hibernate mapping error

Question

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
    <class name="EchoMessage" table="echo_message">
        <id name="id">
            <column name="id" />
            <generator class="native"></generator>
        </id>
        <property name="msg" type="java.lang.String">
            <column name="msg" />
        </property>
    </class>
</hibernate-mapping>

Answer 1

SPRING 配置：<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation">
<value>file:src/hibernate.cfg.xml</value>
</property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager" abstract="false" singleton="true" lazy-init="default" autowire="default" dependency-check="default">
<property name="sessionFactory">
<ref local="sessionFactory"></ref>
</property>
</bean>
<bean id="messageDAOProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" abstract="false" singleton="true" lazy-init="default" autowire="default" dependency-check="default">
<property name="transactionManager">
<ref bean="transactionManager" />
</property>
<property name="target">
<ref local="messageDAO" />
</property>
<property name="transactionAttributes">
<props>
<prop key="insert*">PROPAGATION_REQUIRED</prop>
<prop key="get*">PROPAGATION_REQUIRED,readOnly</prop>
<prop key="is*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>
</bean>
<bean id="messageDAO" class="MessageDAOHibernate" abstract="false" singleton="true" lazy-init="default" autowire="default" dependency-check="default">
<property name="sessionFactory">
<ref local="sessionFactory" />
</property>
</bean>
<bean name="test" class="HibernateTest" singleton="false">
  <property name="messageDAO">
   <ref bean="messageDAOProxy" />
  </property>
 </bean>

</beans>

Answer 2

DAO：import java.util.List;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;public class MessageDAOHibernate extends HibernateDaoSupport implements
IMessageDAO { public List getMessages() {
return getHibernateTemplate().find("from echo_message"); 
} public EchoMessage getMessage(Integer id) {
return (EchoMessage) getHibernateTemplate().get(EchoMessage.class,id); } public void saveMessage(EchoMessage msg) {
getHibernateTemplate().saveOrUpdate(msg);
} public void removeMessage(Integer id) {
Object msg=getHibernateTemplate().load(EchoMessage.class,id);
getHibernateTemplate().delete(msg);
}}
事实上，如果我程序调用public EchoMessage getMessage(Integer id)这个函数是正常的，如果调用public List getMessages() 就抛出了以上异常

Answer 3

“from echo_message” 写错了,Hql的语法是"from ${classname}"echo_message --->EchoMessage用getHibernateTemplate().loadAll(EchoMessage.class)不好吗？，还有利用一级缓存的可能。

Answer 4

谢谢Saro(三生) ，问题解决