[Sablevm-bugs] [ sablevm-Bugs-923922 ] Runtime.addShutdownHook: NullPointerException

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Bugs item #923922, was opened at 2004-03-26 10:03
Message generated for change (Comment added) made by davidbelanger
You can respond by visiting: 
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Category: Execution Problem
Group: SableVM
Status: Open
Resolution: None
Priority: 5
Submitted By: Laurent Martelli (laurentmartelli)
Assigned to: Nobody/Anonymous (nobody)
Summary: Runtime.addShutdownHook: NullPointerException

Initial Comment:
java.lang.ExceptionInInitializerError
   at java.lang.VMClass.initialize (VMClass.java:140)
   at java.lang.Class.initialize (Class.java:163)
   at java.lang.reflect.Method.invokeNative (Method.java)
   at java.lang.reflect.Method.invoke (Method.java:552)
   at org.objectweb.jac.core.JacLoader.run
(JacLoader.java:570)
   at org.objectweb.jac.core.Jac.main (Jac.java:321)
   at java.lang.VirtualMachine.invokeMain
(VirtualMachine.java)
   at java.lang.VirtualMachine.main
(VirtualMachine.java:88)
Caused by: java.lang.NullPointerException
   at java.lang.Thread.isAlive (Thread.java:601)
   at java.lang.Runtime.addShutdownHook (Runtime.java:351)
   at org.objectweb.jac.core.ACManager.static{}
(ACManager.java:89)
   at java.lang.VMClass.step8 (VMClass.java)
   at java.lang.VMClass.initialize (VMClass.java:126)
   ...7 more

ACManager reads:

    static {
        Runtime.getRuntime().addShutdownHook(
            new Thread() {
                    public void run() {
                        if (acManager!=null) {
                            logger.info("JAC system
shutdown: notifying all ACs...");
                            acManager.onExit();
                        }
                        logger.info("Bye bye.");
                    }
                }
        );
   }


Changig Thread.javaline 601 to be like this:

    return vmThread != null && vmThread.isAlive();

fixes the problem for me.

----------------------------------------------------------------------

Comment By: David Bélanger (davidbelanger)
Date: 2004-03-26 21:27

Message:
Logged In: YES 
user_id=694080


This has now been fixed in staging.

David

----------------------------------------------------------------------

Comment By: David Bélanger (davidbelanger)
Date: 2004-03-26 16:56

Message:
Logged In: YES 
user_id=694080


Hi,

This is the correct fix.  I also fixed a similar bug.

The fixes will get into SableVM/staging branch later today.

Thank you for reporting this bug.

David

----------------------------------------------------------------------

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