jsf+；jpa&x2B；日食朱诺

当我测试我的类main向表中添加数据时，我使用了jpa（eclipselink），我得到了这个错误

[EL Info]: 2014-07-18 22:41:55.274--ServerSession(22745079)--EclipseLink, version: Eclipse Persistence Services - 2.4.2.v20130514-5956486 [EL Info]: connection: 2014-07-18 22:41:55.637--ServerSession(22745079)--    
file:/C:/Users/toshiba/workspaceV2/login/build/classes/_login login successful
Exception in thread "main" java.lang.IllegalStateException:  Exception Description: No transaction is currently active
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:77)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:63)
at dao.Comptesdao.ajouterComptedao(Comptesdao.java:17)
at test.Main.main(Main.java:15)

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你有什么想法吗

没有任何代码就很难判断。你看过其中一些问题了吗？这段代码是公共类Comptesdao{public static EntityManager factory emf=Persistence.createEntityManager（“login”）；public static EntityManager em=emf.createEntityManager（）；public static EntityTransaction tx=em.getTransaction（）；public void ajutercomptedao（Compte）{if（tx.isActive（））tx.begin（）；em.persistent（）（compte）；tx.commit（）；}