Hibernate "The resource type Session does not implement java.lang.AutoCloseable"

Question

I want to use construction

import org.hibernate.Session;
...
try (Session session){

}

How can I do that? Because "The resource type Session does not implement java.lang.AutoCloseable"

I know, that I need to extend Session and override AutoCloseable method, but when I've try to do that, there is error "The type Session cannot be the superclass of SessionDAO; a superclass must be a class"

Update

I've wrote my own DAO framework, but will be use Spring for that

Maybe this could help you: http://stackoverflow.com/questions/2016299/does-java-have-a-using-statement — Semih Eker, Dec 10 '14 at 09:27
http://stackoverflow.com/questions/24041170/how-to-make-use-of-try-catch-and-resource-statement-for-closing-the-connection — pomkine, Dec 10 '14 at 09:50

Vlad Mihalcea · Answer 1 · 2018-01-05T17:33:35.190

First, you should use a much more solid session/transaction handling infrastructure, like Spring offers you. This way you can use the Same Session across multiple DAO calls and the transaction boundary is explicitly set by the @Transactional annotation.

If this is for a test project of yours, you can use a simple utility like this one:

protected <T> T doInTransaction(TransactionCallable<T> callable) {
    T result = null;
    Session session = null;
    Transaction txn = null;
    try {
        session = sf.openSession();
        txn = session.beginTransaction();

        result = callable.execute(session);
        txn.commit();
    } catch (RuntimeException e) {
        if ( txn != null && txn.isActive() ) txn.rollback();
        throw e;
    } finally {
        if (session != null) {
            session.close();
        }
    }
    return result;
}

And you can call it like this:

final Long parentId = doInTransaction(new TransactionCallable<Long>() {
        @Override
        public Long execute(Session session) {
            Parent parent = new Parent();
            Child son = new Child("Bob");
            Child daughter = new Child("Alice");
            parent.addChild(son);
            parent.addChild(daughter);
            session.persist(parent);
            session.flush();
            return parent.getId();
        }
});

Check this GitHub repository for more examples like this one.

Hibernate "The resource type Session does not implement java.lang.AutoCloseable"

1 Answers1