FIX: WJView Hangs with CPU Usage at 100% Using 315x VMs

ID: Q223355

The information in this article applies to:

SYMPTOMS

Running the below program causes the Microsoft virtual machine (Microsoft VM) to use 100 percent of the CPU's processing capacity. This process will hang the PC until it is terminated.


CAUSE

This is due to a bug found in builds 315x of the Microsoft VM's exception-handling logic.


RESOLUTION

Download and install the latest Microsoft VM from the following Web page:

http://www.microsoft.com/java/download.htm


STATUS

Microsoft has confirmed this to be a bug in Microsoft Win32 virtual machine Version 315x.


MORE INFORMATION

Steps to Reproduce Behavior

Compile and run the following code. On machines with virtual machines that contain this bug, the CPU usage on the machine will go to 100% and the Microsoft VM will hang. However, on a machine with a fixed virtual machine, the string "java.lang.Exception" will be output and the program will exit immediately. 

public class Test
{
 public static void main( String [] args )
 {
    Integer i = new Integer( 6 );
    synchronized( i )
    {
      if (true)
        throw new NullPointerException();
    }
 }
}


REFERENCES

For the latest Knowledge Base articles and other support information on Visual J++ and the SDK for Java, please see the following pages on the Microsoft Technical Support site:

http://support.microsoft.com/support/visualj/

http://support.microsoft.com/support/java/


© Microsoft Corporation 1999, All Rights Reserved.
Contributions by Adele Hunter, Microsoft Corporation

Additional query words: 


Keywords          : kbSDKJava kbVJ600fix 
Version           : WINDOWS:3.1,6.0
Platform          : WINDOWS 
Issue type        : kbbug

Last Reviewed: July 27, 1999