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• which version of the software
• what platform and JDK
• any particular container being used - if so what version
• stack traces generally really help! If in doubt include the whole thing; often exceptions get wrapped in other exceptions and the exception right near the bottom explains the actual error, not the first few lines at the top. Its very easy for us to skim-read past unnecessary parts of a stack trace.
• log output can be useful too; sometimes enabling DEBUG logging can help
• your code & configuration files are often useful

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