I figured maybe jswat would help. And, I got as far as loading the database, but couldn't actually trigger the problem before jswat died:
java.lang.StringIndexOutOfBoundsException
at java.lang.StringBuffer.deleteCharAt(StringBuffer.java:650)
at com.bluemarsh.jswat.PathManager.setSourcePath(PathManager.java:478)

(and so on)

I hate Java.