I have question concerning mappings in EJB3. I found examples with mappings, where the values are entity beans. I would like to define a mapping with primitive types like java.lang.String. My example is the following:

package bean;

import java.io.Serializable;
import java.util.Map;
import javax.persistence.*;
import org.hibernate.annotations.CollectionOfElements;

@Entity
public class Test implements Serializable {

private int id;
private Map<java.lang.String,java.lang.String> texts;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public int getId()
{
return id;
}

public void setId(int id)
{
this.id = id;
}

@CollectionOfElements
@MapKey
public Map<java.lang.String,java.lang.String> getTexts()
{
return texts;
}

public void setTexts(Map<java.lang.String,java.lang.String> texts)
{
this.texts = texts;
}
}

and I use jboss-4.0.4RC1 with the "all" configuration. While deploying I
get with the mentioned settings the following errors:

19:17:28,812 WARN [ServiceController] Problem starting service persistence.units:unitName=tempdb
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:585)
....
Caused by: org.hibernate.AnnotationException: Associated class not found: java.lang.String
at org.hibernate.cfg.annotations.MapBinder.bindKeyFromAssociationTable(MapBinder.java:65)
at org.hibernate.cfg.annotations.MapBinder.access$000(MapBinder.java:32)
at org.hibernate.cfg.annotations.MapBinder$1.secondPass(MapBinder.java:55)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:35)
at org.hibernate.cfg.annotations.CollectionBinder.bind(CollectionBinder.java:331)
at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1296)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:629)
...

Please could you tell me how to define a mapping with Strings as values?

Thanks in advance!