求助：hibernate联合主键 （注解），测试时一直报null

@Entity
@Table(name="SysRoleResource")
@IdClass(value=RoleResourcePK.class)
@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler"})
public class RoleResource implements Serializable{
private static final long serialVersionUID = 6109494575468275047L;
private Integer RoleId;
private Integer ResourceId;
@Id
@Column(length=10,name="RoleId")
public Integer getRoleId() {
return RoleId;
}
public void setRoleId(Integer roleId) {
RoleId = roleId;
}
@Id
@Column(length=10,name="ResourceId")
public Integer getResourceId() {
return ResourceId;
}
public void setResourceId(Integer resourceId) {
ResourceId = resourceId;
}
@Override
public String toString() {
return "RoleResource [RoleId=" + RoleId + ", ResourceId=" + ResourceId
+ "]";
}
}//实体类

//主键类
public class RoleResourcePK implements Serializable{

private static final long serialVersionUID = -3149726451195304787L;
private Integer RoleId;
private Integer ResourceId;
public Integer getRoleId() {
    return RoleId;
}
public void setRoleId(Integer roleId) {
    RoleId = roleId;
}
public Integer getResourceId() {
    return ResourceId;
}
public void setResourceId(Integer resourceId) {
    ResourceId = resourceId;
}
@Override
public String toString() {
    return "RoleResourcePK [RoleId=" + RoleId + ", ResourceId="
            + ResourceId + "]";
}
@Override
public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result
            + ((ResourceId == null) ? 0 : ResourceId.hashCode());
    result = prime * result + ((RoleId == null) ? 0 : RoleId.hashCode());
    return result;
}
@Override
public boolean equals(Object obj) {
    if (this == obj)
        return true;
    if (obj == null)
        return false;
    if (getClass() != obj.getClass())
        return false;
    RoleResourcePK other = (RoleResourcePK) obj;
    if (ResourceId == null) {
        if (other.ResourceId != null)
            return false;
    } else if (!ResourceId.equals(other.ResourceId))
        return false;
    if (RoleId == null) {
        if (other.RoleId != null)
            return false;
    } else if (!RoleId.equals(other.RoleId))
        return false;
    return true;
}

}
//测试
@Test
public void add(){
RoleResource rr=new RoleResource();
rr.setResourceId(2);
rr.setRoleId(1);
try {
rs.save(rr);
System.out.println("添加成功"+JSON.toJSONString(rr));
} catch (Exception e) {
System.out.println("添加失败"+e.getMessage());
}
}
测试时一直报null
org.springframework.orm.hibernate4.HibernateTransactionManager.afterPropertiesSet(360) | Using DataSource [com.mchange.v2.c3p0.ComboPooledDataSource[ identityToken -> 1hgeest9m680zit10ue8ko|72534f6f, dataSourceName -> 1hgeest9m680zit10ue8ko|72534f6f ]] of Hibernate SessionFactory for HibernateTransactionManager
null
添加失败null

这是我的数据源配置及 sessionFactory配置

destroy-method="close">

<!-- 请求超时时间 -->
<property name="checkoutTimeout" value="30000" />
<!-- 每60秒检查所有连接池中的空闲连接。默认值: 0，不检查 -->
<property name="idleConnectionTestPeriod" value="30" />
<!-- 连接数据库连接池最大空闲时间 -->
<property name="maxIdleTime" value="30" />
<!-- 连接池初始化连接数 -->
<property name="initialPoolSize" value="5" />
<property name="minPoolSize" value="5" />
<property name="maxPoolSize" value="20" />
<!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。默认值: 3 -->
<property name="acquireIncrement" value="5" />

class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<!-- 注入数据源 相关信息看源码 -->

<!-- hibernate配置信息 -->


${hibernate.dialect}
${hibernate.show_sql}
${hibernate.format_sql}
${hibernate.hbm2ddl.auto}
true

        <!-- 开启二级缓存 ehcache -->
        <prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</prop>
        <prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</prop>
        <prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</prop>
        <prop key="hibernate.cache.provider_configuration_file_resource_path">${hibernate.cache.provider_configuration_file_resource_path}
        </prop>
    </props>
</property>
<!-- 扫描hibernate注解配置的entity -->
<property name="packagesToScan" value="cn.com.topsoft.entity" />

建表语句

 create table user_relation (
    user_id_a int not null,
    user_id_b int not null,
    relation_status int not null,
    relation_start datetime,
    primary key(user_id_a,user_id_b),
    foreign key (user_id_a) references user_main(user_id),
    foreign key (user_id_b) references user_main(user_id)
)

前两个是联合主键
实体类UserRelation.java

 package com.main.entity;


import java.sql.Timestamp;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.Table;

import com.alibaba.fastjson.annotation.JSONField;

