Having some Persistence Problems...

Hi,

I'm quite new at GWT and JDO Development so please excuse my little question :)

I have a User class for storing User Objects at the App Engines Datastore. 

This it was the User class looks like:

package ldk.shared.persistent;

import java.io.Serializable;

import javax.jdo.annotations.Extension;

import javax.jdo.annotations.IdGeneratorStrategy;

import javax.jdo.annotations.PersistenceCapable;

import javax.jdo.annotations.Persistent;

import javax.jdo.annotations.PrimaryKey;

@PersistenceCapable

public class User implements Serializable {

@PrimaryKey

@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)

    @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true")

    private String encodedKey;

@Persistent

private String lastName;

@Persistent

private String fName;

    @Persistent

private String eMailAdress;

@Persistent

private String passWord;

public User() {

lastName = new String();

foreName = new String();

eMailAdress = new String();

passWord = new String();

}

public String getLastName() {

return lastName;

}

public void setLastName(String lastName) {

this.lastName = lastName;

}

public String getFName() {

return fName;

}

public void setFName(String fName) {

this.fName = fName;

}

public String geteMailAdress() {

return eMailAdress;

}

public void seteMailAdress(String eMailAdress) {

this.eMailAdress = eMailAdress;

}

public String getPassWord() {

return passWord;

}

public void setPassWord(String passWord) {

this.passWord = passWord;

}

public String getKey()

{

return encodedKey;

}

public void setKey(String key)

{

encodedKey = key;

}

}

Storing Objects of this class works fine.

Then I got a Relation Class storing 2 Instances of the User class:

package ldk.shared.persistent;

import java.io.Serializable;

import java.util.Date;

import javax.jdo.annotations.Extension;

import javax.jdo.annotations.IdGeneratorStrategy;

import javax.jdo.annotations.PersistenceCapable;

import javax.jdo.annotations.Persistent;

import javax.jdo.annotations.PrimaryKey;

@PersistenceCapable

public class FollowerRelationships implements Serializable {

/**

* 

*/

private static final long serialVersionUID = 1L;

@PrimaryKey

@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)

    @Extension(vendorName="datanucleus", key="gae.encoded-pk", value="true")

    private String encodedKey;

@Persistent

private User requester;

@Persistent

private User receiver;

@Persistent

private boolean approved;

@Persistent

private Date requestDate;

@Persistent

private Date approveDate;

public FollowerRelationships()

{

requester = null;

receiver = null;

requestDate = new Date();

approveDate = new Date();

}

public boolean isApproved() {

return approved;

}

public void setApproved(boolean approved) {

this.approved = approved;

}

public Date getRequestDate() {

return requestDate;

}

public void setRequestDate(Date requestDate) {

this.requestDate = requestDate;

}

public Date getApproveDate() {

return approveDate;

}

public void setApproveDate(Date approveDate) {

this.approveDate = approveDate;

}

public String getEncodedKey()

{

return encodedKey;

}

public void setEncodedKey(String encodedKey)

{

this.encodedKey = encodedKey;

}

public User getRequester()

{

return requester;

}

public void setRequester(User requester)

{

this.requester = requester;

}

public User getReceiver()

{

return receiver;

}

public void setReceiver(User receiver)

{

this.receiver = receiver;

}

}

That's the process I fail at:

1. I get 2 users from the datastorage by query - works fine

2. I create a new Instance of this relation class and set receiver and requester to these 2 users - work fine

3. Then I store the relation class to the datastore. Here comes my problem:

By storing the relationclass to the datastore 2 new user objects are stored instead of referring to my 2 users I set to this class.

How can I tell jdo to refer to my existing users instead of creating new ones?

I hope you can help me a little bit. Many thanks in advance and have a nice day

Robert

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