SerializationException on the server side

[Richard]

Hi All,

  I've tried my first GWT RPC project without success. I think I'
missing something but I don't find what. Can you help me finding
what's wrong ?

=========== The exception ===========
1 oct. 2009 11:06:18
com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: [1254387978424000] javax.servlet.ServletContext log: Exception
while dispatching incoming RPC call
com.google.gwt.user.client.rpc.SerializationException: Type
'fr.km.server.KMServiceImpl$5' was not included in the set of types
which can be serialized by this SerializationPolicy or its Class
object could not be loaded. For security purposes, this type will not
be serialized.


===========My model ===============
package fr.km.client.model;

import java.util.ArrayList;

import com.google.gwt.user.client.rpc.IsSerializable;

public class Article implements IsSerializable {
        private int id;
        private String title;
        private ArrayList<String> tags;
        private String content;

        public Article() {}

        public Article(int id, String title, ArrayList<String> tags, String
content) {
                this.id = id;
                this.title = title;
                this.tags = tags;
                this.content = content;
        }

        public int getId() {
                return id;
        }

        public String getTitle() {
                return title;
        }

        public ArrayList<String> getTags() {
                return tags;
        }

        public String getContent() {
                return content;
        }


}

=============My RPC Impl        =============
public class KMServiceImpl extends RemoteServiceServlet implements
                KMService {

        public ArrayList<Article> findArticles(String keywords) {
                final Article a = new Article(0, "Title 1", new 
ArrayList<String>()
{{add("J2EE");add("eclipse");}}, "some content");
                final Article b = new Article(0, "Title 2", new 
ArrayList<String>()
{{add("J2EE");add("eclipse");}}, "some content");
                final Article c = new Article(0, "Title 3", new 
ArrayList<String>()
{{add("J2EE");add("eclipse");}}, "some content");
                final Article d = new Article(0, "Title 4", new 
ArrayList<String>()
{{add("J2EE");add("eclipse");}}, "some content");

                return new ArrayList<Article>(){{add(a);add(b);add(c);add(d);}};
        }
}
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