Pid, A late comment on this thread.
On 9/25/2010 10:10 AM, Pid wrote: > A user asked if it was possible for Tomcat to > detect duplicate classes in the classpath and report which jar they were in. I suppose Tomcat could be instructed to do this, but it would have to step outside of the ClassLoader scheme and do everything manually: 1. Enumerate all the JAR files that would be in the ClassLoader's classpath 2. Open each JAR file (probably using java.util.Zip) 3. Scan each file and take a fingerprint (file length + SHA1 hash?, or is it enough to just have the same FQCN?) 4. Compare all fingerprints You can't use a ClassLoader directly because it will find the first matching Class and ignore the rest. It also won't provide anything that you can fingerprint (except maybe a list of methods/fields/etc.). -chris
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