A Boolean inside a subclass of a subclass of Thread is null when accessed from run().

["Kjetil S. Matheussen" <k dot s dot matheussen at notam02 dot no>]

This error is a bit weird, but hopefully I'm just doing something crazy.


When running the program posted at the end of this mail, I get the
following error:

"
kjetil@ttleush ~/hurtigmixer/src/boolbug $ kawa test.scm
isplaying=null
Exception in thread "Thread-1" java.lang.NullPointerException
        at AThread.getData(AThread.java:21)
        at BThread.run(AThread.java:9)
"



The weird thing about this is that the variable "isplaying" is a Boolean
initialized to false in the class AThread:
"private Boolean isplaying=true;"

(Needless to say, I don't get this error if just making an 
AThread instance from java instead of kawa.)

I can probably work around the error somehow, but any help would be
appreciated. Thanks.



Here is the java file called AThread.java stripped down as much as 
possible:
"
import java.util.*;
class BThread extends Thread{
    public void getData(){
    	System.out.println("I am not called");
    }
    public void run(){
	getData();
    }
    public BThread(){
	start();
    }
}
public class AThread extends BThread{
    private Boolean isplaying=true;
    public void getData(){
	System.out.println("isplaying="+isplaying);
	if(isplaying==true){
	    System.out.println("This is never displayed");
	}
    }
}
"

And here is my file test.scm:
"
(<AThread>)
"