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JavaEE and RESTful development - WSO2 Colombo Meetup
This document discusses RESTful development and JavaEE concepts. It begins with an introduction to REST and provides an example to distinguish RESTful and non-RESTful architectures. It then covers JavaEE topics like JAX-RS, dependency injection, and integrating JAX-RS services with JPA DAO services using CDI. The document also describes features of the WSO2 Application Server like multi-tenancy support, multiple classloading runtimes, and monitoring capabilities.
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JavaEE and RESTful development - WSO2 Colombo Meetup
- 1. Sagara Gunathunga JavaEE and RESTful development
- 2. • RESTfull development • Introduction to JavaEE • Context and Dependency Injection • WSO2 Application Server 2 Agenda
- 3. 3 REST REpresentational State Transfer “An architecture style of networked systems”
- 4. 4 REST Let’s take an example REpresentational State Transfer An architecture style of networked systems
- 5. Premier Cooperate Regular Customer Care Answering Machine Regular Customer Representative Premier Customer Representative Cooperate Customer Representative • Example -Customer care system of a bank - The bank provides a single telephone number REST
- 6. Premier Cooperate Regular Answering Machine Regular Customer Representative Premier Customer Representative Cooperate Customer Representative REST Answering Machine Answering Machine • Example - Customer care system of a bank - The bank provides a multiple(unique) telephone numbers
- 7. Premier Cooperate Regular Customer Care Answering Machine Regular Customer Representative Premier Customer Representative Cooperate Customer Representative • Example -Customer care system of a bank - The bank provides a single telephone number REST Not REST
- 8. Premier Cooperate Regular Answering Machine Regular Customer Representative Premier Customer Representative Cooperate Customer Representative REST Answering Machine Answering Machine • Example - Customer care system of a bank - The bank provides a multiple(unique) telephone numbers REST
- 9. Resources Every disAnguishable enAty is a resource. A resource may be a Web site, an HTML page, an XML document, a Web service, a physical device, etc. URLs Iden4fy Resources Every resource is uniquely idenAfied by a URL. 9 REST Fundamentals
- 10. 10 REST HTTP Request/Response
- 11. 11 REST HTTP Request/Response
- 12. 12 HTTP MethodCRUD Desc. POST CREATE Create - GET RETRIEVE Retrieve Safe,Idempotent,Cacheable PUT UPDATE Update Idempotent DELETE DELETE Delete Idempotent REST HTTP Methods
- 13. 13 REST Fundamentals • Client-Server • Separation principle • Components Independent • Stateless • Session state on the client • Visibility, reliability and scalability • Trade off (network performance, etc.) • Cacheable • A response can be cacheable • Efficiency but reduce reliability • Layered system • System scalability •
- 14. 14 JAX-‐RS – Java API for RESTfull WebServices • Annotation driven API • Expose annotated Java bean as HTTP based services • Implementation may support WADL • Define JAVA ó HTTP mapping • Number of implementations • Apache CXF • Apache Wink • Jersey
- 15. JAX-‐RS JAX-RS AnnotatedService @Path("/hello”) public class HelloWorldService { @GET @Path("/{user}") public String hello(@PathParam("user") String user) { } }
- 16. 16 JAX-‐WS Annota4ons • @Path • @GET • @PUT • @POST • @DELETE • @Produces • @Consumes • @PathParam • @QueryParam • @MatrixParam • @HeaderParam • @CookieParam • @FormParam • @DefaultValue • @Context
- 17. JAX-‐RS JAX-RS AnnotatedService @Path("/hello”) public class HelloWorldService { @GET @Consumes("text/plain") @Produces("text/xml") @Path("/{user}") public String hello(@PathParam("user") String user) { } }
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- 20. 20 JavaEE – Example Student REST Service Student DatabaseClients Let’s take an example
- 21. 21 JAX-RS serviceto accept HTTP calls JavaEE – Example @Path("/student”) public class HelloWorldService { @GET @Path(”getall") @Produces({"application/json”}) public String getAll() { } }
