#vulnerable code 
                              public ObjectGraph plus(Object... modules) {
    linker.linkAll();
    return makeGraph(this, plugin, modules);
  } 
                            #location 2 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                              public ObjectGraph plus(Object... modules) {
    linkEverything();
    return makeGraph(this, plugin, modules);
  }