FYI....I just added a utility for finding broken links in the generated Javadocs. I found hundreds of them.
It's just a simple class called JavadocLinkTester. Just run it without args after running mvn javadoc:aggregate and it will find any broken links..
I recommend using it if you make any extensive updates to the Javadocs.
I looked for existing tools online but came up empty. I also tried using the W3C link checker utility, but it was REALLY slow since it actually crawled all the links.
It would be nice to include this as part of the Maven build but I'm not familiar with creating Maven components.
Source can be found here:
https://github.com/apache/juneau/blob/master/juneau-core/juneau-core-test/src/test/java/org/apache/juneau/utils/JavadocLinkTester.java