[google-appengine] javax.jdo.JDOUserException: CreatorExpression defined with class of sKey yet this class is not found

[1010111]

Hi,

I am trying to develop an app in java on App Engine, but i getting
this annoying error over and over, i couldn't find the solution
anywhere in google's search engine.

Here is what i make:
1. I use eclipse and created a class name News.java

======================================================
package ultra.robot.wars.omega;

import java.util.Date;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.users.User;

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class News {
        @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Long newsKey;

    @Persistent
    private User author;

    @Persistent
    private String newsTitle;

    @Persistent
    private String newsContent;

    @Persistent
    private String newsImagePath;

    @Persistent
    private Date date;

    @Persistent
    private int version;

    public News(User author, String nTitle, String nContent, String
nImagePath, Date date, int version){
        this.author = author;
        this.newsTitle = nTitle;
        this.newsContent = nContent;
        this.newsImagePath = nImagePath;
        this.date = date;
        this.version = version;
    }

    public User getAuthor(){
        return author;
    }

    public String getNewsTitle(){
        return newsTitle;
    }

    public String getNewsContent(){
        return newsContent;
    }

    public String getNewsImagePath(){
        return newsImagePath;
    }

    public Long getNewsKey(){
        return newsKey;
    }

    public Date getDate(){
        return date;
    }

    public int getVersion(){
        return version;
    }

    public void setAuthor(User usr){
        this.author = usr;
    }

    public void setNewsTitle(String nTitle){
        this.newsTitle = nTitle;
    }

    public void setNewsContent(String nContent){
        this.newsContent = nContent;
    }

    public void setNewsImagePath(String nImagePath){
        this.newsImagePath = nImagePath;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    public void setVersion(int version) {
        this.version = version;
    }
}
============================================================

2. When i query it from jsp like this:
===================================================================================
PersistenceManager pm2 = PMF.get().getPersistenceManager();
String query2 = "select from " + News.class.getName() + " where
newsKey == " + newskey;
List<News> news2 = (List<News>) pm2.newQuery(query2).execute();
===================================================================================

then it always give me the error javax.jdo.JDOUserException:
CreatorExpression defined with class of sKey yet this class is not
found, i notice that the sKey is the substring of newsKey in the where
clause, i don't know why it think sKey is a class, but if the query
didn't include where clause, it didn't give such error

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