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The [http://bck2brwsr.apidesign.org/javadoc/net.java.html.json/ net.java.html.json] has been primarily designed to run in a [[JSON4Brwsr|browser]]. However almost every application in a browser tries to communicate with some server. The application logic is then split into two distinct systems - yet certain parts of the code need to run on both sides (think about validation - prevalidate on client, re-validate on server, before database is modified). Can we use the same code in browser as well as on server?

== [[Jersey]] Media [[JSON4Brwsr|HTML JSON]] ==

A new module has been donated to [[Jersey]] version 2.1. Just include it on your server own application path as

<source lang="xml">
<dependency>
  <groupId>org.glassfish.jersey.media</groupId>
  <artifactId>html-json</artifactId>
  <version>2.6</version>
  <scope>runtime</scope>
</dependency>
</source>

and you can use classes generated by [[JSON4Brwsr]]'s '''@Model''' annotation as [[Jersey]] entities. Here is a little demo for you to try:

<source lang="bash">
$ hg clone https://hg.java.net/hg/html~demo
$ cd html~demo/chat/server/
$ mvn process-classes exec:java
</source>

The ([[Jersey]] and [[Grizzly]] based) server starts on port 8080. Just open your [[Chrome]] browser (there are some problems with [[Firefox]] and my use of '''XHR''''s ''POST'' method) and point it to ''http://localhost:8080''. In a few seconds, you should see a chat application running via the [[Bck2Brwsr]] [[VM]]. The message is represented by a [https://hg.java.net/hg/html~demo/file/65cadba2cf02/chat/model/src/main/java/org/apidesign/html/chatserver/model/MessageImpl.java Message] class and this class is the same on the server as well as in the browser. It is transmitted in a [[JSON]] format, but it can also contain additional (for example validation or presentation) logic.

Your [[Java]] code can now run on a server as well as get [[Bck2Brwsr]]!


[[Category:OpenSourceContribution]]

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