scwhittle opened a new pull request #11096: [BEAM-9399] Change the redirection of System.err to be a custom PrintStream URL: https://github.com/apache/beam/pull/11096 This replaces the current implementation of a custom output stream wrapped by standard PrintStream, removing a possible deadlock between the PrintStream and handler. The deadlock can occur if something beneath the handler lock attempts to use System.err, reversing the normal locking order. By using PrintStream we can use a StringBuffer instead of a ByteBuffer, which also avoids extra encoding and decoding between byte arrays and Strings. ------------------------ Thank you for your contribution! 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