Me and my partner installed from scratch eclipse with subclipse…But neither me or he can compare the files!!
Right Clicking a file >Compare with > Revision or anything we tried in order to make a comparison it failed and always will!
I get an error of java.lang.nullpointerexception and nothing more!
Here is what i get from the log

!ENTRY org.eclipse.jface 4 2
2010-11-20 04:36:28.653 !MESSAGE
Problems occurred when invoking code
from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.NullPointerException at
org.eclipse.php.internal.core.format.FormatPreferencesSupport.verifyValidity(FormatPreferencesSupport.java:100)
at
org.eclipse.php.internal.core.format.FormatPreferencesSupport.getIndentationChar(FormatPreferencesSupport.java:89)
at
org.eclipse.php.internal.ui.editor.configuration.PHPStructuredTextViewerConfiguration.getIndentPrefixes(PHPStructuredTextViewerConfiguration.java:448)
at
org.eclipse.wst.sse.ui.internal.StructuredTextViewer.configure(StructuredTextViewer.java:311)
at
org.eclipse.php.internal.ui.compare.MergeSourceViewer.configure(MergeSourceViewer.java:542)
at
org.eclipse.php.internal.ui.compare.TextMergeViewer$ContributorInfo.internalSetDocument(TextMergeViewer.java:546)
at
org.eclipse.php.internal.ui.compare.TextMergeViewer$ContributorInfo.setDocument(TextMergeViewer.java:434)
at
org.eclipse.php.internal.ui.compare.TextMergeViewer.updateContent(TextMergeViewer.java:2569)
at
org.eclipse.php.internal.ui.compare.ContentMergeViewer.internalRefresh(ContentMergeViewer.java:814)
at
org.eclipse.php.internal.ui.compare.ContentMergeViewer.inputChanged(ContentMergeViewer.java:704)
at
org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:274)
at
org.eclipse.compare.CompareViewerSwitchingPane.setInput(CompareViewerSwitchingPane.java:276)
at
org.eclipse.compare.internal.CompareContentViewerSwitchingPane.setInput(CompareContentViewerSwitchingPane.java:158)
at
org.eclipse.compare.CompareEditorInput.internalSetContentPaneInput(CompareEditorInput.java:844)
at
org.eclipse.compare.CompareEditorInput.access$8(CompareEditorInput.java:842)
at
org.eclipse.compare.CompareEditorInput$11.run(CompareEditorInput.java:785)
at
org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at
org.eclipse.compare.CompareEditorInput.feed1(CompareEditorInput.java:772)
at
org.eclipse.compare.CompareEditorInput.access$3(CompareEditorInput.java:771)
at
org.eclipse.compare.CompareEditorInput$5.open(CompareEditorInput.java:657)
at
org.eclipse.compare.CompareViewerPane.open(CompareViewerPane.java:325)
at
org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845)
at
org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at
org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
at
org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at
org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:843)
at
org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1131)
at
org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1235)
at
org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
at
org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
at
org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
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(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:619)
at
org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
at
org.eclipse.equinox.launcher.Main.run(Main.java:1407)