- 22. 22 JavaEE – Example @Stateful public class StudentManagerImpl implements StudentManager { @PersistenceContext(unitName = "rest-jpa”) private EntityManager entityManager; public Student getStudent(int index) { Student student = entityManager.find(Student.class, index); return student; } } JPA based data access service
- 23. 23 JavaEE – Example How to integrate JAX-RS service with JPA DAO service ? JAX-RS service JPA service
- 24. 24 JavaEE – Example integra4on @Path("/student”) public class HelloWorldService { StudentManager sm; public HelloWorldService() { sm = new StudentManagerImpl(); } @GET @Path(”getall") @Produces({"application/json”}) public String getAll() { } } How to integrate JAX-RS service with JPA DAO service ? Pure JAVA
- 25. 25 JavaEE – Example integra4on @Path("/student”) public class HelloWorldService { StudentManager sm; public void setStudentManager (StudentManager sm) { } public StudentManager setStudentManager () { } @GET @Path(”getall") @Produces({"application/json”}) public String getAll() { } } How to integrate JAX-RS service with JPA DAO service ? Spring Framework
- 26. 26 JavaEE – Example integra4on @Path("/student”) public class HelloWorldService { @Inject StudentManager sm; @GET @Path(”getall") @Produces({"application/json”}) public String getAll() { } } How to integrate JAX-RS service with JPA DAO service ? JavaEE CDI
- 27. 27 JavaEE – Example integra4on How to integrate JAX-RS service with JPA DAO service ?JAX-RS service JPA service CDI
- 28. 28 JavaEE – Context and Dependency InjecAon @Decorator @Delegate @ApplicationScoped @ConversationScoped @Dependent @NormalScope @RequestScoped @SessionScoped @Observes @Alternative @Any @Default @Disposes @Model @New @Produces @Specializes @Stereotype @Typed @inject @Named @Qualifier @Scope @Singleton
- 29. 29 WSO2 Applica4on Server Yet another app server ?
- 30. • Tenant-aware datasources • Tenant-aware JNDI service • Tenant-aware session persistence • Tenant-aware user store • Tenant-aware authentication and authorization • Tenant-aware Caching • Tenant-aware configuration registry • Tenant-aware dashboards • Tenant-aware management console JavaEE – MulA-‐tenancy support
- 31. MulAple classloading runAmes There are four in-built environments • Tomcat – Only Tomcat libs are visible (Minimal runtime) • Carbon – Tomcat + Carbon libs are visible • CXF - Tomcat + CXF + Spring are visible • Javaee – JavaEE libs are visible
- 32. MulAple classloading runAmes Ability to create your own custom ‘Classloader Runtime environments’ • Create directory to place your Jar dependencies • Add an entry to webappclassloading- environments.xml file e.g. –You can have number of incompatible versions of Spring frameworks in server level
- 33. Server-‐side JavaScript • Develop complete server side application using Jaggery.js and deploy on Application Server • Web Applications • RESTfull services • WebSocket services
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- 35. JavaEE Web Profile support
- 36. Web Service development • Supported web service development models • JAX –WS ( based on Apache CXF) • Apache Axis2 • Bring your own WS framework • Metro, Spring WS • Rich dashboard and development tools • Try-It tool support • Download WS client as maven project • Basic statistics • Service publish and discovery support through WSO2 Governance Registry • WS – Discovery supported
- 37. RESTfull service development • Supported RESTfull service development models. • JAX –RS ( based on Apache CXF) • Apache Axis2 REST services • Jaggery REST services ( Java Script ) • • Bring your own WS framework • Jersey, Rest Easy, Restlet, Spring • Rich dashboard and development tools • Swagger support. • Download REST client as maven project • Basic statistics
- 38. Web Socket development • Supported WebSocket development models • Java API for WebSocket • Jaggery Web Sockets ( Java Script )
- 39. AcAvity and server monitoring • Embedded Monitoring dashboard • Request, response, errors, sessions over time • Geo info , language, referrals • Alerts on thresholds • Server and infrastructure health monitoring.
- 40. AcAvity and server monitoring
- 41. 41 References • https://github.com/wso2as-developer/javaee-samples • https://docs.wso2.com/display/AS521/WSO2+Application+Server +Documentation • http://wso2.com/whitepapers/evaluating-java-ee-application-migration-and-java- ee-service-migration-to-wso2-application-server/
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