Determine state of LSIF-java

Created by: efritz

https://github.com/sourcegraph/lsif-java/

• Check the current issues and see what is no longer reproducible with the latest version. Close the issues which are not reproducible. Comment on the ones that are.
• Choose a set of three to six OSS repositories not listed there and ensure generation does not crash the indexer.
• Upload the resulting indexes to a local Sourcegraph instance and get hover tooltips on the code. Catalog which language features are missing results or have incorrect results (e.g. enums, jump to def into inner classes, etc).