Play Framework：为Spring RabbitMQ监听器手动打开JPA上下文

Question

I am using Spring-AMQP to monitor a RabbitMQ message queue in a Play application.

The problem is I can not access my database from the listener code since the JPA context is not open in this scope.

I understand Play Framework manages the JPA context so that it is open when processing HTTP requests, but is there a way I can use JPA from outside Play controllers/jobs?

Answer 1

Just found the answer was to use JPAPlugin!

Example listener method:

public void process(Message message) {
    JPAPlugin.startTx(false);
    boolean rollBack = false;
    try {
        // work with your models
        JPA.em().flush();
    } catch (RuntimeException e) {
        rollBack = true;
        // throw exception to prevent msg ACK, need to refine error handling :)
        throw e;
    } finally {
        JPAPlugin.closeTx(rollBack);
    }
}