Java SecurityException: Why a Class Signer Information Mismatch When Recompiling?

Java SecurityException: Why Does Class Signer Information Mismatch?

When recompiling Java classes, you may encounter a "SecurityException" with the following message: "class "Chinese_English_Dictionary"'s signer information does not match signer information of other classes in the same package." This error arises due to discrepancies in class signing within a package.

Cause of the Error:

The error occurs when classes belonging to the same package are loaded from multiple JAR files that have different digital signatures attached to their manifests. Alternatively, some JAR files may lack signatures, while others contain signed classes.

Resolution:

To resolve this issue, you can consider the following options:

• Ensure Consistent Signing: Verify that all JAR files containing classes from the same package have identical digital signatures. This means using the same certificate to sign all relevant JAR files.
• Remove Signatures: If multiple certificates are not feasible, you can remove signatures from the manifests of JAR files with overlapping packages. Doing so will prevent the security checks from failing.

Additional Note:

Classes loaded from directories are typically not signed, so they are treated differently from signed classes loaded from JAR files. This can also contribute to the mismatch error if both types of classes are present within the same package.

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