Entitymanager的问题，急！！！！
大致代码如下：
EntityManagerFactory emf = Persistence.createEntityManagerFactory( ".... ");

EntityManager em = emf.createEntityManager();

em.getTransaction().begin();
em.persist(user);//user是一个实体bean
em.getTransaction().commit();

运行后，后台服务器提示：
15:19:55,406 ERROR [JDBCTransaction] JDBC commit failed
java.sql.SQLException: You cannot commit during a managed transaction!
at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.jdbcCommit(BaseWrapperManage dConnection.java:543)
.....

[解决办法]
帮你顶
[解决办法]
你把事务设置成自动的试试