[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3689) NPE when using composite-map-key and composite-element together in a map

[Jason Maskell (JIRA)]

NPE when using composite-map-key and composite-element together in a map
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                 Key: HHH-3689
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3689
             Project: Hibernate Core
          Issue Type: Bug
          Components: core
    Affects Versions: 3.3.1
         Environment: 3.3.1, MySQL 5
            Reporter: Jason Maskell


When trying to get a composite map key working with my composite element class, I ran into this issue. I've seen it reported in a couple of other places since August 08, so it's been around for a while.

		<map name="inventory" table="capo_inventory">
 			<key column="capo_id"/>
			<composite-map-key class="ItemCountKey">
				<key-many-to-one name="item" column="item_id" class="Item"/>
				<key-property name="quality" type="int" column="quality" />
			</composite-map-key>
			<composite-element class="ItemCount">
				<many-to-one name="item" class="com.tamedtornado.data.Item"
					formula="item_id" />
				<property name="quality" formula="quality" type="int" />
				<property name="count" type="int" />
			</composite-element>
 		</map>

This mapping causes this error (root cause):

Caused by: java.lang.NullPointerException
	at org.hibernate.util.StringHelper.qualify(StringHelper.java:287)
	at org.hibernate.util.StringHelper.qualify(StringHelper.java:301)
	at org.hibernate.loader.JoinWalker.walkCompositeElementTree(JoinWalker.java:522)
	at org.hibernate.loader.JoinWalker.walkCollectionTree(JoinWalker.java:333)
	at org.hibernate.loader.JoinWalker.walkCollectionTree(JoinWalker.java:278)
	at org.hibernate.loader.collection.BasicCollectionJoinWalker.<init>(BasicCollectionJoinWalker.java:70)
	at org.hibernate.loader.collection.BasicCollectionLoader.<init>(BasicCollectionLoader.java:76)
	at org.hibernate.loader.collection.BasicCollectionLoader.<init>(BasicCollectionLoader.java:63)
	at org.hibernate.loader.collection.BasicCollectionLoader.<init>(BasicCollectionLoader.java:54)
	at org.hibernate.loader.collection.BatchingCollectionInitializer.createBatchingCollectionInitializer(BatchingCollectionInitializer.java:115)
	at org.hibernate.persister.collection.BasicCollectionPersister.createCollectionInitializer(BasicCollectionPersister.java:320)
	at org.hibernate.persister.collection.AbstractCollectionPersister.postInstantiate(AbstractCollectionPersister.java:563)
	at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:326)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)
	at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:814)
	at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:732)
	at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1369)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1335)
	... 65 more

It's quite easy to debug, but I have no idea what it's supposed to be doing, so have no idea how to fix it. The String[] cols parameter passed into walkCompositeElementTree has two nulls in it, which causes the NPE later in the stack. I hope this is easily reproducible, as I'm going to have to write some really grodey code now that I can't easily find my object by those two parameters. :)



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