Hi,
I am relatively new to Hibernate annotations, and while I think it is quite a good product I have been puzzled all day today over why this simple code throws a NullPointerException:
Code:
import java.io.Serializable;
import javax.persistence.Embeddable;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.OneToOne;
import javax.persistence.Table;
@Entity
@IdClass(TestPK.class)
@Table(name = "TEST")
public class Test implements Serializable {
private String test;
@Id
@OneToOne
public String getTest() {
return test;
}
public void setTest(String test) {
this.test = test;
}
}
@Embeddable
class TestPK implements Serializable {
private String test;
@OneToOne
public String getTest() {
return test;
}
public void setTest(String test) {
this.test = test;
}
}
The exception:
Code:
java.lang.NullPointerException
at org.hibernate.cfg.AnnotationBinder.bindOneToOne(AnnotationBinder.java
:1867)
at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(Annotati
onBinder.java:1286)
at org.hibernate.cfg.AnnotationBinder.fillComponent(AnnotationBinder.jav
a:1662)
at org.hibernate.cfg.AnnotationBinder.bindId(AnnotationBinder.java:1695)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:66
0)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(Anno
tationConfiguration.java:452)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(Annotatio
nConfiguration.java:268)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1039
)
at org.codehaus.mojo.hibernate3.configuration.AbstractComponentConfigura
tion.getConfiguration(AbstractComponentConfiguration.java:38)
at org.codehaus.mojo.hibernate3.exporter.Hbm2DDLExporterMojo.doExecute(H
bm2DDLExporterMojo.java:87)
at org.codehaus.mojo.hibernate3.HibernateExporterMojo.execute(HibernateE
xporterMojo.java:139)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi
nManager.java:412)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa
ultLifecycleExecutor.java:534)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandalone
Goal(DefaultLifecycleExecutor.java:488)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau
ltLifecycleExecutor.java:458)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan
dleFailures(DefaultLifecycleExecutor.java:306)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen
ts(DefaultLifecycleExecutor.java:273)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi
fecycleExecutor.java:140)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
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)
This error happens when I try to generate the schema using hbm2ddl plugin for maven so I don't know if it's hibernate related or plugin related. I don't get the above exception when I change the association from OneToOne to something else.
My actual code is a bit more complicated than this (I am trying to use a composite primary key), but I reproduced the same problem with the above simple code. Any ideas?
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