Sun JDK 1.5 annotation compile error-优快云博客

本文链接：https://blog.youkuaiyun.com/anson2003/article/details/84509479

本文解决了一个Sun JDK 1.5中的编译器BUG(JDK-6302954)，该BUG导致类型变量返回约束推断失败。通过调整泛型调用方式，成功解决了编译错误问题。

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Sun JDK 1.5 compiler BUG： JDK-6302954 : Inference fails for type variable return constraint

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6302954

编译报错如下：

type parameters of <T>T cannot be determined; no unique maximal instance exists for type variable T with upper bounds

 @SuppressWarnings("unchecked")
  public static <T> T readField(Field field, Object target, boolean forceAccess)
      throws IllegalAccessException {
    if (field == null) {
      throw new IllegalArgumentException("The field must not be null");
    }
    if (forceAccess && !field.isAccessible()) {
      field.setAccessible(true);
    } else {
      setAccessibleWorkaround(field);
    }
    return (T) field.get(target);
  }

public static <T> T readField(Field field, Object target)
      throws IllegalAccessException {
    return FieldUtils.readField(field, target, false);  //这里编译报错
  }

修正代码：

public static <T> T readField(Field field, Object target)
      throws IllegalAccessException {
    return FieldUtils.<T> readField(field, target, false);
  }

FieldUtils.<T> readField(field, target, false)