Spring data报错：Inferred type ‘S’ for type parameter ‘S’ is not within its bound;

参照 org.springframework.data.repository.query.QueryByExampleExecutor 源码：

findOne:

/*** Returns a single entity matching the given {@link Example} or {@literal null} if none was found.** @param example must not be {@literal null}.* @return a single entity matching the given {@link Example} or {@link Optional#empty()} if none was found.* @throws org.springframework.dao.IncorrectResultSizeDataAccessException if the Example yields more than one result.*/
<S extends T> Optional<S> findOne(Example<S> example);

参照 org.springframework.data.repository.CrudRepository 源码：
findById:

/*** Retrieves an entity by its id.* * @param id must not be {@literal null}.* @return the entity with the given id or {@literal Optional#empty()} if none found* @throws IllegalArgumentException if {@code id} is {@literal null}.*/
Optional<T> findById(ID id);

findOne(id) 用 findById(id).orElse(null) 替换即可。

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Spring data报错：Inferred type 'S' for type parameter 'S' is not within its bound;

Spring data报错：Inferred type ‘S’ for type parameter ‘S’ is not within its bound;

Spring data报错：Inferred type 'S' for type parameter 'S' is not within its bound;相关推荐

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