    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    at org.eclipse.wst.jsdt.internal.core.JavaModelManager$15.run(JavaModelManager.java:4182)    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException    ... 15 more Root exception: org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException    at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1077)    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:282)    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    at org.eclipse.wst.jsdt.internal.core.JavaModelManager$15.run(JavaModelManager.java:4182)    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) !ENTRY org.eclipse.jst.jsp.core 4 4 2012-04-03 12:36:08.775 !MESSAGE A workspace crash was detected. The previous session did not exit normally. Not using saved taglib indexes. !ENTRY org.eclipse.osgi 2 1 2012-04-03 12:36:25.946 !MESSAGE NLS missing message: CONFIG_FILE_NOT_UNDER_WEBCONTENT_FOLDER in: org.eclipse.jst.jsf.validation.internal.appconfig.messages !ENTRY org.eclipse.ui 4 4 2012-04-03 12:40:31.531 !MESSAGE Unable to associate action set with part: org.eclipse.jdt.ui.PackageExplorer. Action set org.codehaus.groovy.eclipse.junit.JUnitActionSet not found. !ENTRY org.eclipse.ui 4 0 2012-04-03 12:43:24.743 !MESSAGE Unhandled event loop exception !STACK 0 java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal    at java.lang.ClassLoader.defineClass1(Native Method)    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    at org.apache.xerces.parsers.AbstractDOMParser.startDocument(Unknown Source)    at org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown Source)    at org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown Source)    at org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown Source)    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)    at org.eclipse.jface.dialogs.DialogSettings.load(DialogSettings.java:240)    at org.eclipse.jface.dialogs.DialogSettings.load(DialogSettings.java:265)    at org.eclipse.ui.plugin.AbstractUIPlugin.loadDialogSettings(AbstractUIPlugin.java:411)    at org.eclipse.ui.plugin.AbstractUIPlugin.getDialogSettings(AbstractUIPlugin.java:232)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.loadDialogSettings(BaseDialog.java:266)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.getDialogBoundsSettings(BaseDialog.java:252)    at org.eclipse.birt.report.designer.data.ui.property.AbstractPropertyDialog.initializeBounds(AbstractPropertyDialog.java:331)    at org.eclipse.jface.window.Window.create(Window.java:435)    at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.open(BaseDialog.java:101)    at org.eclipse.birt.report.designer.data.ui.actions.EditDataSetAction.doAction(EditDataSetAction.java:102)    at org.eclipse.birt.report.designer.internal.ui.views.actions.AbstractElementAction.run(AbstractElementAction.java:70)    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)    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 org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)    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:619)    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)    at org.eclipse.equinox.launcher.Main.run(Main.java:1407) Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    ... 60 more

tmccobb ,

Sorry that you are seeing this issue. We do not provide intrinsic support for third party plugins but we will surely assist you in resolving this issue.

Can you answer some more questions for us ?

1. How did you install JRebel and Tasktop plugins? Please share the update site/download links with us.

2. Can you please recheck if the versions of these plugins are compatible with Eclipse 3.6, which is the base version of MyEclipse 9.1 ?

3. To narrow down the problem, can you please uninstall the tasktop first and then JRebel to see which plugin is causing this problem.

Both updates were done in pulse. Update url for Tasktop is http://tasktop.com/downloads/update/release/ide; JRebel was installed using the default set up in pulse.

I uninstalled both Tasktop and JRebel. At first it looked as though Tasktop was the culprit. Alas, the problem persists. The only palpable difference is that where before I would not exit from ME (could not get past the error dialog), now I just get a warning that there is a fault in the ElementTraversal class, and I have an option to exit. But workspace state cannot be saved.

I actually uninstalled the Reports module and reinstalled, but I get the same error and I cannot open the Edit screen for data sets.

