Exception while persisting an entity.

[Aman Sharma]

While persisting following entity I am getting a server error : null in GWT 
development console. But on removing the call to pm.persist() everything 
goes right. I have doubts that I have not defined this entity properly. 
Maybe I am using types not supported by Datastore.Or is there anything else 
I am doing wrong? Please please help it's been a week I am following this 
long chain of exceptions with this GWT project.


package com.torrid.gwt.pollingApp.server;


import com.google.appengine.api.datastore.Key;

import javax.jdo.annotations.EmbeddedOnly;
import javax.jdo.annotations.Embedded;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.PrimaryKey;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.Version;
import javax.jdo.annotations.Extension;
import javax.jdo.annotations.VersionStrategy;
import javax.jdo.PersistenceManagerFactory;
import javax.jdo.PersistenceManager;
import javax.jdo.JDOHelper;
import javax.jdo.Query;
import com.torrid.gwt.pollingApp.server.PMF;

import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

@PersistenceCapable
@Version(strategy=VersionStrategy.VERSION_NUMBER, column="VERSION",
         extensions={@Extension(vendorName="datanucleus", key="field-name", 
value="myVersion")})
public class User{
 @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Long id;
    
    protected Long version;
@Persistent
private String name;
 @Persistent
@Embedded
private Password kunji;
    public void setName(String name){
this.name=name;
}
public void setPassword(String pass){
byte[] bSalt;
String salt = null;
String hash = null;
try{
bSalt = PassEncryptionService.generateSalt();
salt = new String(bSalt);
hash = new String(PassEncryptionService.getEncryptedPassword(pass,bSalt));
}
catch(NoSuchAlgorithmException e){
//no idea about what to do yet.
}
catch(InvalidKeySpecException e){
//no idea about what to do yet.
}
kunji=new Password(hash,salt);
}
public String getPassword(){
return "abc";
}
    public String getName(){
return this.name;
}
public Long getId(){
return this.id;
}
 @PersistenceCapable
@EmbeddedOnly
public static class Password{
@Persistent
private String hash;
 @Persistent
private String salt;
 public Password(String hash,String salt){
this.hash=hash; this.salt=salt;
}
 }
public static User findUser(Long id){
if(id==null)
return null;
PersistenceManager pm = PMF.getInstance().getPersistenceManager();
return pm.getObjectById(User.class,id);
}
 public Long getVersion(){
return this.version;
}
 public void persist(){
PersistenceManager pm  = PMF.getInstance().getPersistenceManager();
try{
pm.makePersistent(this);
}
finally{
pm.close();
}
}
 }


package com.torrid.gwt.pollingApp.server;
import javax.jdo.JDOHelper;import javax.jdo.PersistenceManagerFactory;
public final class PMF {
  private static final PersistenceManagerFactory pmfInstance =
    JDOHelper.getPersistenceManagerFactory("transactions-optional");

 private PMF() {}

 public static PersistenceManagerFactory getInstance() {
    return pmfInstance;
 }}


public void persist(){
    PersistenceManager pm  = PMF.getInstance().getPersistenceManager();
    try{
        pm.makePersistent(this);
    }
    finally{
        pm.close();
    }}

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