@DoNotStrip
  private void findMethods() {
    Systrace.beginSection(TRACE_TAG_REACT_JAVA_BRIDGE, "findMethods");
   //  define a methodNames set,But we don't add methods to the collection
    Set<String> methodNames = new HashSet<>();

    Class<? extends NativeModule> classForMethods = mModuleClass;
    Class<? extends NativeModule> superClass =
        (Class<? extends NativeModule>) mModuleClass.getSuperclass();
    if (ReactModuleWithSpec.class.isAssignableFrom(superClass)) {
      // For java module that is based on generated flow-type spec, inspect the
      // spec abstract class instead, which is the super class of the given java
      // module.
      classForMethods = superClass;
    }
    Method[] targetMethods = classForMethods.getDeclaredMethods();

    for (Method targetMethod : targetMethods) {
      ReactMethod annotation = targetMethod.getAnnotation(ReactMethod.class);
      if (annotation != null) {
        String methodName = targetMethod.getName();
        if (methodNames.contains(methodName)) {
          // We do not support method overloading since js sees a function as an object regardless
          // of number of params.
          throw new IllegalArgumentException(
            "Java Module " + getName() + " method name already registered: " + methodName);
        }
        MethodDescriptor md = new MethodDescriptor();
        JavaMethodWrapper method = new JavaMethodWrapper(this, targetMethod, annotation.isBlockingSynchronousMethod());
        md.name = methodName;
        md.type = method.getType();
        if (md.type == BaseJavaModule.METHOD_TYPE_SYNC) {
          md.signature = method.getSignature();
          md.method = targetMethod;
        }
        mMethods.add(method);
        mDescs.add(md);
      }
    }
    Systrace.endSection(TRACE_TAG_REACT_JAVA_BRIDGE);
  }