Batch file to switch between java version

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  [08001] Connection to localhost:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections. java.net.ConnectException: Connection refused: connect.

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  The shrinker may have failed to optimize the Java bytecode. To disable the shrinker, pass the `--no-shrink` flag to this command.

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  Java coding standards for constants

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