How to retrieve a (graph connecion) static server variable from GWT RequestFactory

Hi,

I know this concern a bit more GWT...

I am developing my first CWT app. And i use RequestFactory.

I take the example from "GWT In action second Edition".

Inside the ContactService class where are the methods to access the database i wish to connect Neo4J Graph.

In th construstor i added this

/---------------------------------

         private static GraphDatabaseService graphDB;

public ContactService () {

String DB_PATH = "/home/myName/Developer/Workspace/MyGWTApp/DATA";

graphDB = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);

}

 

/---------------------------------------------

I can CRUD with passing the static variable graphDB to the method, fetch(graphDB, id), persist(graphDB, c), and so on...

All is working well. The first time the constructor give me a link the the graph.

My problem is when i develop another service class by example FriendService i need again my connection to graphDB.

I cannot recreate the same thing with the constructor 

/---------------------------------

         private static GraphDatabaseService graphDB;

public FriendService () {

String DB_PATH = "/home/myName/Developer/Workspace/MyGWTApp/DATA";

graphDB = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);

}

 

/---------------------------------------------

That is normal with Neo4J. I must retrieve only the value of my static variable graphDB.

But how to do that?

I trie to create a servlet like that

/********************************************

import javax.servlet.ServletContext;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import org.neo4j.graphdb.GraphDatabaseService;

import org.neo4j.graphdb.factory.GraphDatabaseFactory;

public class Neo4jServletContextListener implements ServletContextListener{

 

public static GraphDatabaseService getGraphDB(ServletContext context) {

return (GraphDatabaseService) context.getAttribute("neo4j");

}

@Override

public void contextDestroyed(ServletContextEvent arg0) {

getGraphDB(arg0.getServletContext()).shutdown();

//System.out.println("ServletContextListener destroyed");

}

 

@Override

public void contextInitialized(ServletContextEvent arg0) {

String DB_PATH = "/home/myName/Developer/Workspace/MyGWTApp/DATA";

GraphDatabaseService graphDB = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);

ServletContext context = arg0.getServletContext();

context.setAttribute ("neo4j", graphDB);

//System.out.println("ServletContextListener started");

}

}

/***********************************************************

But it is impossible to make this

graphDB = (GraphDatabaseService) getServletContext().getAttribute("neo4j");

Could you help me please.

Thanks.

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