Re: Problem when trying to hotswap

Probably an older version of JSwat will have the same problem. It seems
that something has changed in the JVM, and is now indirectly causing
this exception. I have entered bug #740 to track this issue.

thanks

n


On Fri, 2003-03-21 at 03:15, Martin Kemp wrote:
> Nathan,
>  
> I'm trying to hotswap a class with jswat attached to a previously
> running VM, unfortunately I'm getting the following error:
>  
> > hotswap AssignPartNumber
> Error while running command.
> java.lang.NullPointerException
>  at
> com.bluemarsh.jswat.command.hotswapCommand.perform(hotswapCommand.java:90)
>  at
> com.bluemarsh.jswat.CommandManager.runCommand(CommandManager.java:853)
>  at
> com.bluemarsh.jswat.CommandManager.parseInputBase(CommandManager.java:778)
>  at
> com.bluemarsh.jswat.CommandManager.parseInput(CommandManager.java:668)
>  at
> com.bluemarsh.jswat.CommandManager.handleInput(CommandManager.java:440)
>  at
> com.bluemarsh.jswat.ui.graphical.GraphicalCommandAdapter.actionPerformed(GraphicalCommandAdapter.java:109)
>  at javax.swing.JTextField.fireActionPerformed(JTextField.java:489)
>  at javax.swing.JTextField.postActionEvent(JTextField.java:670)
>  at
> javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:784)
>  at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1512)
>  at javax.swing.JComponent.processKeyBinding(JComponent.java:2435)
>  at javax.swing.JComponent.processKeyBindings(JComponent.java:2470)
>  at javax.swing.JComponent.processKeyEvent(JComponent.java:2398)
>  at java.awt.Component.processEvent(Component.java:4902)
>  at java.awt.Container.processEvent(Container.java:1566)
>  at java.awt.Component.dispatchEventImpl(Component.java:3598)
>  at java.awt.Container.dispatchEventImpl(Container.java:1623)
>  at java.awt.Component.dispatchEvent(Component.java:3439)
>  at
> java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1688)
>  at
> java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:593)
>  at
> java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:765)
>  at
> java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:698)
>  at
> java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:559)
>  at java.awt.Component.dispatchEventImpl(Component.java:3468)
>  at java.awt.Container.dispatchEventImpl(Container.java:1623)
>  at java.awt.Window.dispatchEventImpl(Window.java:1585)
>  at java.awt.Component.dispatchEvent(Component.java:3439)
>  at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
>  at
> java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)
>  at
> java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
>  at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
>  at
> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
>  at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
>  
> I've tried it with the J2SE SDK 1.4.1_02 and _01. It used to work with
> the beta of 1.4.1, but for some reason does not now work. I've also
> tried it with jswat 2.12, .13 and .14. I'm just about to go back to an
> earlier version of jswat to see if that works.
>  
> The startup script I'm using is:
>  
> path=C:\j2sdk1.4.1_01\jre\bin;%path%
> set
> source_path=d:\kansas\src\kansas\kansas_common\kernel\java_gateway\java_examples;d:\kansas\src\kansas\kansas_common\kernel\java_gateway 
> rem set jar_path="d:\program files\jswat-2.13\jswat.jar"
> set jar_path="d:\program files\jswat-2.12\jswat.jar"
> set java_home=C:\j2sdk1.4.1_01
>  
> rem The javaw method 
> start javaw -Djava.ext.dirs=%java_home%\lib
> -Djava.source.path=%source_path% -jar %jar_path%
>  
> rem The console method
> rem java -Djava.ext.dirs=%java_home%\lib
> -Djava.source.path=%source_path% -jar %jar_path%
> 
>  
> If you have any ideas, or need to me to try anything else then please
> let me know.
>  
> Regards,
>  
> Martin Kemp