The javadoc warnings are unrelated. Not sure why findbugs failed, as it ran just fine for me locally (and on the first patch version). Output from my local run:
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 1 new or modified test files.
-1 javadoc. The javadoc tool appears to have generated 2 warning messages.
+1 javac. The applied patch does not increase the total number of javac compiler warnings.
+1 eclipse:eclipse. The patch built with eclipse:eclipse.
+1 findbugs. The patch does not introduce any new Findbugs (version ) warnings.
+1 release audit. The applied patch does not increase the total number of release audit warnings.