Microsoft KB Archive/182890

= PRB: Problems Using ASP Intrinsic Objects in Java Components =

Article ID: 182890

Article Last Modified on 3/16/2005

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APPLIES TO


 * Microsoft Active Server Pages 1.0
 * Microsoft Internet Information Server 4.0
 * Microsoft Internet Information Services 5.0

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This article was previously published under Q182890



SYMPTOMS
When overriding OnStartPage and OnEndPage in Active Server Pages (ASP) components written in Java, you may encounter problems when using ASP intrinsic object interfaces. In particular, if your component stores references to the intrinsic objects in the Java class, the Inetinfo process may stop after the call to OnEndPage if more than one copy of your component is currently in use.



CAUSE
This problem is caused by a combination of the way ASP manipulates its intrinsic objects and of the way the Virtual Machine for Java cleans up references to COM interfaces. After OnEndPage is called, ASP assumes it is safe to remove the intrinsic objects such as the Session object. Because of the way Java's garbage collection routines work, it is possible that the Virtual Machine for Java will attempt to release the interface after ASP has already removed it. Such an attempt will cause a GP Fault that can stop the Inetinfo process.



RESOLUTION
In order to avoid this problem, you should use the ComLib.release to force the Virtual Machine for Java to do an immediate release on the intrinsic object interface pointers you are using. This prevents the delay that is typically present when garbage collection is used to release the interfaces.

Here's an example: import com.ms.com.*;

. . . . ..

public void OnEndPage {

//Force immediate release of the Response interface member ComLib.release(my_response); my_response   = null;

}

Keywords: kbaspobj kbjava kbprb KB182890

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