Re: need help about code mobility

Mark Zaini wrote:
> I have a exception with JVM I don't believe who I have problems
> with Apache(because I made a test without inheritance between A and B )
> the exception is :java.lang.NoClassDefFoundError: class B

> I think that the problem is with the resolution of the hierarchy
> What do you think?
> Thank you very much for the explanations,Mark.

Right, I used 'C' in my example instead of 'B'.  I would suggest that you put
these classes into a jar file (B and its dependents) and then place that jar
file into your web server directory under /remoteclasses.  If you call that jar
file "server.jar", then you should be able to use your web browser to download
the jar as  "http://myhost:80/remoteclasses/server.jar".  That same URL is what
you should use in your URL classloader.

Loading classes from a directory structure usually creates these kinds of
problems until you have fully understood package naming vs directory hierarchies
and have a sane configuration.

When you compile your class files do this

        javac -d classes *.java

then do

        cd classes
        jar cvf ../server.jar .

to create the correct jar structure given the packaging you are using.

Then put that server.jar into the director that the /remoteclasses alias points at.

Change your URL in the classloader construction and try it again.

Gregg Wonderly

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