How to compile a java class in Oracle database

The short answer is:

alter java class "java class name" resolve;

For example: alter java class "/e6bc455_DocumentGenerator" resolve;

The long answer is given in the post titled "Long road to loadjava" in Frederic Tang's blog.

The following metalink notes describe some well known invalid java classes:

363679.1
301345.1
339962.1
471901.1