#fixed code
                              public ConstantBindingBuilderImpl bindConstant(Annotation annotation) {
    return bind(source(), Key.strategyFor(annotation));
  }
#vulnerable code 
                              public ConstantBindingBuilderImpl bindConstant(Annotation annotation) {
    ensureNotCreated();
    return bind(source(), Key.strategyFor(annotation));
  } 
                            #location 2 
                            #vulnerability type THREAD_SAFETY_VIOLATION