[SOLVED] Eclipse: Compare with -> Unhandled loop exception

I downloaded the Last Eclipse Helios Version and set it up to use it with GIT. I also downloaded and installed the last JAVA JRE8.

Everytime i want to compare a file with the GIT-Index (Right click on the file - Compare with - Git index) I get an eclipse exception and an 'Editor' pops up, with no content.

Is there something wrong with my installed Java or Eclipse?

I also cannot update eclipse using 'Help - Check for updates'...

Cannot complete the install because one or more required items could not be found.
  Software being installed: Eclipse Git Team Provider 3.3.2.201404171909-r (org.eclipse.egit.feature.group 3.3.2.201404171909-r)
  Missing requirement: Eclipse Git Team Provider 3.3.2.201404171909-r (org.eclipse.egit.feature.group 3.3.2.201404171909-r) requires 'org.eclipse.core.runtime [3.7.0,4.0.0)' but it could not be found

Message: Unhandled loop exception

org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
    at org.eclipse.swt.SWT.error(SWT.java:4083)
    at org.eclipse.swt.SWT.error(SWT.java:3998)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:137)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4041)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
    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)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1383)
Caused by: 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:778)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.compare.CompareEditorInput.feed1(CompareEditorInput.java:772)
    at org.eclipse.compare.CompareEditorInput.feedInput(CompareEditorInput.java:750)
    at org.eclipse.compare.CompareEditorInput.createContents(CompareEditorInput.java:554)
    at org.eclipse.compare.internal.CompareEditor.createCompareControl(CompareEditor.java:456)
    at org.eclipse.compare.internal.CompareEditor.access$6(CompareEditor.java:422)
    at org.eclipse.compare.internal.CompareEditor$3.run(CompareEditor.java:378)
    at org.eclipse.ui.internal.UILockListener.doPendingWork(UILockListener.java:164)
    at org.eclipse.ui.internal.UISynchronizer$3.run(UISynchronizer.java:158)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
    ... 23 more

eclipse.buildId=M20100909-0800
java.version=1.8.0_05
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_DE
Framework arguments:  -product org.eclipse.epp.package.php.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.php.product -clean