We are reporting an issue during the database schema generating process using hbm2ddl tools against some entities using single-table inheritance strategy. It works fine for the simple hierarchy entity mappings. It breaks down when we try to modeling the data using single-table inheritance in relational entities. Here is one example:
The main object:
Code:
@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorValue("S")
public class MySub1 extends AbstractMySuper {
@ManyToOne(fetch = FetchType.EAGER)
private MySub1 underlying;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy="mysub1")
private List<ExcludedMySub1> excludedSub1;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy="mysub1")
private List<IncludedMySub1> includedSub1;
...
}
The relationship super-class:
Code:
@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="myType",discriminatorType=DiscriminatorType.STRING, length=1)
public abstract class AbstractMySub1 {
@Id
@SequenceGenerator(name = "AbstractMySub1", sequenceName = "AbstractMySub1_id")
@GeneratedValue(generator = "AbstractMySub1")
@Column(precision=5)
private int id;
@ManyToOne(cascade={CascadeType.PERSIST,CascadeType.MERGE, CascadeType.REFRESH})
private MySub1 mysub1;
...
}
The relationship sub-classes:
Code:
@Entity
@DiscriminatorValue("I")
public class IncludedMySub1 extends AbstractMySub1 {
}
@Entity
@DiscriminatorValue("E")
public class ExcludedMySub1 extends AbstractMySub1 {
}
I got the following error:
Code:
[hibernatetool] Problems in creating a configuration for JPA. Have you remembered to add hibernate EntityManager jars to the classpath ?
[hibernatetool] java.lang.reflect.InvocationTargetException
[hibernatetool] javax.persistence.PersistenceException: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: ExcludedMySub1.mysub1 in MySub1.excludedSub1
[hibernatetool] org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: ExcludedMySub1.mysub1 in MySub1.excludedSub1
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error executing ant tasks
Embedded error: Problems in creating a configuration for JPA. Have you remembered to add hibernate EntityManager jars to the classpath ?
mappedBy reference an unknown target entity property: ExcludedMySub1.mysub1 in MySub1.excludedSub1
[INFO] ------------------------------------------------------------------------
[INFO] Trace
org.apache.maven.lifecycle.LifecycleExecutionException: Error executing ant tasks
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:583)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:499)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:478)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:287)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.plugin.MojoExecutionException: Error executing ant tasks
at org.apache.maven.plugin.antrun.AbstractAntMojo.executeTasks(AbstractAntMojo.java:114)
at org.apache.maven.plugin.antrun.AntRunMojo.execute(AntRunMojo.java:83)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558)
... 16 more
Caused by: Problems in creating a configuration for JPA. Have you remembered to add hibernate EntityManager jars to the classpath ?
at org.hibernate.tool.ant.JPAConfigurationTask.createConfiguration(JPAConfigurationTask.java:57)
at org.hibernate.tool.ant.ConfigurationTask.getConfiguration(ConfigurationTask.java:54)
at org.hibernate.tool.ant.HibernateToolTask.getConfiguration(HibernateToolTask.java:302)
at org.hibernate.tool.ant.Hbm2DDLExporterTask.execute(Hbm2DDLExporterTask.java:45)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:186)
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.taskdefs.Sequential.execute(Sequential.java:64)
at net.sf.antcontrib.logic.IfTask.execute(IfTask.java:197)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.TaskAdapter.execute(TaskAdapter.java:123)
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.maven.plugin.antrun.AbstractAntMojo.executeTasks(AbstractAntMojo.java:108)
... 19 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.hibernate.tool.ant.JPAConfigurationTask.createConfiguration(JPAConfigurationTask.java:43)
... 36 more
Caused by: javax.persistence.PersistenceException: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: ExcludedMySub1.mysub1 in MySub1.excludedSub1
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:258)
... 41 more
Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property:ExcludedMySub1.mysub1 in MySub1.excludedSub1
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:552)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:517)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1136)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:316)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1121)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1269)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:150)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:888)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:186)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:246)
... 41 more
[INFO] ------------------------------------------------------------------------
We need help to find out what is the cause of this error and how to resolve it. Thanks.
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