What is Jarsigner ?

You can read more about this tool in the offical guide: jarsigner - JAR Signing and Verification Tool.

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Is it possible to sign a single archive file ?

Signing or verifying a Java archive which is neither a project artifact nor an attached artifact can be done by using the archive parameter of the sign and verify goals. If this parameter is set, the goals will process the specified archive and will not process any project artifacts.

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