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I get an error when running a web application. Here is an error log: *********** Exception occurred ************ at 8:13 PM on Oct 11, 2004 java.lang.NullPointerException at org.openide.awt.HtmlBrowser.<init> (HtmlBrowser.java:205) at org.netbeans.core.HtmlBrowserComponent.<init> (HtmlBrowserComponent.java:83) at org.netbeans.core.NbTopManager$NbBrowser.<init> (NbTopManager.java:613) at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent (EventQueue.java:461) [catch] at java.awt.EventDispatchThread.pumpOneEventForHiera rchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarc hy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:149) at java.awt.EventDispatchThread.run (EventDispatchThread.java:110) *********** Exception occurred ************ at 8:14 PM on Oct 11, 2004 java.lang.IllegalStateException: Duplicate pair in treePair1: SL[/Browsers/NetscapeBrowser pair2: SL[/Browsers/NetscapeBrowser index1: 4 index2: 4 item1: org.netbeans.modules.extbrowser.NetscapeBrowser@1 ab6087 item2: org.netbeans.modules.extbrowser.NetscapeBrowser@1 ab6087 id1: 387bc2 id2: 4507ed at org.openide.util.lookup.ALPairComparator.compare (ALPairComparator.java:52) at java.util.TreeMap.compare (TreeMap.java:1093) at java.util.TreeMap.put (TreeMap.java:465) at java.util.TreeSet.add (TreeSet.java:210) at org.openide.util.lookup.AbstractLookup$R.initItem s(AbstractLookup.java:788) at org.openide.util.lookup.AbstractLookup$R.allItems WithoutBeforeLookup(AbstractLookup.java:749) at org.openide.util.lookup.AbstractLookup$R.allInsta nces(AbstractLookup.java:691) at org.openide.util.lookup.ProxyLookup$R.computeResu lt(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstance s(ProxyLookup.java:329) at org.openide.util.lookup.ProxyLookup$R.computeResu lt(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstance s(ProxyLookup.java:329) [catch] at org.netbeans.core.IDESettings.getWWWBrowser (IDESettings.java:345) at org.netbeans.core.NbTopManager$NbBrowser.<init> (NbTopManager.java:613) at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent (EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHiera rchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarc hy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:149) at java.awt.EventDispatchThread.run (EventDispatchThread.java:110) *********** Exception occurred ************ at 8:14 PM on Oct 11, 2004 Annotation: Exception during initialization of HTML browser module java.lang.IllegalStateException: Duplicate pair in treePair1: SL[/Browsers/NetscapeBrowser pair2: SL[/Browsers/NetscapeBrowser index1: 4 index2: 4 item1: org.netbeans.modules.extbrowser.NetscapeBrowser@1 ab6087 item2: org.netbeans.modules.extbrowser.NetscapeBrowser@1 ab6087 id1: 387bc2 id2: 4507ed at org.openide.util.lookup.ALPairComparator.compare (ALPairComparator.java:52) at java.util.TreeMap.compare (TreeMap.java:1093) at java.util.TreeMap.put (TreeMap.java:465) at java.util.TreeSet.add (TreeSet.java:210) at org.openide.util.lookup.AbstractLookup$R.initItem s(AbstractLookup.java:788) at org.openide.util.lookup.AbstractLookup$R.allItems WithoutBeforeLookup(AbstractLookup.java:749) at org.openide.util.lookup.AbstractLookup$R.allInsta nces(AbstractLookup.java:691) at org.openide.util.lookup.ProxyLookup$R.computeResu lt(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstance s(ProxyLookup.java:329) at org.openide.util.lookup.ProxyLookup$R.computeResu lt(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstance s(ProxyLookup.java:329) at org.openide.awt.HtmlBrowser.findComponent (HtmlBrowser.java:226) [catch] at org.openide.awt.HtmlBrowser.<init> (HtmlBrowser.java:173) at org.netbeans.core.HtmlBrowserComponent.<init> (HtmlBrowserComponent.java:83) at org.netbeans.core.NbTopManager$NbBrowser.<init> (NbTopManager.java:613) at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent (EventQueue.java:461) at java.awt.EventDispatchThread.pumpOneEventForHiera rchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarc hy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:149) at java.awt.EventDispatchThread.run (EventDispatchThread.java:110) *********** Exception occurred ************ at 8:14 PM on Oct 11, 2004 java.lang.NullPointerException at org.openide.awt.HtmlBrowser.<init> (HtmlBrowser.java:205) at org.netbeans.core.HtmlBrowserComponent.<init> (HtmlBrowserComponent.java:83) at org.netbeans.core.NbTopManager$NbBrowser.<init> (NbTopManager.java:613) at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent (EventQueue.java:461) [catch] at java.awt.EventDispatchThread.pumpOneEventForHiera rchy(EventDispatchThread.java:234) at java.awt.EventDispatchThread.pumpEventsForHierarc hy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:149) at java.awt.EventDispatchThread.run (EventDispatchThread.java:110)
*** This issue has been marked as a duplicate of 48590 ***