Red Hat and Oracle: Delivering on the Promise of Interoperability in Java EE 7

Red Hat and Oracle:
Delivering on the Promise of
Interoperability in Java EE 7
Petr Jiricka, Oracle
Max Andersen, Red Hat

* Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
The following is intended to outline our general product direction. It is intended
for information purposes only, and may not be incorporated into any contract.
It is not a commitment to deliver any material, code, or functionality, and
should not be relied upon in making purchasing decisions. The development,
release, and timing of any features or functionality described for Oracle’s
products remains at the sole discretion of Oracle.

Program Agenda
■ History of vendor-specific J2EE/Java EE
■ Java EE 6
■ Java EE 7
■ JBoss and GlassFish interoperability

Remember this?

Maven
● Unifies dependency management
● Functional Java EE 7 API’s are now available in Maven Central
● Unified build
● Unified Examples
The thing to love or hate...

JBoss Way - JavaEE Examples (and more)
http://www.jboss.org/developer/

Oracle JavaEE 7 Examples
https://github.com/arun-gupta/javaee7-samples

The Example
KitchenSink - Java EE

Copyright © 2012, Oracle and/or its affiliates. All rights reserved.
Java EE 7
WebSocket
JSON
Simplified JMS
Batch
Concurrency Utilities
CDI
JAX-RS
JPA
...and more

JPA - Persistence.xml
<persistence version="2.1"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="primary">

<properties>

<property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>

<property name="javax.persistence.sql-load-script-source" value="import.sql"/>
</properties>
</persistence-unit>
</persistence>
● Default datasource
● Standard schema generation configuration
● sql-load scripting

JSON - Parsing
URLConnection connection = new URL("https://api.github.com/search/users?q=" + member.getName()).
openConnection();
try(InputStream stream = connection.getInputStream()) {
JsonReader reader = Json.createReader(stream);
JsonObject jsonObject=reader.readObject();
if(jsonObject.containsKey("items")) {
JsonArray items = jsonObject.getJsonArray("items");
if(items.size()>0) {
avatar = items.getJsonObject(0).getString("avatar_url");
}
}
}
● Parsing of JSON
● Navigation of JSonObjects

JSON - Writing
final JsonObjectBuilder builder = Json.createObjectBuilder();
builder.add("name", m.getName());
builder.add("email", m.getEmail());
builder.add("phoneNumber", m.getPhoneNumber());
try (JsonWriter jw = factory.createWriter(writer)) {
jw.writeObject(builder.build());
}
● Easily write out JSON structures

Batch - Background Jobs
● Long running background jobs
● Fine vs Coarse grained setup
● Can be suspended by the Container

Batch - Background Jobs
● On member registered
○ Start background job
○ Pull github for avatar images
○ Store image in map from id to avatar used in table
META-INF/batch-jobs/lookupgithub.xml:
<job id="lookupgithub" xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="1.0">
<step id="findgithub" >
<batchlet ref="githubBatchlet"/>
</step>
</job>
@Named
public class GithubBatchlet extends AbstractBatchlet {
@Inject
private MemberRepository repository;
@Override
public String process() throws Exception {
...
}
}

Batch - Background Jobs on Steroids...
● Long running background jobs
● Fine vs Coarse grained setup
● Can be suspended by the Container

WebSocket
■ Bi-directional communication over HTTP port
‒ Handshake to ensure both sides support WebSocket
‒ “Protocol upgrade” from HTTP
‒ Simple bidirectional messages, no headers
■ Server-side API for WebSocket in Java EE 7
‒ Server endpoint: @javax.websocket.server.ServerEndpoint
‒ Message encoders and decoders
■ Client-side API in JavaScript supported by modern browsers
■ In the KitchenSink example
‒ When a new member is registered, the server sends a WebSocket
notification about it to all clients who follow the “live log”

WebSocket - Server
@ServerEndpoint(
value = "/registration",
encoders = {MemberEncoder.class})
public class RegistrationEndpoint {
@OnMessage
public String onMessage(String message, Session s) {
System.out.println("received: " + message);
handleLoginRequest(s);
return "received!";
}
}
● ServerEndPoints registered via annotations
● Methods for close, open, message etc.

WebSocket - Client
self.websocket = new WebSocket("ws://localhost/app/registration");
self.websocket.onopen = function (evt) {
console.log ('open');
window.mm.websocket.send("sending");
console.log('sent');
};
self.websocket.onmessage = function (evt) {
console.log(evt);
var m = new Member();
var dataobj = JSON.parse(evt.data);
m.name(dataobj.name);
m.email(dataobj.email);
m.phoneNumber(dataobj.phoneNumber);
window.mm.addItem(m);
};
● On Member created
○ receive message
○ refresh table livelog

*
Technology GlassFish implementation
JBoss (Wildfly)
implementation
JAX-RS Jersey RESTEasy
JPA EclipseLink Hibernate
Bundled database Derby H2
JSF Mojarra Mojarra
HTTP stack Grizzly Undertow
WebSocket Tyrus Undertow
Batch JBatch (IBM) JBaret
Implementation may be different...
… but both behave according to the specification

*
IDE support for Java EE 7 servers
Server Eclipse IDE NetBeans IDE
GlassFish GlassFish 4 (Java EE 7)
plugin by Oracle
GlassFish 4 (Java EE 7)
integration built in
JBoss JBoss Tools by RedHat
● JBoss 7 (Java EE 6)
supported now
● Wildfly 8 (Java EE 7)
early access
JBoss integration built in
● JBoss 7 (Java EE 6)
supported now
● Wildfly 8 (Java EE 7)
not supported yet

Are we there yet ?
Java EE 7 makes it easier than ever, but…
Everything isn’t covered by spec
Software are written by humans

Q & A
Example: https://github.com/maxandersen/jboss-as-
quickstart/tree/j1ee7
Arun Java EE 7 examples:
https://github.com/arun-gupta/javaee7-samples
JBoss Way Quickstarts:
http://www.jboss.org/developer/quickstarts.html
https://github.com/jboss-developer/jboss-eap-quickstarts

Red Hat and Oracle: Delivering on the Promise of Interoperability in Java EE 7

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Red Hat and Oracle: Delivering on the Promise of Interoperability in Java EE 7