Are Spliterators from Iterable results from Spring JPA safe to use in parallelStream

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Similar to Are parallelStreams on OneToMany collections safe? but my question is specific to the result from a Spring JPA Repository query e.g.

public interface Students extends JpaRepository<Student, UUID> {
    @EntityGraph("Student.withProgramAndSchedule")
    @Query("from Student s")
    Iterable<Student> findAllWithProgramAndSchedule();
}

Can I safely use it with parallel? e.g.

StreamSupport.stream(students.findAllWithProgramAndSchedule().spliterator(), true)
java-stream thread-safety jpa spring java
1 Answers

JPA entity managers and the entities they manage are not thread safe.

One way to think about it is that students.findAllWithProgramAndSchedule() might trigger a lazy load. Under the hood this will use a JDBC connection which itself is not thread safe, therefore the students.findAllWithProgramAndSchedule() can't be thread safe.

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