hibernate的saveorupdate失灵

hibernate的saveorupdate失效
saveorupdate（）调用时候 如果ID为空会实现save方法来保存
但是当我的ID不为空时候  为什么就是不调用更新语句来更新 郁闷了很久 找不到原因
帮忙分析下

我的pojo一些代码

		// Property accessors
		@Id
		@GeneratedValue(generator = "paymentableGenerator")    
		@GenericGenerator(name = "paymentableGenerator", strategy = "identity") 
		public Integer getId() {
			return this.id;
		}
	
		public void setId(Integer id) {
			this.id = id;
		}
		
		@OneToMany(mappedBy="user",fetch=FetchType.EAGER)
		public Set<UserPermission> getUserPermissions() {
			return userPermissions;
		}
	
		public void setUserPermissions(Set<UserPermission> userPermissions) {
			this.userPermissions = userPermissions;
		}
	
		@OneToMany(mappedBy="user",fetch=FetchType.EAGER)
		public Set<UserRole> getUserRoles() {
			return this.userRoles;
		}
	
		public void setUserRoles(Set<UserRole> userRoles) {
			this.userRoles = userRoles;
		}

 我的web.xml 和事物的一些配置

<filter>
		<filter-name>hibernateFilter</filter-name>
		<filter-class>
			org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
		</filter-class> 
		<init-param>  
           <param-name>flushMode</param-name>  
           <param-value>AUTO</param-value>  
       </init-param> 
       <init-param>  
           <param-name>singleSession</param-name>  
           <param-value>true</param-value>  
       </init-param>  
   </filter>  
   
	 <filter-mapping>
		<filter-name>hibernateFilter</filter-name>
		<url-pattern>*.action</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>hibernateFilter</filter-name>
		<url-pattern>/j_acegi_security_check</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>hibernateFilter</filter-name>
		<url-pattern>*.jsp</url-pattern>
	</filter-mapping> 	


<!--applicationContext的配置-->


 <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">    
	<property name="sessionFactory">
	<ref local="sessionFactory"/>
	</property>    
   </bean> 
 
 <bean id="baseTransaction" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" 
           abstract="true"> 
           
         <property name="transactionManager" ref="transactionManager"/> 
         <property name="proxyTargetClass" value="true"/>