Hibernate的异常PropertyAccessException这是怎么回事?
数据库表:T_users ,T_groups ,T_modules
对应的XML:Tuser.hbm.xml,Tgroup.hbm.xml,Tmodule.hbm.xml
关系:user<—>group 是一对一的关系,group<—>module是一对多的关系
即,一个用户从属于一个群组,一个群组下包含多个功能模块
Tuser.hbm.xml的部分配置:
<!-- Associations -->
<one-to-one
name="group"
class="com.wzr.spring.bean.Group"
cascade="none"
outer-join="auto"
constrained="false"
/>
Tgroup.hbm.xml的部分配置:
<!-- Associations -->
<set
name="modules"
table="t_modules"
lazy="false"
inverse="true"
cascade="all"
sort="unshorted"
order-by="module_order asc"
>
<key
column="group_id"
/>
<one-to-many
class="com.wzr.spring.bean.Module"/>
</set>
Tmodule.hbm.xml的部分配置:
<!-- Associations -->
<many-to-one
name="group"
class="com.wzr.spring.bean.Group"
cascade="none"
outer-join="auto"
update="true"
insert="true"
access="property"
column="group_id"
not-null="true"
/>
使用Middlegen生成POJO,后在Junit中的测试代码如下:
public void testInsert()throws Exception{
Transaction tx=null;
String hql="from Group where group_id='G000000001'";
try{
tx = session.beginTransaction();
List groupList=session.find(hql);
Group group=(Group)groupList.get(0);
Module module=new Module();
module.setModuleId("M000000001");
module.setModuleName("测试模块1");
module.setModuleOrder(1);
module.setMemo("备注");
module.setGroup(group);//将模块关联群组(group_id)
group.getModules().add(module);//群组1添加模块1
session.save(group);
tx.commit();
}
catch(Exception he){
if (tx!=null) tx.rollback();
he.printStackTrace();
Assert.fail(he.getMessage());
}
finally{
session.close();
}
}
运行后出现如下错误信息:
net.sf.hibernate.PropertyAccessException: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of com.wzr.spring.bean.Group.setModules
at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyvalues(AbstractEntityPersister.java:213)
at net.sf.hibernate.impl.SessionImpl.initializeEntity(SessionImpl.java:2174)
at net.sf.hibernate.loader.Loader.doQuery(Loader.java:240)
at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133)
at net.sf.hibernate.loader.Loader.doList(Loader.java:950)
at net.sf.hibernate.loader.Loader.list(Loader.java:941)
at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:834)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1512)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1491)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1483)
at com.wzr.spring.test.HibernateTest.testInsert(HibernateTest.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:397)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:281)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:173)
Caused by: net.sf.cglib.beans.BulkBeanException
at com.wzr.spring.bean.Group$$BulkBeanByCGLIB$$27b99fa1.setPropertyvalues(<generated>)
at net.sf.hibernate.persister.AbstractEntityPersister.setPropertyvalues(AbstractEntityPersister.java:208)
... 25 more
Caused by: java.lang.ClassCastException
... 27 more
错误提示应该是由类型转换引起的,不知是哪个属性配置有问题?
错误信息中的:at com.wzr.spring.test.HibernateTest.testInsert(HibernateTest.java:84)
是在List groupList=session.find(hql);这句?
另,在数据库(如SQLSERVER2000)中建立表关系图,通过Middlegen就可以直接配置好它们的关联关系
,而不用手动去配置one-to-one 或one-to-many,但不知道是否可靠?