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

[Serdyn du Toit (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=33073#action_33073 ] 

Serdyn du Toit commented on ANN-554:
------------------------------------

Had a similar error.  I made a few changes to entities without one-to-one mappings.  During attempting to solve this I commented all the one-to-one mappings from OTHER entities - this then gave a different error.

The error is discussed here:
https://svn.cargo.codehaus.org/browse/GRAILS-4215?focusedCommentId=169191&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel

My problem:
I had the jbossall-client.jar on the classpath which references similar classes in similar packages.

Just mentioning this here in case someone with similar issues stumbles upon this page.


> 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,

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