Spring MVC：事务刷新失败

Question

I'm try to execute a SELECT query on an entity in the Google App Engine, but I get this error:

Error Exception: org.springframework.orm.jpa.JpaSystemException: Transaction failed to flush; nested exception is javax.persistence.PersistenceException: Transaction failed to flush

What does this mean?

final Query query = this.entityManager.createQuery("SELECT p FROM SomeEntity p");
list = query.getResultList();

Answer 1

The full stack trace should tell you more where to look. It sounds like it could be a database server-side error. Maybe you've run out of space for transaction logs?