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Build Identifier: 20110615-0604 I like to edit JSPs with the Web Page Editor so I can see a preview. The problem is that sometimes it works and sometimes it doesn't. What happens is that in one Eclipse session I will open a few JSPs with the Web Page Editor and everything will fine. Then I reboot the computer for some reason and start Eclipse again. Now none of the Web Page Editors will open, they all give me this exception: java.lang.NullPointerException at org.eclipse.jst.jsf.core.internal.tld.CMUtil.getStandaloneTLDURI(CMUtil.java:129) at org.eclipse.jst.jsf.core.internal.tld.CMUtil.getURIFromTaglibRecord(CMUtil.java:117) at org.eclipse.jst.jsf.core.metadata.internal.TaglibMetaDataLocator.findTLD(TaglibMetaDataLocator.java:86) at org.eclipse.jst.jsf.core.metadata.internal.TaglibMetaDataLocator.locateMetaDataModelProviders(TaglibMetaDataLocator.java:70) at org.eclipse.jst.jsf.common.metadata.internal.DomainLoadingStrategy.locateMetaDataSourceInstances(DomainLoadingStrategy.java:143) at org.eclipse.jst.jsf.common.metadata.internal.DomainLoadingStrategy.load(DomainLoadingStrategy.java:55) at org.eclipse.jst.jsf.common.metadata.internal.MetaDataModel.load(MetaDataModel.java:93) at org.eclipse.jst.jsf.common.metadata.internal.MetaDataModelManager.loadMetadata(MetaDataModelManager.java:147) at org.eclipse.jst.jsf.common.metadata.internal.MetaDataModelManager.getModel(MetaDataModelManager.java:90) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getMDModel(MetaDataQueryHelper.java:124) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getModel(MetaDataQueryHelper.java:59) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getEntities(MetaDataQueryHelper.java:69) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getEntity(MetaDataQueryHelper.java:64) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getTrait(MetaDataQueryHelper.java:96) at org.eclipse.jst.pagedesigner.dtmanager.DefaultDTInfoFactory.getDTInfo(DefaultDTInfoFactory.java:55) at org.eclipse.jst.pagedesigner.dtmanager.DTManager.getDTInfo(DTManager.java:99) at org.eclipse.jst.pagedesigner.dtmanager.converter.internal.DTTagConverterFactory.createConverter(DTTagConverterFactory.java:32) at org.eclipse.jst.pagedesigner.dtmanager.DTManager.getTagConverter(DTManager.java:65) at org.eclipse.jst.pagedesigner.parts.ElementEditPart.getTagConverter(ElementEditPart.java:163) at org.eclipse.jst.pagedesigner.parts.ElementEditPart.setModel(ElementEditPart.java:84) at org.eclipse.jst.pagedesigner.parts.HTMLEditPartsFactory.createEditPart(HTMLEditPartsFactory.java:69) at org.eclipse.gef.editparts.AbstractEditPart.createChild(AbstractEditPart.java:269) at org.eclipse.gef.editparts.AbstractEditPart.refreshChildren(AbstractEditPart.java:780) at org.eclipse.jst.pagedesigner.parts.DocumentEditPart.refreshChildren(DocumentEditPart.java:134) at org.eclipse.jst.pagedesigner.parts.DocumentEditPart.refreshChildren(DocumentEditPart.java:126) at org.eclipse.gef.editparts.AbstractEditPart.refresh(AbstractEditPart.java:726) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.refresh(AbstractGraphicalEditPart.java:644) at org.eclipse.jst.pagedesigner.parts.DocumentEditPart.refresh(DocumentEditPart.java:114) at org.eclipse.gef.editparts.AbstractEditPart.addNotify(AbstractEditPart.java:253) at org.eclipse.gef.editparts.AbstractGraphicalEditPart.addNotify(AbstractGraphicalEditPart.java:223) at org.eclipse.jst.pagedesigner.parts.NodeEditPart.addNotify(NodeEditPart.java:104) at org.eclipse.gef.editparts.AbstractEditPart.addChild(AbstractEditPart.java:212) at org.eclipse.gef.editparts.SimpleRootEditPart.setContents(SimpleRootEditPart.java:105) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:617) at org.eclipse.gef.ui.parts.AbstractEditPartViewer.setContents(AbstractEditPartViewer.java:626) at org.eclipse.jst.pagedesigner.editors.SimpleGraphicalEditor.setModel(SimpleGraphicalEditor.java:425) at org.eclipse.jst.pagedesigner.editors.HTMLEditor.connectDesignPage(HTMLEditor.java:364) at