Re: [Php-java-bridge-users] How to debug NoClassDefFoundError exceptions?

I saw similar behaviour when I first set up the Java-Bridge.  If Module A 
called a function in Module B.  And the function in Module B needed a jar 
for a call in Module B.  I assumed that I could include the jar in Module 
B only.  But I found that I needed to include it in Module A as well. Once 
I saw it, it was not a big problem, but determining what was happening was 
frustrating.  Now I just put everything in the ext directory and it is 
simpler.  Everything loads statically on startup.

Charles Shaffer
Senior Analyst
NTN-Bower Corporation




php...@li...
12/12/2008 04:10 PM
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        Subject:        Re: [Php-java-bridge-users] How to debug NoClassDefFoundError exceptions?


Thanks for your reply.

After re-reading the FAQ thoroughly, I made several experiments to see
the bridge's reaction to placing the jars in different places. What I
found is this:

I had given a *relative* path for each jar to java_autoload. It loaded
them successfully, and I was able to *explicitly* instantiate classes
from all those autoloaded jars. However, if a Java class A tried to
instantiate a class B located in another jar, it ran the risk of not
finding the appropriate jar (even though, again, PHP was able to
instantiate B). What I mean by "risk" is that loading only sometimes
failed. When I specified the *absolute* paths for the jars, the
problem went away.

I would humbly suggest to document this behaviour in the FAQ, or to
fix the bridge such that the VM's class loader behaves just like
java_require.

Thanks,
K.

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