[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-554) NPE with @Id on @OneToOne

NPE with @Id on @OneToOne ------------------------- Key: ANN-554 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-554 Project: Hibernate Annotations Issue Type: Bug Components: binder Affects Versions: 3.2.1 Environment: Hibernate 3.2.2 GA, Hibernate Annotations 3.2.1, J2SE 1.6.0-b105 on Debian GNU/Linux sid, PostgreSQL 7.4 Reporter: Loïc Minier Assignee: Emmanuel Bernard Priority: Minor Fix For: 3.3.0.ga Hi, (Note: I originally reported this on the forum, but the lack of response suggests this might be a bug in Hibernate Annotations or Hibernate; the forum topic is at: http://forum.hibernate.org/viewtopic.php?t=970823) I hope it's not a misuse of Hibernate, but I'm trying to use @Id on @OneToOne, and this causes the following NPE when running hbm2ddl: java.lang.NullPointerException at org.hibernate.util.StringHelper.qualify(StringHelper.java:264) at org.hibernate.cfg.OneToOneSecondPass.doSecondPass(OneToOneSecondPass.java:196) at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:296) at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1115) at org.hibernate.tool.ant.ConfigurationTask.getConfiguration(ConfigurationTask.java:56) at org.hibernate.tool.ant.HibernateToolTask.getConfiguration(HibernateToolTask.java:287) at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:45) at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:171) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) at org.apache.tools.ant.Task.perform(Task.java:364) at org.apache.tools.ant.Target.execute(Target.java:341) at org.apache.tools.ant.Target.performTasks(Target.java:369) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216) at org.apache.tools.ant.Project.executeTarget(Project.java:1185) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40) at org.apache.tools.ant.Project.executeTargets(Project.java:1068) at org.apache.tools.ant.Main.runBuild(Main.java:668) at org.apache.tools.ant.Main.startAnt(Main.java:187) at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246) at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67) What I'm trying to do at the application level is: Foo class and table long foo_id, primary key FooData fooData, nulllable=true FooData class and table foo_id references Foo(foo_id), nullable=false This is expressed in Java as: @Entity @Table(name = "foo") public class Foo { @Id @GeneratedValue @Column(name = "foo_id") Long id; @OneToOne(mappedBy = "foo", cascade = CascadeType.ALL) FooData fooData; ... @Entity @Table(name = "foo_data") public class FooData { @Id @OneToOne @JoinColumn(name = "foo_id", nullable = false) Foo foo; This causes a NPE here. If I use a real Id on FooData, e.g.: @Id @Column(name = "foo_data_id") Long id; it works, and I end up with: - foo_id in table foo as a primary key - foo_data_id in table foo_data as a primary key - foo_id in table foo_data not null - foo_id in table foo_data references foo_id in table foo I don't want a foo_data_id, I don't need it, hence the lack of it which leads to the NPE. Bye,