Hibernate 3.x "org.hibernate.LazyInitializationException: illegal access to loading collection"异常解决方法

最近在使用Hibernate 3.x做一个小项目，但是在持久化一些类的时候抛出以下异常

Sep 2, 2010 12:56:40 PM org.hibernate.LazyInitializationException <init>
SEVERE: illegal access to loading collection
org.hibernate.LazyInitializationException: illegal access to loading collection
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
	at org.hibernate.collection.PersistentSet.hashCode(PersistentSet.java:434)
	at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:881)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:174)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:348)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:387)
	at com.platform.gui.framework.model.BaseBean.hashCode(BaseBean.java:26)
	at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:881)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:174)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:348)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:387)
	at com.platform.gui.framework.model.BaseBean.hashCode(BaseBean.java:26)
	at java.util.HashMap.put(HashMap.java:418)
	at java.util.HashSet.add(HashSet.java:194)
	at java.util.AbstractCollection.addAll(AbstractCollection.java:318)
	at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:352)
	at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:260)
	at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:245)
	at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:218)
	at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:921)
	at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:909)
	at org.hibernate.loader.Loader.doQuery(Loader.java:773)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
	at org.hibernate.loader.Loader.loadCollection(Loader.java:2082)
	at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:62)
	at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:628)
	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
	at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1853)
	at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:479)
	at org.hibernate.engine.StatefulPersistenceContext.initializeNonLazyCollections(StatefulPersistenceContext.java:899)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:275)
	at org.hibernate.loader.Loader.doList(Loader.java:2449)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2192)
	at org.hibernate.loader.Loader.list(Loader.java:2187)
	at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1706)
	at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
	at TestDB.testRes(TestDB.java:103)
	at TestDB.main(TestDB.java:22)
Exception in thread "main" org.hibernate.LazyInitializationException: illegal access to loading collection
	at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:366)
	at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
	at org.hibernate.collection.PersistentSet.hashCode(PersistentSet.java:434)
	at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:881)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:174)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:348)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:387)
	at com.platform.gui.framework.model.BaseBean.hashCode(BaseBean.java:26)
	at org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:881)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionAppend(HashCodeBuilder.java:174)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:348)
	at org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:387)
	at com.platform.gui.framework.model.BaseBean.hashCode(BaseBean.java:26)
	at java.util.HashMap.put(HashMap.java:418)
	at java.util.HashSet.add(HashSet.java:194)
	at java.util.AbstractCollection.addAll(AbstractCollection.java:318)
	at org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:352)
	at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:260)
	at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:245)
	at org.hibernate.engine.loading.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:218)
	at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:921)
	at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:909)
	at org.hibernate.loader.Loader.doQuery(Loader.java:773)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:270)
	at org.hibernate.loader.Loader.loadCollection(Loader.java:2082)
	at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:62)
	at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:628)
	at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:83)
	at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1853)
	at org.hibernate.collection.AbstractPersistentCollection.forceInitialization(AbstractPersistentCollection.java:479)
	at org.hibernate.engine.StatefulPersistenceContext.initializeNonLazyCollections(StatefulPersistenceContext.java:899)
	at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:275)
	at org.hibernate.loader.Loader.doList(Loader.java:2449)
	at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2192)
	at org.hibernate.loader.Loader.list(Loader.java:2187)
	at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1706)
	at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
	at TestDB.testRes(TestDB.java:103)
	at TestDB.main(TestDB.java:22)

后来发现是自己的domain类继承了一个BaseBean，而那个BaseBean使用了apache commons-lang包里的一些类，比如：ToStringBuilder， EqualsBuilder和HashCodeBuilder，代码大致如下：

import java.io.Serializable;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
public abstract class BaseBean implements Serializable {
	private static final long serialVersionUID = 1L;
	@Override
	public String toString() {
		return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
	}
	
	@Override
	public boolean equals(Object obj) {
		return EqualsBuilder.reflectionEquals(this, obj);
	}
	
	@Override
	public int hashCode() {
		return HashCodeBuilder.reflectionHashCode(this);
	}
}

而以上异常就是由于其中的

@Override
	public int hashCode() {
		return HashCodeBuilder.reflectionHashCode(this);
	}

引起的，解决办法就是不要继承父类的hashCode方法，或者自己写个hashCode方法。