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Building HTML5 Applications with EclipseLink:

JSON, JAX-RS, JPA & JavaScript

Shaun Smith

shaun.smith@oracle.com

@shaunMsmith

Doug Clarke

Douglas.clarke@oracle.com

@doug_clarke

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JAXB: Java Architecture

Java Persistence: The Problem Space

CUST

ID NAME C_RATING

Relational

Customerid: int

name: StringcreditRating: int

Java

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Software Evolution

Computing architecture is constantly evolving:

Mainframe, client/server, web/thin client, mobile

Current technologies with increasing adoption

Cloud computing

HTML 5

NoSQL databases

Java EE 7 is evolving to address many of theserequirements

EclipseLink JPA and JAXB are also evolving!

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New Features

JSON Binding

RESTful JPAJPA RS

Dynamic

Configuration

Provisioning

NoSQL Database Support

Tenant Isolation

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JSON Binding / EclipseLink JSON-B

Provides Java/JSON binding similar to Eclipse

JAXBs Java/XML binding.

Marshall Java domain model to and from JSON

Currently no Java standardEclipseLink interp

JAXB XML bindings for JSON

Content-type selectable by setting property on

Marshaller/Unmarshaller

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JAXB mapped Java

J

X

XML and JSON from JAXB Mappings

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RESTful JPA

Provides a service that exposes JPA mapped e

over REST via JAX-RS

HTTP message body either XML or JSON

Client

HTML 5 with JavaScript (primary focus)

JavaFX

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JAX-RS with JPAHigh Level Architec

Java EE Server

JDBCHTTP/S

Client R

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JAX-RS with JPA ExampleGET Invoi

public class InvoiceService {...

public Invoice read(int id) {

return null;

}

...

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JAX-RS with JPA ExampleGET Invoi

@Stateless

public class InvoiceService {...

public Invoice read(int id) {

return entityManager.find(Invoice.cla

}

...

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JAX-RS with JPA ExampleGET Invoi

@Path("/invoice")

@Stateless

public class InvoiceService {...

public Invoice read(int id) {

return entityManager.find(Invoice.cla

}

...

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JAX-RS with JPA ExampleGET Invoi

@Path("/invoice")

@Stateless

public class InvoiceService {...

@GET

@Path("{id}")

public Invoice read(@PathParam("id")int i

return entityManager.find(Invoice.cla

}

...

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JAX-RS with JPA ExampleGET Invoi

@Path("/invoice")

@Stateless

public class InvoiceService {...

@GET

@Path("{id}")

@Produces({"application/xml", "application

public Invoice read(@PathParam("id") int i

return entityManager.find(Invoice.cla

}

...

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JAX-RS with JPA ExampleGET Invoi

@Path("/invoice")

@Stateless

public class InvoiceService {...

@GET

@Path("{id}")

@Produces({"application/xml", "application

public Invoice read(@PathParam("id") int i

return entityManager.find(Invoice.cla

}

...GET http://[machine]:[port]/[web-context]/inv

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JAX-RS with JPA

JAX-RS

JPA

Invoice Bean Payment BeanContract Bean

GET http://.../invoice/4

GET http://.../invoice/4

mapped to bean

Accounting PU Human ResourceContracting PU

Bean

uses JPA

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JPA-RS

JPA-RS

JAX-RS

Accounting PU Human ResourceContracting PU

...

JPA

GET http://.../MyApp/Accounting/Inv

JPA-RS maps URI http://.../MyApp/Accoto AccountingPU and Invoiceentity

JAX-RS http://.../MyApp/Accounting/

mapped to JPA-RSservice

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REST Resource Mapping

REST requires URIs for identifiable resources

Resources not 1:1 with classes

may be a graph of closely related objects

Resources are connected via links

Need a way to define Resource Model that can

leveraged by JAXB/JSON Binding

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Resource Model

Maps Java Object Model to REST Resources

O

ResourceModel

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EclipseLink Resource Model

In development

Resources (sub-graphs of domain

graph) can be marshalled andunmarshalled (and reconnected)

Links are being automatically generated

Currently requires use of JAXB annotations

Future: simplify metadata declaration of

resources

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Summary

Java is evolvingand EclipseLink is evolving too

JSON Binding

JPA-RS

REST Resource Mapping

NoSQL

Tenant Isolation

EclipseLink is thecenter of innovation in Java pe