NullPointerException when using a 'one-to-many bag' in a 'component' inside a 'dynamic-component' ------------------------------------------------------------------------------------------------- Key: HHH-128 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-128 Project: Hibernate Core Issue Type: Patch Components: core Affects Versions: 3.0 beta 4 Environment: Hibernate 3.0 beta 3, HSQLDB, Java 1.4 Reporter: Daniel Seiler Assignee: Gavin King Priority: Minor Fix For: 3.0 beta 4 Attachments: dynamiccomponent-test.zip, dynamiccomponent-test2.zip Original Estimate: 2h Remaining Estimate: 2h Problem: When I call the method Configuration.addXML(...) with the mapping file showed below I get a NullPointerException (see Stack Trace). The Exception seams only to occur if I try to model a one to many relationship inside a component which is par of a dynamic component. Possible Solution: I figured out that if I change the code in the method bindComponent(...) of the class org.hibernate.cfg.HbmBinder.java from: ... else if ( classNode != null ) { component.setComponentClassName( getClassName( classNode, mappings ) ); } ... to: ... else if ( classNode != null ) { parentClass = getClassName( classNode, mappings ); component.setComponentClassName( parentClass ); } ... Since the NullPointer was caused by the parentClass that was null. I don't know if my fix is the proper solution to the problem but I tried it out and it worked. Please have a look. thanks Daniel Mapping File: <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping default-lazy="false"> <class name="ch.truesolutions.hibernate.Artifact" table="ZOO1" entity-name="ZOO1"> <id name="id" type="long" unsaved-value="0" > <generator class="native"/> </id> <dynamic-component name="groupLists"> <component name="address" class="ch.truesolutions.hibernate.GroupList"> <bag name="groups" cascade="save-update" lazy="false"> <key column="ZOO1_ID"/> <one-to-many entity-name="ADDRESS1"/> </bag> </component> </dynamic-component> </class> <class name="ch.truesolutions.hibernate.Group" entity-name="ADDRESS1" table="ADDRESS1" > <id name="id" type="long" unsaved-value="0" > <generator class="native"/> </id> ... </class> </hibernate-mapping> Full stack trace of any exception that occurs: ERROR [main] (Configuration.java:304) - Could not configure datastore from XML java.lang.NullPointerException at org.hibernate.util.StringHelper.qualify(StringHelper.java:201) at org.hibernate.cfg.HbmBinder.bindCollection(HbmBinder.java:914) at org.hibernate.cfg.HbmBinder$4.create(HbmBinder.java:2193) at org.hibernate.cfg.HbmBinder.bindComponent(HbmBinder.java:1287) at org.hibernate.cfg.HbmBinder.bindComponent(HbmBinder.java:1315) at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:1490) at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:589) at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:1848) at org.hibernate.cfg.Configuration.add(Configuration.java:344) at org.hibernate.cfg.Configuration.addXML(Configuration.java:301) at ch.truesolutions.hibernate.HibernateHelper.<init>(HibernateHelper.java:65) at ch.truesolutions.hibernate.HibernateHelper.getInstance(HibernateHelper.java:56) at ch.truesolutions.hibernate.TestHibernate.main(TestHibernate.java:39) ERROR [main] (HibernateHelper.java:77) - Building SessionFactory failed. org.hibernate.MappingException: java.lang.NullPointerException at org.hibernate.cfg.Configuration.addXML(Configuration.java:305) at ch.truesolutions.hibernate.HibernateHelper.<init>(HibernateHelper.java:65) at ch.truesolutions.hibernate.HibernateHelper.getInstance(HibernateHelper.java:56) at ch.truesolutions.hibernate.TestHibernate.main(TestHibernate.java:39) Caused by: java.lang.NullPointerException at org.hibernate.util.StringHelper.qualify(StringHelper.java:201) at org.hibernate.cfg.HbmBinder.bindCollection(HbmBinder.java:914) at org.hibernate.cfg.HbmBinder$4.create(HbmBinder.java:2193) at org.hibernate.cfg.HbmBinder.bindComponent(HbmBinder.java:1287) at org.hibernate.cfg.HbmBinder.bindComponent(HbmBinder.java:1315) at org.hibernate.cfg.HbmBinder.createClassProperties(HbmBinder.java:1490) at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:589) at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:1848) at org.hibernate.cfg.Configuration.add(Configuration.java:344) at org.hibernate.cfg.Configuration.addXML(Configuration.java:301)