src/main/java/org/codehaus/plexus/archiver/jar/JarArchiver.java
public void reset()
    {
        super.reset();
        configuredManifest = null;
        filesetManifestConfig = null;
        mergeManifestsMain = false;
        manifestFile = null;
        index = false;
    }
public void reset()
    {
        super.reset();
        configuredManifest = null;
        filesetManifestConfig = null;
        mergeManifestsMain = false;
        manifestFile = null;
        index = false;
    }
reset to default values.

@see ZipArchiver#reset