[hibernate-issues] [Hibernate-JIRA] Created: (ANN-630) @ManyToMany and @Index

[Peter K. Guldbæk (JIRA)]

@ManyToMany and @Index
----------------------

                 Key: ANN-630
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-630
             Project: Hibernate Annotations
          Issue Type: Bug
    Affects Versions: 3.3.0.ga
         Environment: Windows Vista
java version "1.5.0_11"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_11-b03)
Java HotSpot(TM) Client VM (build 1.5.0_11-b03, mixed mode)

            Reporter: Peter K. Guldbæk


I have trouble adding an index to a column of a table which is part of a many-to-many property mapping. The following example causes a NullPointerException when generating the DDL (the exception can be seen at the end of my post):

@Entity @Table(name="usr")
public class User implements Serializable
{
    @Id @GeneratedValue(strategy=GenerationType.AUTO)
    public Integer id;
   
    @ManyToMany(targetEntity=Target.class, cascade={})
    @Index(name="fkey_usr_target", columnNames="usr_id")
    @JoinTable(name="usr_target",
        joinColumns=@JoinColumn(name="usr_id"),
        inverseJoinColumns=@JoinColumn(name="target_id"))
    public Collection<Target> targets;
}

@Entity @Table(name="target")
public class Target implements Serializable
{
    @Id @GeneratedValue(strategy=GenerationType.AUTO)
    public Integer id;
   
    @Basic
    public String myValue;
}


NullPointerException thrown when an @Index annotation is used with a @ManyToMany:
java.lang.NullPointerException
        at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1594)
        at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:733)
        at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:498)
        at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)
        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:299)
        at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:45)
        at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:183)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.GeneratedMethodAccessor19.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:357)
        at org.apache.tools.ant.Target.performTasks(Target.java:385)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
        at org.apache.tools.ant.Main.runBuild(Main.java:698)
        at org.apache.tools.ant.Main.startAnt(Main.java:199)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)


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