output: #fixed code
                                  @Override
      public String idFromValue(Object value)
      {
          return idFromClass(value.getClass());
      }
input: #vulnerable code 
                                  @Override
      public String idFromValue(Object value)
      {
          Class<?> cls = _typeFactory.constructType(value.getClass()).getRawClass();
          final String key = cls.getName();
          String name;
          synchronized (_typeToId) {
              name = _typeToId.get(key);
              if (name == null) {
                  // 24-Feb-2011, tatu: As per [JACKSON-498], may need to dynamically look up name
                  // can either throw an exception, or use default name...
                  if (_config.isAnnotationProcessingEnabled()) {
                      BeanDescription beanDesc = _config.introspectClassAnnotations(cls);
                      name = _config.getAnnotationIntrospector().findTypeName(beanDesc.getClassInfo());
                  }
                  if (name == null) {
                      // And if still not found, let's choose default?
                      name = _defaultTypeId(cls);
                  }
                  _typeToId.put(key, name);
              }
          }
          return name;
      } 
                              #location 4 
                              #vulnerability type THREAD_SAFETY_VIOLATION