jpa报错：Removing a detached instance

报错代码为：

Person person = new Person();
person.setId( 1L );
person.setName("John Doe");entityManager.remove( person);entityManager.flush();

应该是session的问题，替换remove那一行为如下即可：

entityManager.remove( entityManager.find(Person.class,1L) );

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