/*
 * http://blog.csdn.net/robinpipi/article/details/7655388
 */

@Entity
@Table(name="user_relation")
@IdClass(value=UserRelationPriKey.class)
public class UserRelation{
    private int userIdA;
    private int userIdB;
    private int relationStatus;
    private Timestamp relationStart;
    @Id
    @Column(name="user_id_a")
    public int getUserIdA() {
        return userIdA;
    }
    public void setUserIdA(int userIdA) {
        this.userIdA = userIdA;
    }
    @Id
    @Column(name="user_id_b")
    public int getUserIdB() {
        return userIdB;
    }
    public void setUserIdB(int userIdB) {
        this.userIdB = userIdB;
    }
    @Column(name="relation_status")
    public int getRelationStatus() {
        return relationStatus;
    }
    public void setRelationStatus(int relationStatus) {
        this.relationStatus = relationStatus;
    }
    @Column(name="relation_start")
    @JSONField (format="yyyy-MM-dd HH:mm:ss")
    public Timestamp getRelationStart() {
        return relationStart;
    }
    public void setRelationStart(Timestamp relationStart) {
        this.relationStart = relationStart;
    }

}

联合主键配置类UserRelationPriKey.java

 package com.main.entity;

import java.io.Serializable;

public class UserRelationPriKey implements Serializable{
    /**
     * UserRelation的联合主键
     */
    private static final long serialVersionUID = 1L;
    private int userIdA;
    private int userIdB;

    public int getUserIdA() {
        return userIdA;
    }
    public void setUserIdA(int userIdA) {
        this.userIdA = userIdA;
    }
    public int getUserIdB() {
        return userIdB;
    }
    public void setUserIdB(int userIdB) {
        this.userIdB = userIdB;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + userIdA;
        result = prime * result + userIdB;
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        UserRelationPriKey other = (UserRelationPriKey) obj;
        if (userIdA != other.userIdA)
            return false;
        if (userIdB != other.userIdB)
            return false;
        return true;
    }
}

spring hibernate datasource配置

 <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:config/jdbc.properties" />
    </bean>

    <!-- 配置数据源 -->
    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${driverClassName}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${userName}"></property>
        <property name="password" value="${password}"></property>
    </bean>

hibernate session配置

 <!-- 配置 hibernate session -->

    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="hibernate.hbm2ddl.auto">update</prop>  
                <prop key="hibernate.show_sql">true</prop>  
                <prop key="hibernate.format_sql">true</prop>

                <prop key="hibernate.cache.use_second_level_cache">false</prop>
                <prop key="hibernate.cache.use_query_cache">false</prop>
                <prop key="current_session_context_class">thread</prop>
                <prop key="hibernate.current_session_context_calss">org.springframework.orm.hibernate4.SpringSessionContext</prop>
            </props>
        </property>
        <property name="packagesToScan">  
            <list>  
                <value>com.main.entity</value>  
            </list>  
        </property>  
    </bean>

这样配置在我的项目中是能够正常增删改查的，我参考的博客是entity里面的那个链接，看了几遍你的代码眼拙看不出什么名堂，慢慢测试总能解决的，祝顺利~

我正好在做项目时也用了hibernate注解的联合主键，配置的方法和你一样的，没有出现错误。和你的对照了一下，你配置的联合主键应该是没有任何问题的（如果中间没有出现写错字母的情况的话）。看你下面报错报的错误是数据源（datasource）的错误，应该不是这里联合主键的错误，你最好再检查一下数据源配置是否正确。
我把我的数据源配置代码放一下（我用的spring+hibernate），希望对你解决问题有些帮助。hibernate单独配置可以百度一下博客都有，慢慢比对一下。

 <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:config/jdbc.properties" />
    </bean>

    <!-- 配置数据源 -->
    <bean id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${driverClassName}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${userName}"></property>
        <property name="password" value="${password}"></property>
    </bean>

其中具体数据是放在了jdbc.properties这个资源文件里面了，如果确认数据源没问题的话最好再看一下sessionFactory配置是否正确。

去这里看看
http://blog.csdn.net/je_ge/article/details/53678164

这是我的数据源配置及 sessionFactory配置

<!-- 配置数据源 c3p0 -->
destroy-method="close">

    <!-- 请求超时时间 -->
    <property name="checkoutTimeout" value="30000" />
    <!-- 每60秒检查所有连接池中的空闲连接。默认值: 0，不检查 -->
    <property name="idleConnectionTestPeriod" value="30" />
    <!-- 连接数据库连接池最大空闲时间 -->
    <property name="maxIdleTime" value="30" />
    <!-- 连接池初始化连接数 -->
    <property name="initialPoolSize" value="5" />
    <property name="minPoolSize" value="5" />
    <property name="maxPoolSize" value="20" />
    <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。默认值: 3 -->
    <property name="acquireIncrement" value="5" />
</bean>

<!-- 配置hibernate的SessionFactory -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <!-- 注入数据源 相关信息看源码 -->
    <property name="dataSource" ref="dataSource" />
    <!-- hibernate配置信息 -->
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
            <prop key="hibernate.enable_lazy_load_no_trans">true</prop>

            <!-- 开启二级缓存 ehcache -->
            <prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</prop>
            <prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</prop>
            <prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</prop>
            <prop key="hibernate.cache.provider_configuration_file_resource_path">${hibernate.cache.provider_configuration_file_resource_path}
            </prop>
        </props>
    </property>
    <!-- 扫描hibernate注解配置的entity -->
    <property name="packagesToScan" value="cn.com.topsoft.entity" />

</bean>