Classloader issues - How to determine which library versions (jar-files) are loaded
classloader, jar, java
Solution
If you happen to be using JBoss, there is an MBean (the class loader repository iirc) where you can ask for all classloaders that have loaded a certain class.
If all else fails, there's always `java -verbose:class` which will print the location of the jar for every class file that is being loaded.
Problem
I've just solved another *I-though-I-was-using-this-version-of-a-library-but-apparently-my-app-server-has-already-loaded-an-older-version-of-this-library-*issue (sigh). Does anybody know a good way to verify (or monitor) whether your application has access to all the appropriate jar-files, or loaded class-versions? Thanks in advance! [P.S. A very good reason to start using the OSGi module architecture in my view!] Update: This article helped as well! It gave me insight which classes JBoss' classloader loaded by writing it to a log file.