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From Berin Loritsch <blorit...@apache.org>
Subject Re: The end of the infamous endorsed libs problem : ParanoidCocoonServlet now really paranoid
Date Tue, 03 Jun 2003 14:00:23 GMT
Vadim Gritsenko wrote:
> Sylvain Wallez wrote:
> 
>> Hi all,
>>
>> Short story : once again, I've hit the famous endorsed library 
>> problem. So as usual I copied Cocoon's Xalan and Xerces to 
>> tomcat/common/endorsed, but unfortunately this broke another 
>> application that was running in the same Tomcat.
>>
>> Damn. How to solve this ? Install another Tomcat ? Yeah, it will work, 
>> but will add yet-another-JVM to the server, which I wanted to avoid. 
>> So, I decided to use ParanoidCocoonServlet, and discovered that it was 
>> actually not paranoid at all because it was not using the 
>> ParanoidClassLoader it was supposed to use :-(
>>
>> So I refactored a bit all our servlets and now ParanoidCocoonServlet 
>> is _really_ paranoid. This means, that its classloader will _always_ 
>> try to load classes and resources first from WEB-INF/lib and 
>> WEB-INF/classes, ignoring any similar classes existing in the parent 
>> classloader. Xalan, Xerces, etc are now really immune to whatever 
>> version of the same library can exist either in the JDK or in the 
>> servlet engine.
>>
>> Such a strong shielding can have some drawbacks, however : if a class 
>> is given by the servlet engine (e.g. a JNDI context) and the same 
>> class exists in the webapp libs (e.g. in jndi.jar), then you're very 
>> likely to get a ClassCastException. This is likely to happen mostly 
>> with standard APIs, and the solution is then to remove the offending 
>> library from your WEB-INF/lib. 


Oh good.  You fixed all the problems I was having.


-- 
"You know the world is going crazy when the best
rapper is a white guy, the best golfer is a black guy,
The Swiss hold the America's Cup, France is
accusing the US of arrogance, and Germany doesn't want
to go to war. And the 3 most powerful men in America
are named 'Bush', 'Dick', and 'Colon' (sic)".

-----Chris Rock


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