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

NPE when using composite-map-key and composite-element together in a map ------------------------------------------------------------------------ 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. :)