java.lang.NullPointerException: This exception has no message.

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at java.util.HashMap.eq(
at java.util.HashMap.get(
at org.hibernate.mapping.Table.createForeignKey(
at org.hibernate.mapping.SimpleValue.createForeignKeyOfEntity(
at org.hibernate.mapping.Collection.createForeignKeys(
at org.hibernate.mapping.Collection.createAllKeys(
at org.hibernate.cfg.HbmBinder$SecondPass.doSecondPass(
at org.hibernate.cfg.Configuration.secondPassCompile(
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.afterPropertiesSet(

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