How to Fix the 'Invalid Signature File Digest for Manifest main attributes' Error in JAR Files?

Troubleshooting "Invalid Signature File" Error When Running JAR Files

When attempting to execute a Java Archive (JAR) file, certain circumstances can lead to the perplexing error: "Invalid signature file digest for Manifest main attributes." This issue may arise when your program utilizes an external library and is packaged as a JAR.

One potential cause of this error lies in the presence of manifest signature files within the JAR. These files are typical byproducts of the signing process, which is a security measure for JAR files. When attempting to create a shaded "uber-JAR" with the maven-shade-plugin, an exclusion configuration is crucial to prevent this conflict.

To resolve the issue, modify the plugin configuration by adding the following filter section:

<configuration>
    <filters>
        <filter>
            <artifact>*:*</artifact>
            <excludes>
                <exclude>META-INF/*.SF</exclude>
                <exclude>META-INF/*.DSA</exclude>
                <exclude>META-INF/*.RSA</exclude>
            </excludes>
        </filter>
    </filters>
    <!-- Additional configuration. -->
</configuration>

This configuration excludes manifest signature files (SF, DSA, RSA) from the uber-JAR, thus eliminating the source of the error. With this modification, your program should run successfully without encountering the "Invalid signature file" exception.

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