Here is same error in log:

Code:

!ENTRY org.eclipse.ui 4 0 2012-04-04 12:06:12.047 !MESSAGE Unhandled event loop exception !STACK 0 java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal    at java.lang.ClassLoader.defineClass1(Native Method)    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    at org.apache.xerces.parsers.AbstractDOMParser.startDocument(Unknown Source)    at org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown Source)    at org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown Source)    at org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown Source)    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)    at org.eclipse.jface.dialogs.DialogSettings.load(DialogSettings.java:240)    at org.eclipse.jface.dialogs.DialogSettings.load(DialogSettings.java:265)    at org.eclipse.ui.plugin.AbstractUIPlugin.loadDialogSettings(AbstractUIPlugin.java:411)    at org.eclipse.ui.plugin.AbstractUIPlugin.getDialogSettings(AbstractUIPlugin.java:232)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.loadDialogSettings(BaseDialog.java:266)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.getDialogBoundsSettings(BaseDialog.java:252)    at org.eclipse.birt.report.designer.data.ui.property.AbstractPropertyDialog.initializeBounds(AbstractPropertyDialog.java:331)    at org.eclipse.jface.window.Window.create(Window.java:435)    at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.open(BaseDialog.java:101)    at org.eclipse.birt.report.designer.data.ui.actions.EditDataSetAction.doAction(EditDataSetAction.java:102)    at org.eclipse.birt.report.designer.internal.ui.views.actions.AbstractElementAction.run(AbstractElementAction.java:70)    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)    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 org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)    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:619)    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)    at org.eclipse.equinox.launcher.Main.run(Main.java:1407) Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    ... 60 more

Disregard:

I upgraded to ME 10 and issues appear to be resovled.

tmccobb ,

Glad that you got it working.
Do let us know if you have any issues.

Unfortunately this has not gone away. I have even tried a fresh install of ME10 in a separate directory with no additional third party plugins added, and the problem is the same.

Is there any possibility that a recent upgrade to JDK 1.6.0_31 might be a problem?

Latest log file:

Code:

!ENTRY org.eclipse.ui 4 4 2012-04-11 10:29:29.110 !MESSAGE Unable to associate action set with part: org.eclipse.jdt.ui.PackageExplorer. Action set org.codehaus.groovy.eclipse.junit.JUnitActionSet not found. !ENTRY org.eclipse.ui 4 0 2012-04-11 10:30:53.708 !MESSAGE Unhandled event loop exception !STACK 0 java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal    at java.lang.ClassLoader.defineClass1(Native Method)    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)    at java.lang.ClassLoader.defineClass(ClassLoader.java:615)    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    at org.apache.xerces.parsers.AbstractDOMParser.startDocument(Unknown Source)    at org.apache.xerces.impl.dtd.XMLDTDValidator.startDocument(Unknown Source)    at org.apache.xerces.impl.XMLDocumentScannerImpl.startEntity(Unknown Source)    at org.apache.xerces.impl.XMLVersionDetector.startDocumentParsing(Unknown Source)    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)    at org.eclipse.jface.dialogs.DialogSettings.load(DialogSettings.java:261)    at org.eclipse.jface.dialogs.DialogSettings.load(DialogSettings.java:286)    at org.eclipse.ui.plugin.AbstractUIPlugin.loadDialogSettings(AbstractUIPlugin.java:411)    at org.eclipse.ui.plugin.AbstractUIPlugin.getDialogSettings(AbstractUIPlugin.java:232)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.loadDialogSettings(BaseDialog.java:266)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.getDialogBoundsSettings(BaseDialog.java:252)    at org.eclipse.birt.report.designer.data.ui.property.AbstractPropertyDialog.initializeBounds(AbstractPropertyDialog.java:331)    at org.eclipse.jface.window.Window.create(Window.java:435)    at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)    at org.eclipse.birt.report.designer.ui.dialogs.BaseDialog.open(BaseDialog.java:101)    at org.eclipse.birt.report.designer.data.ui.actions.EditDataSetAction.doAction(EditDataSetAction.java:105)    at org.eclipse.birt.report.designer.internal.ui.views.actions.AbstractElementAction.run(AbstractElementAction.java:70)    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)    at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)    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:4165)    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)    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:344)    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:622)    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)    at org.eclipse.equinox.launcher.Main.main(Main.java:1386)    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 com.genuitec.pulse.eclipse.launcher.Main.main(Main.java:110) Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ElementTraversal    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)    at java.security.AccessController.doPrivileged(Native Method)    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)    ... 66 more

Now it appears that having Apache Xerces2 in the classpath of the project was the culprit. Since removing it (it had been added recently) problems have (so far) disappeared.

tmccobb,

Glad that you figured it out.
Do let us know if you have any issues.