#vulnerable code 
                              public Map<String, String> getFilenameProvideMap() {
    return ImmutableMap.copyOf(filenameProvideMap);
  } 
                            #location 1 
                            #vulnerability type CHECKERS_IMMUTABLE_CAST
#fixed code
                              public Map<String, String> getFilenameProvideMap() {
    return filenameProvideMap;
  }