Question

Java Web Server Error 500 - filter unavailable.

Asked by: doppenheim

I'm getting the following error (this is the complete error) trying to use my Web App.

Error 500: Filter [CmpRunningFilter]: filter is unavailable.

The app has been working, but I'm suddenly getting this error.

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Asked On
2007-09-24 at 07:34:43ID22848360
Tags

filter

,

error

,

unavailable

,

500

Topics

Java Servlets

,

Java Server Pages (JSP)

,

Sun Java System Web Server

Participating Experts
3
Points
500
Comments
10

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Answers

 

by: Ajay-SinghPosted on 2007-09-24 at 08:48:34ID: 19949243

Do you see any error on the catalina.out? or any while while the application
getting initialized?

 

by: doppenheimPosted on 2007-09-25 at 05:53:41ID: 19955263

Sorry it took so long to reply - I'm new to the exchange and had to ask for help on how to respond.

We're using WebSphere - but there does not appear to be any errors.  It doesn't look like there are any app initialization errors.  However, reading our application logs, the filter (the one that we get a message about being unavailable) does catch and handle a null pointer exception.  After catching the exception the code is supposed to continue.

 

by: rrz@871311Posted on 2007-09-25 at 07:59:05ID: 19956256

Can you show us the Filter code ?

 

by: Ajay-SinghPosted on 2007-09-25 at 08:31:28ID: 19956563

> does catch and handle a null pointer exception.
 
May be some other exception is getting raised...

 

by: doppenheimPosted on 2007-09-26 at 10:36:27ID: 19964946

The filter does some logic and then does one of two things:
 chain.doFilter(req,res);
or session. getServletContext(). getRequestDispatcher("/ea/jsp/cmpBusy.jsp").forward(req,res);
The "unavailable" error was happening when the second option (the forward) was taken.  Further up in the code, we were doing a flushBuffer on the response object.  Further testing showd the filter was in an "illegal" state.  Commenting out the flushBuffer seems to have fixed the problem.  Can anyone explain?  I believe we are runnng on WebSphere servers.      

 

by: rrz@871311Posted on 2007-09-26 at 16:54:44ID: 19967855

A call to the flushBuffer method automatically commits the response, meaning the status code and headers will be written. You can't forward after doing so.

 

by: doppenheimPosted on 2007-09-27 at 06:11:03ID: 19970799

rrz - thanks for the response.  Can you elaborate further?  When you say "headers will be written" do you mean they are actually delivered to the caller's browser or do you mean they are inserted into the stream that will eventually be returned to the caller's browser.

 

by: rrz@871311Posted on 2007-09-27 at 07:22:09ID: 19971383

>do you mean they are actually delivered to the caller's browser    
Yes.  
If you do a forward, then the buffer is cleared and the destination page starts fresh.

 

by: Computer101Posted on 2007-10-28 at 17:43:54ID: 20166988

Forced accept.

Computer101
EE Admin

20120131-EE-VQP-002

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