org.eclipse.jst.pagedesigner.editors.HTMLEditor.createPages(HTMLEditor.java:444) at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(MultiPageEditorPart.java:348) at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:670) at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465) at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595) at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313) at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180) at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270) at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473) at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1245) at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1198) at org.eclipse.ui.internal.PartStack.presentationSelectionChanged(PartStack.java:834) at org.eclipse.ui.internal.PartStack.access$1(PartStack.java:823) at org.eclipse.ui.internal.PartStack$1.selectPart(PartStack.java:137) at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation$1.handleEvent(TabbedStackPresentation.java:133) at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:269) at org.eclipse.ui.internal.presentations.util.AbstractTabFolder.fireEvent(AbstractTabFolder.java:278) at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder.access$1(DefaultTabFolder.java:1) at org.eclipse.ui.internal.presentations.defaultpresentation.DefaultTabFolder$2.handleEvent(DefaultTabFolder.java:88) 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.Widget.sendEvent(Widget.java:1077) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:774) at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:2745) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1432) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:257) 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:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) 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:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) 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) Reproducible: Sometimes Steps to Reproduce: A have not been able to find a way to reproduce this with certainty. However, once an Eclipse session has decided that is doesn't like the Web Page Editor, it will not open any JSP.
Reproducible each time, working with Eclipse 4.4 on linux eclipse.buildId=4.4.0.I20140606-1215 java.version=1.7.0_60 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Framework arguments: -product org.eclipse.epp.package.standard.product Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.standard.product java.lang.NullPointerException at org.eclipse.jst.jsf.core.internal.tld.CMUtil.getStandaloneTLDURI(CMUtil.java:129) at org.eclipse.jst.jsf.core.internal.tld.CMUtil.getURIFromTaglibRecord(CMUtil.java:117) at org.eclipse.jst.jsf.core.metadata.internal.TaglibMetaDataLocator.findTLD(TaglibMetaDataLocator.java:86) at org.eclipse.jst.jsf.core.metadata.internal.TaglibMetaDataLocator.locateMetaDataModelProviders(TaglibMetaDataLocator.java:70) at org.eclipse.jst.jsf.common.metadata.internal.DomainLoadingStrategy.locateMetaDataSourceInstances(DomainLoadingStrategy.java:143) at org.eclipse.jst.jsf.common.metadata.internal.DomainLoadingStrategy.load(DomainLoadingStrategy.java:55) at org.eclipse.jst.jsf.common.metadata.internal.MetaDataModel.load(MetaDataModel.java:93) at org.eclipse.jst.jsf.common.metadata.internal.MetaDataModelManager.loadMetadata(MetaDataModelManager.java:150) at org.eclipse.jst.jsf.common.metadata.internal.MetaDataModelManager.getModel(MetaDataModelManager.java:93) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getMDModel(MetaDataQueryHelper.java:124) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getModel(MetaDataQueryHelper.java:59) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getEntities(MetaDataQueryHelper.java:69) at org.eclipse.jst.jsf.common.metadata.query.internal.MetaDataQueryHelper.getEntity(MetaDataQueryHelper.java:64) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor$SymbolContribAggregator.create(JSPModelProcessor.java:781) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor$SymbolContribAggregator.access$0(JSPModelProcessor.java:773) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.processSymbolContrib(JSPModelProcessor.java:534) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.processAttributes(JSPModelProcessor.java:524) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.recurseChildNodes(JSPModelProcessor.java:506) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.recurseChildNodes(JSPModelProcessor.java:507) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.recurseChildNodes(JSPModelProcessor.java:507) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.recurseChildNodes(JSPModelProcessor.java:507) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.refreshInternal(JSPModelProcessor.java:492) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.access$3(JSPModelProcessor.java:474) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor$RefreshRunnable.run(JSPModelProcessor.java:447) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2313) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.runOnCurrentThread(JSPModelProcessor.java:411) at