解决illegal access to loading collection

最新推荐文章于 2025-04-03 18:14:10 发布

原创最新推荐文章于 2025-04-03 18:14:10 发布 · 783 阅读

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文章标签：

#Access #Hibernate #Java #junit #Eclipse

本文介绍了解决在Hibernate框架中使用一对多左连接时出现的错误方法。通过在配置文件中设置特定参数，可以有效避免加载集合时引发的异常。

在一对多关系中，使用左连接（在配置文件中用“fetch=join”或者在Hsql中使用 left join fetch）都会报下面的错误

[
org.hibernate.PropertyAccessException: Exception occurred inside setter of com.ccdup.order.entity.OrderInfo.product   
    at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:89)   
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues(AbstractEntityTuplizer.java:360)   
    at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:221)   
    at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3594)   
    at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:152)   
    at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:877)   
    at org.hibernate.loader.Loader.doQuery(Loader.java:752)   
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)   
    at org.hibernate.loader.Loader.doList(Loader.java:2228)   
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)   
    at org.hibernate.loader.Loader.list(Loader.java:2120)   
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:401)   
    at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:361)   
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)   
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1148)   
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)   
    at com.ccdup.order.dao.OrderInfoDao.findAllOrderInfo(OrderInfoDao.java:25)   
    at com.ccdup.test.TestOf.getAall(TestOf.java:25)   
    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:585)   
    at org.junit.internal.runners.TestMethodRunner.executeMethodBody(TestMethodRunner.java:99)   
    at org.junit.internal.runners.TestMethodRunner.runUnprotected(TestMethodRunner.java:81)   
    at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)   
    at org.junit.internal.runners.TestMethodRunner.runMethod(TestMethodRunner.java:75)   
    at org.junit.internal.runners.TestMethodRunner.run(TestMethodRunner.java:45)   
    at org.junit.internal.runners.TestClassMethodsRunner.invokeTestMethod(TestClassMethodsRunner.java:66)   
    at org.junit.internal.runners.TestClassMethodsRunner.run(TestClassMethodsRunner.java:35)   
    at org.junit.internal.runners.TestClassRunner$1.runUnprotected(TestClassRunner.java:42)   
    at org.junit.internal.runners.BeforeAndAfterRunner.runProtected(BeforeAndAfterRunner.java:34)   
    at org.junit.internal.runners.TestClassRunner.run(TestClassRunner.java:52)   
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:45)   
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)   
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)   
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)   
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)   
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)   
Caused by: java.lang.reflect.InvocationTargetException   
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)   
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)   
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)   
    at java.lang.reflect.Method.invoke(Method.java:585)   
    at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:66)   
    ... 37 more   
Caused by: org.hibernate.LazyInitializationException: illegal access to loading collection   
    at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:363)   
    at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:108)   
    at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:186)   
    at com.ccdup.order.entity.OrderInfo.setProduct(OrderInfo.java:173)   
    ... 42 more  

/code]

解决方法：在配置文件一对多处加入access="field"，即
[code="java"]
        <set
            name="customer"
            lazy="false"
            cascade="all"
            sort="unsorted"
            outer-join="true"

            access="field"

            fetch="join"
        >