Here are the problems reported by findbugs:
(medium priority)
com.sun.crypto.provider.FeedbackCipher: UwF
com.sun.crypto.provider.PBECipherCore: UuF
com.sun.crypto.provider.PrivateKeyInfo: UrF
com.sun.crypto.provider.RSACipher: ES
javax.crypto.Cipher: DC
javax.crypto.KeyAgreement: DC
javax.crypto.Mac: DC

where
UwF = Unwritten field
UuF = Unused field
UrF = Unread field
ES = Comparison of String objects using == or !=
DC = Possible doublecheck

These errors should be further investigated and fixed if deemed problematic.