Java SecurityException: signer information does not match

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This happens when classes belonging to the same package are loaded from different JAR files, and those JAR files have signatures signed with different certificates – or, perhaps more often, at least one is signed and one or more others are not (which includes classes loaded from directories since those AFAIK cannot be signed).

So either make sure all JARs (or at least those which contain classes from the same packages) are signed using the same certificate, or remove the signatures from the manifest of JAR files with overlapping packages.

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