[DrJava] [ drjava-Bugs-1022110 ] Null Pointer Exception.

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Bugs item #1022110, was opened at 2004-09-03 14:36
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Null Pointer Exception.

Initial Comment:
This error happens randomly, while attempting to compile.
Can you help?

java.lang.NullPointerException
	at java.util.LinkedList.remove(LinkedList.java:648)
	at java.util.LinkedList.remove(LinkedList.java:221)
	at
edu.rice.cs.drjava.model.cache.DocumentCache.updatelru(DocumentCache.java:162)
	at
edu.rice.cs.drjava.model.cache.DocumentCache.get(DocumentCache.java:107)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel$ConcreteOpenDefDoc.getDocument(DefaultGlobalModel.java:2502)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel$ConcreteOpenDefDoc.isModifiedSinceSave(DefaultGlobalModel.java:2979)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel$5.toString(DefaultGlobalModel.java:1067)
	at
javax.swing.DefaultListCellRenderer.getListCellRendererComponent(DefaultListCellRenderer.java:98)
	at
javax.swing.plaf.basic.BasicListUI.updateLayoutState(BasicListUI.java:1134)
	at
javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(BasicListUI.java:1084)
	at
javax.swing.plaf.basic.BasicListUI$Handler.valueChanged(BasicListUI.java:2200)
	at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:187)
	at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
	at
javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:214)
	at
javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:408)
	at
javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:417)
	at
javax.swing.DefaultListSelectionModel.removeSelectionIntervalImpl(DefaultListSelectionModel.java:510)
	at
javax.swing.DefaultListSelectionModel.clearSelection(DefaultListSelectionModel.java:422)
	at javax.swing.JList.clearSelection(JList.java:1578)
	at javax.swing.JList.setModel(JList.java:1216)
	at javax.swing.JList.setListData(JList.java:1247)
	at
edu.rice.cs.util.docnavigation.JListSortNavigator.refreshDocument(JListSortNavigator.java:208)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel$ConcreteOpenDefDoc.saveFileAs(DefaultGlobalModel.java:2781)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel$ConcreteOpenDefDoc.saveFile(DefaultGlobalModel.java:2684)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel.saveAllFiles(DefaultGlobalModel.java:1286)
	at
edu.rice.cs.drjava.model.DefaultSingleDisplayModel.saveAllFiles(DefaultSingleDisplayModel.java:319)
	at
edu.rice.cs.drjava.ui.MainFrame._saveAll(MainFrame.java:2934)
	at
edu.rice.cs.drjava.ui.MainFrame.access$2600(MainFrame.java:105)
	at
edu.rice.cs.drjava.ui.MainFrame$ModelListener._saveAllBeforeProceeding(MainFrame.java:6392)
	at
edu.rice.cs.drjava.ui.MainFrame$ModelListener.saveBeforeCompile(MainFrame.java:6310)
	at
edu.rice.cs.drjava.model.GlobalEventNotifier.saveBeforeCompile(GlobalEventNotifier.java:599)
	at
edu.rice.cs.drjava.model.compiler.CompilerEventNotifier.saveBeforeCompile(CompilerEventNotifier.java:127)
	at
edu.rice.cs.drjava.model.compiler.DefaultCompilerModel.compile(DefaultCompilerModel.java:330)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel$ConcreteOpenDefDoc.startCompile(DefaultGlobalModel.java:2871)
	at
edu.rice.cs.drjava.ui.MainFrame$100.construct(MainFrame.java:3210)
	at
edu.rice.cs.util.swing.SwingWorker$2.run(SwingWorker.java:157)
	at java.lang.Thread.run(Thread.java:595)


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