小编Bhu*_*han的帖子

我有我的简单Android应用程序,它使用REST Web服务.现在我想使用GCM从我的REST Web服务向Android应用程序发送通知.

这是怎么回事？这个要求有没有简单的教程？我搜索并找到了Google API,但我不明白.

当我尝试本教程时，我是 JPA 和休眠的新手 。我在我的persistence.xml中添加了以下提供者，

<provider>org.hibernate.ejb.HibernatePersistence</provider> 

我收到这个错误..

log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.NoSuchMethodError: org.hibernate.cfg.Configuration.addAnnotatedClass(Ljava/lang/Class;)Lorg/hibernate/cfg/Configuration;
    at org.hibernate.ejb.Ejb3Configuration.addAnnotatedClass(Ejb3Configuration.java:1421)
    at org.hibernate.ejb.Ejb3Configuration.addNamedAnnotatedClasses(Ejb3Configuration.java:1391)
    at org.hibernate.ejb.Ejb3Configuration.addClassesToSessionFactory(Ejb3Configuration.java:1184)
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1048)
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:291)
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:373)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
    at de.vogella.jpa.simple.main.Main.main(Main.java:17)

请帮助解决此错误。谢谢