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JAR files are not identical bits

each time I create one jar file with the same contents of the last as the md5 checksum always changes. I believe these are timestamps and creation dates, but I want to have a specific reason. Thanks to everyone.

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This can happen because your build procedure creates several files each time it starts. For example, MANIFEST.MFlocated beneath META-INFmay contain a date, build number, etc. Therefore, if it is important for you to check the manifest and other generated generated files.

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