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https://jira.codehaus.org/browse/MJARSIGNER-21?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=281422#comment-281422
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Christian Schulte commented on MJARSIGNER-21:
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Signing with JDK 7 and verifying with JDK 5 and 6 works for me. Can you try
unsigning the archives prior to signing (removeExistingSignatures parameter) ?
What exactly is invalid about the signatures ?
> jars signed using Java 7 have "invalid SHA1 signature"
> ------------------------------------------------------
>
> Key: MJARSIGNER-21
> URL: https://jira.codehaus.org/browse/MJARSIGNER-21
> Project: Maven 2.x Jar Signer Plugin
> Issue Type: Bug
> Affects Versions: 1.2
> Environment: Java 7, Maven 2.2.1
> Reporter: Mike Calmus
> Priority: Critical
>
> Using the plugin with Java 6 works fine. When I use it with Java 7, my applet
> won't load because the SHA1 signatures are invalid.
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