Document workaround for `@PersistenceContext` and `@PersistenceUnit` in test classes in AOT

[sbrannen]

Overview

While running JPA tests in the spring-test module in AOT mode, I noticed that we do not support dependency injection in an instance of a test class via @PersistenceContext and @PersistenceUnit.

For example, the following field in AbstractEjbTxDaoTestNGTests is not injected when running in AOT mode.

@PersistenceContext
protected EntityManager em;

Related Issues

• AOT contribution for @PersistenceContext and @PersistenceUnit #28364
• Support the use of @Resource in test classes in AOT mode #31733
• Qualified EntityManager/EntityManagerFactory injection (aligned with Jakarta Persistence 3.2) #33414

[sbrannen]

Update

As of Spring Framework 7.0 M7, it is possible to use @Autowired instead of @PersistenceContext or @PersistenceUnit to inject an EntityManager or EntityManagerFactory into an instance of a test class, respectively, and that works when the tests are run in AOT mode.

In light of that, I am repurposing this issue to document the above in the reference manual.

Related Issues

• Qualified EntityManager/EntityManagerFactory injection (aligned with Jakarta Persistence 3.2) #33414