NexJ Express

Introduction

NexJ Express Server is a J2EE-based server software which provides cost effective services for deploying highly-scalable, fault tolerant, distributed enterprise solutions. It encapsulates the key aspects of the NexJ Application Framework and enables the advanced business logic, multiple database connectivity, advanced workflow and rules, rich integration, and enhanced data security that are the hallmarks of all solutions that are configured using NexJ Express Studio.

Contributors

• Jordan Anastasiade
• Grace Batumbya

Projects

JSON Adapter

Goal

Add ability to access NexJ Server objects as JSON via a RESTful web service
current implementation

<?xml version="1.0" encoding="utf-8"?>
<_Collection xmlns="http://www.nexj.com/xml" xmlns:xs="http://www.w3.org/2001/XMLSchema" 
               xmlns:xi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns="http://www.nexj.com/xml">
  <item xi:type="Person">
    <_version>0</_version>
    <_oid>104C083E8A4E8A4AD2BAF3011B6A393C97</_oid>
    <_keys>primaryTelcom</_keys>
    <_keys>primaryLanguage</_keys>
    <_keys>initials</_keys>
    <_values xi:nil="true"/>
    <_values xi:nil="true"/>
    <_values xi:nil="true"/>
    <lastName>Bar</lastName>
    <locking>0</locking>
    <firstName>Foo</firstName>
    <company>
      <_version>0</_version>
      <_oid>10209394A0D92641BC9E0FCF36DDAD1C23</_oid>
    </company>
  </item>
</_Collection>

JSON implementation

{
    "_Collection": {
        "item": {
            "_keys": ["primaryTelcom", "primaryLanguage", "initials"],
            "type": "Person",
            "locking": 0,
            "_oid": "104C083E8A4E8A4AD2BAF3011B6A393C97",
            "_version": 0,
            "_values": [
		{"nil": true},
		{"nil": true},
		{"nil": true}
	    ],
            "firstName": "Foo",
            "company": {
                "_oid": "10209394A0D92641BC9E0FCF36DDAD1C23",
                "_version": 0
            },
            "lastName": "Bar"
        },
    }
}

Plan

Phase 1: JSON Marshalling

• Develop marshaller to transform NexJ Server Objects (Transfer Objects) into JSON representation
• Develop a J2EE servlet to serve JSON via REST.
• Servlet will implement GET and DELETE methods

Phase 2: JSON UnMarshalling

• Develop an marshaller to tranaform JSON representation into NexJ Server Objects
• Extend servlet to implement POST and PUT methods

Links

JSON
http://www.json.org
http://www.json.org/java
http://http://code.google.com/p/jsonmarshaller/
REST
http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm
http://java.sun.com/developer/technicalArticles/WebServices/restful/
http://en.wikipedia.org/wiki/Representational_State_Transfer