if (possibleJar.isFile() && possibleJar.getName().endsWith(".jar")) {
                try (final JarFile jarFile = new JarFile(possibleJar.getCanonicalPath())) {
                    final Manifest manifest = jarFile.getManifest();
                    if (manifest != null && manifest.getEntries() != null) {
                        final Attributes attributes = manifest.getMainAttributes();
                        if (attributes != null

    <glob pattern="*.json"/>
  </mime-type>

  <mime-type type="application/manifest+json">
    <_comment>Web Application Manifest file</_comment>
    <sub-class-of type="application/json"/>
    <glob pattern="*.webmanifest"/>
  </mime-type>

  <mime-type type="application/java-vm">
    <_comment>Java Class File</_comment>
    <alias type="application/x-java-vm"/>
    <alias type="application/x-java"/>
    <magic priority="40">