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IDE was giving me problem (Look Issue Id 50121) so I removed "build" foder (Which was created by IDE in my source folders) and NetBeans 4.0 Beta. I clicked on Run Main Project icon (index.jsp). I got the following error: ================================================== ============================================== java.lang.IllegalStateException: Duplicate pair in treePair1: SL[/Browsers/SwingBrowser pair2: SL [/Browsers/SwingBrowser index1: 6 index2: 6 item1: org.netbeans.core.ui.SwingBrowser@16be535 item2: org.netbeans.core.ui.SwingBrowser@16be535 id1: 9530a5 id2: acb67a at org.openide.util.lookup.ALPairComparator.compare (ALPairComparator.java:52) at java.util.TreeMap.compare (TreeMap.java:1085) at java.util.TreeMap.put(TreeMap.java:463) at java.util.TreeSet.add(TreeSet.java:209) at org.openide.util.lookup.AbstractLookup$R.initItems (AbstractLookup.java:788) at org.openide.util.lookup.AbstractLookup$R.allItemsW ithoutBeforeLookup(AbstractLookup.java:749) at org.openide.util.lookup.AbstractLookup$R.allInstan ces(AbstractLookup.java:691) at org.openide.util.lookup.ProxyLookup$R.computeResul t(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstances (ProxyLookup.java:329) at org.openide.util.lookup.ProxyLookup$R.computeResul t(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstances (ProxyLookup.java:329) at org.netbeans.core.IDESettings.getWWWBrowser (IDESettings.java:345) at org.netbeans.core.NbTopManager$NbBrowser.<init> (NbTopManager.java:613) [catch] at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:178) at java.awt.EventQueue.dispatchEvent (EventQueue.java:454) at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:145) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:137) at java.awt.EventDispatchThread.run (EventDispatchThread.java:100) ================================================== ============================================== Annotation: Exception during initialization of HTML browser module java.lang.IllegalStateException: Duplicate pair in treePair1: SL[/Browsers/SwingBrowser pair2: SL [/Browsers/SwingBrowser index1: 6 index2: 6 item1: org.netbeans.core.ui.SwingBrowser@16be535 item2: org.netbeans.core.ui.SwingBrowser@16be535 id1: 9530a5 id2: acb67a at org.openide.util.lookup.ALPairComparator.compare (ALPairComparator.java:52) at java.util.TreeMap.compare (TreeMap.java:1085) at java.util.TreeMap.put(TreeMap.java:463) at java.util.TreeSet.add(TreeSet.java:209) at org.openide.util.lookup.AbstractLookup$R.initItems (AbstractLookup.java:788) at org.openide.util.lookup.AbstractLookup$R.allItemsW ithoutBeforeLookup(AbstractLookup.java:749) at org.openide.util.lookup.AbstractLookup$R.allInstan ces(AbstractLookup.java:691) at org.openide.util.lookup.ProxyLookup$R.computeResul t(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstances (ProxyLookup.java:329) at org.openide.util.lookup.ProxyLookup$R.computeResul t(ProxyLookup.java:378) at org.openide.util.lookup.ProxyLookup$R.allInstances (ProxyLookup.java:329) at org.openide.awt.HtmlBrowser.findComponent (HtmlBrowser.java:226) 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) [catch] at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:178) at java.awt.EventQueue.dispatchEvent (EventQueue.java:454) at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:145) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:137) at java.awt.EventDispatchThread.run (EventDispatchThread.java:100) ================================================== ================================================== === java.lang.NullPointerException at org.openide.awt.HtmlBrowser.<init> (HtmlBrowser.java:205) at org.netbeans.core.HtmlBrowserComponent.<init> (HtmlBrowserComponent.java:83) at org.netbeans.core.NbTopManager$NbBrowser.<init> (NbTopManager.java:613) [catch] at org.netbeans.core.NbTopManager$1.run (NbTopManager.java:328) at java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:178) at java.awt.EventQueue.dispatchEvent (EventQueue.java:454) at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:151) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:145) at java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:137) at java.awt.EventDispatchThread.run (EventDispatchThread.java:100) ================================================== ================================================== ===
*** This issue has been marked as a duplicate of 50190 ***
*** Issue 51360 has been marked as a duplicate of this issue. ***
closed duplicate