org.eclipse.jst.jsf.designtime.internal.jsp.JSPModelProcessor.refresh(JSPModelProcessor.java:363) at org.eclipse.jst.jsf.designtime.internal.symbols.JSPTagVariableSymbolSourceProvider.getSymbols(JSPTagVariableSymbolSourceProvider.java:62) at org.eclipse.jst.jsf.designtime.context.DTJSPExternalContext.doGetMapForScope(DTJSPExternalContext.java:87) at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getMapForScope(AbstractDTExternalContext.java:46) at org.eclipse.jst.jsf.designtime.context.AbstractDTExternalContext.getRequestMap(AbstractDTExternalContext.java:64) at org.eclipse.jst.jsf.designtime.el.DefaultDTVariableResolver.resolveVariable(DefaultDTVariableResolver.java:67) at org.eclipse.jst.jsf.designtime.internal.symbols.ConfigBasedDTVariableResolver.resolveVariable(ConfigBasedDTVariableResolver.java:108) at org.eclipse.jst.jsf.designtime.resolver.SymbolContextResolver.getVariable(SymbolContextResolver.java:61) at org.eclipse.jst.jsf.core.internal.contentassist.el.SymbolResolveUtil.getSymbolForVariableSuffixExpr(SymbolResolveUtil.java:90) at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser$PrefixVisitor.getSymbolInfo(ContentAssistParser.java:185) at org.eclipse.jst.jsf.core.internal.contentassist.el.ContentAssistParser.getSymbolInfo(ContentAssistParser.java:83) at org.eclipse.jst.jsf.ui.internal.jspeditor.JSPSourceUtil.determineSymbolInfo(JSPSourceUtil.java:103) at org.eclipse.jst.jsf.ui.internal.jspeditor.JSFELHover.getHoverRegion(JSFELHover.java:65) at org.eclipse.jst.jsf.ui.internal.jspeditor.JSFELHover.getHoverRegion(JSFELHover.java:50) at org.eclipse.jst.jsf.facelet.ui.internal.hover.FaceletHover.getHoverRegion(FaceletHover.java:76) at org.eclipse.wst.sse.ui.internal.taginfo.BestMatchHover.getHoverRegion(BestMatchHover.java:183) at org.eclipse.jface.text.TextViewerHoverManager.computeInformation(TextViewerHoverManager.java:140) at org.eclipse.jface.text.AbstractInformationControlManager.doShowInformation(AbstractInformationControlManager.java:1131) at org.eclipse.jface.text.AbstractHoverInformationControlManager$MouseTracker.mouseHover(AbstractHoverInformationControlManager.java:519) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:208) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4486) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1388) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3831) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3441) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1151) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1032) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:148) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:636) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:579) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:135) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:236) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603) at org.eclipse.equinox.launcher.Main.run(Main.java:1465) at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
.project: ... <buildSpec> <buildCommand> <name>org.eclipse.jdt.core.javabuilder</name> </buildCommand> </buildSpec> <natures> <nature>org.eclipse.jdt.core.javanature</nature> </natures> </projectDescription> ComponentCore.createComponent(project) (line 129) returns null /* @return A handle to an IVirtualComponent that may or may not exist or * null if passed project does not contain ModuleCoreNature. */ ComponentCore#createComponent(IProject aProject, boolean checkForComponentFile) So I expect the following nature could help: <nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature> However, error handling in such a case is unacceptable. Expected: show dialog (or exception dialog) with information about missing nature.
I was able to get rid of the problem by adding of project nature <nature>org.eclipse.wst.common.modulecore.ModuleCoreNature</nature> and providing file .settings/org.eclipse.wst.common.component
