Eclipse Neon Error: Nullpointerexception when adding Lucene 6.6 dependencies to build path (org.eclipse.jface)

Question

I'm developing with lucene 6.6 in eclipse neon 3 and when i add different lucene jars (e.g. lucene-6.6.0-core.jar) to the build path of my project i get a popup with a nullpointerexception. It then happens everytime i select the project or content within it. Confusingly my error log is not mentioning lucene but a plugin called "org.eclipse.jface":

!ENTRY org.eclipse.jface 4 2 2017-07-17 10:29:55.989 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface". !STACK 0 java.lang.NullPointerException at org.eclipse.jst.jee.ui.internal.navigator.web.WebAppProvider.getImage(WebAppProvider.java:99) at org.eclipse.jst.jee.ui.internal.navigator.Web25LabelProvider.getImage(Web25LabelProvider.java:47) at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.findImage(NavigatorContentServiceLabelProvider.java:199) at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getColumnImage(NavigatorContentServiceLabelProvider.java:107) at org.eclipse.ui.internal.navigator.NavigatorContentServiceLabelProvider.getImage(NavigatorContentServiceLabelProvider.java:99) at org.eclipse.ui.internal.navigator.NavigatorDecoratingLabelProvider$StyledLabelProviderAdapter.getImage(NavigatorDecoratingLabelProvider.java:57) at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.getImage(DelegatingStyledCellLabelProvider.java:195) at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.getImage(DecoratingStyledCellLabelProvider.java:168) at org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.update(DelegatingStyledCellLabelProvider.java:121) at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider.update(DecoratingStyledCellLabelProvider.java:131) at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:141) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:949) at org.eclipse.jface.viewers.AbstractTreeViewer$UpdateItemSafeRunnable.run(AbstractTreeViewer.java:118) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:1029) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:474) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:50) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173) at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2170) at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:843) at org.eclipse.jface.viewers.AbstractTreeViewer.createAddedElements(AbstractTreeViewer.java:416) at org.eclipse.jface.viewers.AbstractTreeViewer.internalAdd(AbstractTreeViewer.java:285) at org.eclipse.jface.viewers.TreeViewer.internalAdd(TreeViewer.java:615) at org.eclipse.jface.viewers.AbstractTreeViewer.add(AbstractTreeViewer.java:160) at org.eclipse.ui.navigator.CommonViewer.add(CommonViewer.java:302) at org.eclipse.jst.j2ee.navigator.internal.ClearPlaceHolderJob.runInUIThread(ClearPlaceHolderJob.java:42) at org.eclipse.jst.jee.ui.internal.navigator.ClearJeePlaceHolderJob.runInUIThread(ClearJeePlaceHolderJob.java:32) at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:97) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4211) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3827) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150) at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138) 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:388) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610) at org.eclipse.equinox.launcher.Main.run(Main.java:1519)

Is this a bug in eclipse or lucene? I found other topics about this plubing but it didn't help me a lot. Of course i tried things like cleaning the project etc. Does anyone know how i can solve this? I am in badly need to continue my development of my lucene app.

Answer 1

Ok, it seems like this problem was the consequence of another problem in my project: Eclipse could not load the project descriptor, because the web.xml had an error. Since i fixed this the other error is also gone.