reintroduce ByteBuffer string result validation deleted in r48889, the catching tests were passing for wrong reasons
reintroduce ByteBuffer string result validation deleted in r48889, the catching tests were passing for wrong reasons

git-svn-id: 6e74a02f85675cec270f5d931b0f6998666294a3@49001 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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