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From <>
Subject Re: [T4m4] java.lang.SecurityException
Date Thu, 09 Nov 2000 23:14:07 GMT
> wrote:
>> I am trying to run T4m4 with my webapp and I am receiving a
>> java.lang.SecurityException : sealing exception
>> This is because my servlet is trying to instantiate a singleton object
>> in the webapp that reads its config info from a file on the classpath
>> using a mildy modified version of the XML mapper from Tomcat (just
>> renamed the package so I can use it).
>> I was under the assumption that the security stuff didn't run if you
>> just ran bin/  Is that still the case?
> "Sealing violation" problems just started showing up in m4.  The only
> thing I can think of that's different is I compiled with optimization
> on, but it's still under investigation.  As I understand it, a sealing
> violation means you're trying to load a class in a particular package
> from a different JAR file than other classes of that same package were
> found.
> One issue you might run into with the "modified XML mapper" is that, if
> the mapper classes themselves are on the system class path, they won't
> be able to see classes in WEB-INF/classes or WEB-INF/lib/*.jar -- class
> loader delegation goes up the hierarchy, but not down.  You might need
> to ensure that all your classes are under WEB-INF (or all your classes
> are on the classpath) to make this work.
> I ran into exactly this situation with the Digester module in Struts
> <>, which is pretty similar in
> principle to XmlMapper, and it is one of the reasons for the
> restriction that struts.jar *must* be in your WEB-INF/lib directory.

Thanks, Craig.  All of my code is in either WEB-INF/classes or WEB-
INF/lib.  One thing I have noted to do in ALL of my java development is to 
NEVER specify a classpath in my environment.  I always make the program 
invoke using its needed classpath.  Less ambiguity that way ;-)

I'll keep looking ;-)

Scott Sanders

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