Is there a tool to discover if the same class exists in multiple jars in the classpath?

Question

If you have two jars in your classpath that contain different versions of the same class, the classpath order becomes critical.

I am looking for a tool that can detect and flag such potential conflicts in a given classpath or set of folders.

Certainly a script that starts:

classes=`mktemp`
for i in `find . -name "*.jar"`
do
    echo "File: $i" > $classes
    jar tf $i > $classes
    ...
done

with some clever sort/uniq/diff/grep/awk later on has potential, but I was wondering if anyone knows of any existing solutions.

Answer 1

Looks like jarfish will do what you want with its "dupes" command.