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Servlet Container Exception Handling

Posted on 2011-09-06
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Last Modified: 2012-05-12
Hello,

I have a J2EE application running on Tomcat 7 with log4j implemented.  I wanted to create a custom error page whenever my application encounters an Exception.  I created something similar to ex #1 below in my web.xml, but I was wondering If I can just catch all errors.  I don't think its possible since 500 is java.lang.Throwable and wont get caught if I try to use and exception-type condition (see #2 below).  

ex#1
<error-page>
    <error-code>404</error-code>
    <location>/errors/error.jsp</location>
<error-code>500</error-code>
    <location>/errors/error.jsp</location>
</error-page> 

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ex#2
<error-page>
    <exception-type>java.lang.Exception</exception-type>
    <location>/errors/error.jsp</location>  
</error-page> 

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Question by:cgray1223
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3 Comments
 
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Accepted Solution

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for_yan earned 500 total points
ID: 36492523


perhpas this solution can help you:
http://www.coderanch.com/t/492765/Servlets/java/Exception-Handling-Servlets


      
posted Saturday, April 24, 2010 2:02:26 AM private message
Quote
If you wrap your MyException in a ServletException declare the ServletException in your web.xml file

Example:



    catch(MyException e)    
    {    
        throw new ServletException(e)  
    }  



web.xml file:


      <error-page>  
       <exception-type>javax.servlet.ServletException</exception-type>  
       <location>/error/error.jsp</location>  
      </error-page>  

also read some stuff below in that link
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Author Comment

by:cgray1223
ID: 36497172
Thanks for the response.  That would work for all exceptions I'm expecting, but not for 404s or runtime exceptions that are not trapped.  I don't think I can trap every error that could ever occur...thoughts?
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LVL 47

Expert Comment

by:for_yan
ID: 36497380
Yes, I think you are right - you cannot trap every error that could ever occurs - there will be alwyas something which you had not anticipated
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