title: java.lang.NullPointerException when launching Eclipse
body: <p>I'm using Eclipse Juno and I get this error when I launch it on a certain workspace:</p>
  
  <blockquote>
    <p>An error has occurred. See error log for more details.</p>
    
    <p>java.lang.NullPointerException</p>
  </blockquote>
  
  <p>Other workspaces that are checked out from the same SVN repository work well. Does anyone know why this might happen?</p>
  
  <p>In the workspace log, I get the following exception:</p>
  
  <blockquote>
    <p>!ENTRY org.eclipse.m2e.logback.appender 4 0 2014-03-11 13:26:25.798
    !MESSAGE Could not add repository index</p>
    
    <p>!ENTRY org.eclipse.ui.workbench 4 2 2014-03-11 13:26:37.470
    !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".
    !STACK 0
    java.lang.NullPointerException
        at org.tigris.subversion.subclipse.ui.history.SVNHistoryPage$2.getElements(SVNHistoryPage.java:631)
        at org.eclipse.jface.viewers.StructuredViewer.getRawChildren(StructuredViewer.java:1010)
        at org.eclipse.jface.viewers.ColumnViewer.getRawChildren(ColumnViewer.java:703)
        at org.eclipse.jface.viewers.AbstractTableViewer.getRawChildren(AbstractTableViewer.java:1087)
        at org.eclipse.jface.viewers.StructuredViewer.getFilteredChildren(StructuredViewer.java:917)
        at org.eclipse.jface.viewers.StructuredViewer.getSortedChildren(StructuredViewer.java:1067)
        at org.eclipse.jface.viewers.AbstractTableViewer.internalRefreshAll(AbstractTableViewer.java:701)
        at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:649)
        at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:636)
        at org.eclipse.jface.viewers.AbstractTableViewer$2.run(AbstractTableViewer.java:592)
    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:353)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
        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:629)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1414)</p>
  </blockquote>