Name: mf23781 Date: 08/03/98


To reproduce take the following source code and follow the instructions:


jdb J11_3_2_Exceptions
stop in J11_3_2_Exceptions.main
run
issue next commands will hang jdb

//------J11_3_2_Exceptions.java--------

class J11_3_2_Exceptions {


 public static void main(String[] args) {

try {
System.out.println("main...");
TestJ11_3_2_MyThread oMyThread1 = new TestJ11_3_2_MyThread();
oMyThread1.start();
Thread.sleep(100); //Let the oMyThread1 run for a while
oMyThread1.stop(); //Put a breakpoint here, and stepover
//put another breakpoint at the catch(ThreadDeath) handler
//The "future" execution point will be the catch(ThreadDeath) handler
//Note: the catch handler may NOT be the immediate next step
}

catch (InterruptedException e) {
System.out.println("In main() catch interrupted...");
} //for Thread's sleep()
finally {
System.out.println("finally in main()...");
}
System.out.println("After finally in main()...");
 }

}

//------ TestJ11_3_2_MyThread.java--------


//Author: Henry Chiu
//Date: 19980216
//11.3.2
//An asynchronous exception is,
//by contrast, an exception that can
//potentially occur at any point in
//the execution of a Java program.
//Asynchronous exceptions are rare in Java. They occur only as a result of:
//· An invocation of the stop methods of class Thread ( §20.20.15, §20.20.16) or ThreadGroup ( §20.21.8, §20.21.9)
//· An InternalError (§11.5.2.2) in the Java Virtual Machine

class TestJ11_3_2_MyThread extends Thread {

public void run() {
try {
for(;;) System.out.println("Forever...");
}
catch (ThreadDeath e ) { //Consults 20.20.15 for detail
System.out.println("catch in Thread run()..."); // TC0001.1
throw e; //Consults 20.20.15 for detail
}
finally {
System.out.println("finally in Thread"); // TC0001.2

}
}

}

This appears to hang frequently on 1.1.7 and 1.2beta 4, but not
quite so frequently on 1.1.6.
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