刚学用annotation写hibernate，出问题啦。。。

我已经在数据库中建好了一个TBUSER表，这表里就一个主键字段。。没别的了，就是为了测试然后用annotation写了一个User类
@Entity
@Table(name = "TBUSER")
@GenericGenerator(name = "user_increment", strategy = "increment")
public class User {
private int id; @Id
@Column(name = "UID")
@GeneratedValue(generator = "user_increment")
public int getId() {
return id;
} public void setId(int id) {
this.id = id;
}}
然后写了个测试的main方法，想往表里放一条记录：
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session = HibernateSessionFactory.getSession();
session.beginTransaction();
User u = new User();
session.save(u);
session.getTransaction().commit();
session.close();
}
但是提示错误：
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Hibernate: 
    select
        max(UID) 
    from
        TBUSER
Hibernate: 
    insert 
    into
        TBUSER
        (UID) 
    values
        (?)
Exception in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:90)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:266)
at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:167)
at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1028)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:366)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
at com.hib.entity.Test.main(Test.java:18)
Caused by: java.sql.BatchUpdateException: ORA-00928: 缺失 SELECT 关键字 at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10070)
at oracle.jdbc.driver.OracleStatementWrapper.executeBatch(OracleStatementWrapper.java:213)
at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)
at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)
... 8 more求解啊大侠们