[DrJava] [ drjava-Bugs-788311 ] NullPointer when saving history

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Bugs item #788311, was opened at 2003-08-13 20:18
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Category: Interactions
Group: Serious
Status: Open
Resolution: None
Priority: 5
Submitted By: Charles Reis (csreis)
Assigned to: Nobody/Anonymous (nobody)
Summary: NullPointer when saving history

Initial Comment:
The following steps will cause a NullPointerException
in drjava-20030812-2156, WinXP, JDK 1.4.2:

 - Start DrJava
 - Enter "int x = 3;" into Interactions
 - Right-click, "Save History"
 - Edit before saving, click Save
 - Save as "hist1"
 - Right-click, "Load History as Script"
    (Note: just clicking Open will cause an
IOException, since "hist1" is selected, not "hist1.hist")
 - Choose hist1.hist
 - Right-click, "Save History"
 - Edit before saving, click Save
 - Change "hist1.hist" to "hist2.hist" and click Save

A NullPointerException will be thrown:

java.lang.RuntimeException: filechooser returned null file
	at
edu.rice.cs.drjava.ui.MainFrame.getChosenFile(MainFrame.java:2357)
	at
edu.rice.cs.drjava.ui.MainFrame.access$4700(MainFrame.java:95)
	at
edu.rice.cs.drjava.ui.MainFrame$64.getFile(MainFrame.java:1122)
	at
edu.rice.cs.drjava.model.repl.History.writeToFile(History.java:237)
	at
edu.rice.cs.drjava.model.repl.InteractionsDocument.saveHistory(InteractionsDocument.java:209)
	at
edu.rice.cs.drjava.model.DefaultGlobalModel.saveHistory(DefaultGlobalModel.java:922)
	at
edu.rice.cs.drjava.ui.MainFrame$63.actionPerformed(MainFrame.java:1137)
	at
javax.swing.AbstractButton.fireActionPerformed(Unknown
Source)
	at
javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown
Source)
	at
javax.swing.DefaultButtonModel.fireActionPerformed(Unknown
Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown
Source)
	at javax.swing.AbstractButton.doClick(Unknown Source)
	at
javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown
Source)
	at
javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(Unknown
Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown
Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at
java.awt.LightweightDispatcher.retargetMouseEvent(Unknown
Source)
	at
java.awt.LightweightDispatcher.processMouseEvent(Unknown
Source)
	at
java.awt.LightweightDispatcher.dispatchEvent(Unknown
Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown
Source)
	at
java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)


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