CXF Webservice Using Embedded Jetty



http://www.javatips.net/blog/2014/06/cxf-webservice-using-embedded-jetty

@BeforeClass
    public static void setUp() throws Exception {

        server = new Server();
        Connector connector = new SelectChannelConnector();
        connector.setPort(9000);
        server.setConnectors(new Connector[] { connector });

        WebAppContext wactx = new WebAppContext();
        wactx.setContextPath("/CXFRestfulTutorial");
        wactx.setWar("CXFRestfulTutorial.war");

        HandlerCollection handlers = new HandlerCollection();
        handlers.setHandlers(new Handler[] { wactx, new DefaultHandler() });
        server.setHandler(handlers);

        try {
            server.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

==========

Going REST: embedding Jetty with Spring and JAX-RS (Apache CXF)

http://www.javacodegeeks.com/2013/01/going-rest-embedding-jetty-with-spring-and-jax-rs-apache-cxf.html

For hardcore server-side Java developer the only way to ‘speak’ out to the world is by using APIs. Today’s post is all about JAX-RS: writing and exposing RESTful services using Java.

But we won’t do that using a traditional, heavyweight approach involving application server, WAR packaging and whatnot. Instead, we will use awesome Apache CXF framework and as always rely on Spring to wire all pieces together. And for sure we won’t stop on that either as we need a web server to run our services on. Using fat or one jar concept we will embed Jetty server into our application and make our final JAR redistributable (all dependencies included) and runnable.
 

It’s a lot of work so let’s get started. As we stated above, we will use Apache CXF, Spring and Jetty as a building blocks so let’s have them described in a POM file. The one additional dependency worth mentioning is excellent Jackson library for JSON processing.

view sourceprint?

001	<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

002	<modelversion>4.0.0</modelversion>

003

004	<groupid>com.example</groupid>

005	<artifactid>spring-one-jar</artifactid>

006	<version>0.0.1-SNAPSHOT</version>

007	<packaging>jar</packaging>

008

009	<properties>

010	<project.build.sourceencoding>UTF-8</project.build.sourceencoding>

011	<org.apache.cxf.version>2.7.2</org.apache.cxf.version>

012	<org.springframework.version>3.2.0.RELEASE</org.springframework.version>

013	<org.eclipse.jetty.version>8.1.8.v20121106</org.eclipse.jetty.version>

014	</properties>

015

016	<dependencies>

017	<dependency>

018	<groupid>org.apache.cxf</groupid>

019	<artifactid>cxf-rt-frontend-jaxrs</artifactid>

020	<version>${org.apache.cxf.version}</version>

021	</dependency>

022

023	<dependency>

024	<groupid>javax.inject</groupid>

025	<artifactid>javax.inject</artifactid>

026	<version>1</version>

027	</dependency>

028

029	<dependency>

030	<groupid>org.codehaus.jackson</groupid>

031	<artifactid>jackson-jaxrs</artifactid>

032	<version>1.9.11</version>

033	</dependency>

034

035	<dependency>

036	<groupid>org.codehaus.jackson</groupid>

037	<artifactid>jackson-mapper-asl</artifactid>

038	<version>1.9.11</version>

039	</dependency>

040

041	<dependency>

042	<groupid>cglib</groupid>

043	<artifactid>cglib-nodep</artifactid>

044	<version>2.2</version>

045	</dependency>

046

047	<dependency>

048	<groupid>org.springframework</groupid>

049	<artifactid>spring-core</artifactid>

050	<version>${org.springframework.version}</version>

051	</dependency>

052

053	<dependency>

054	<groupid>org.springframework</groupid>

055	<artifactid>spring-context</artifactid>

056	<version>${org.springframework.version}</version>

057	</dependency>

058

059	<dependency>

060	<groupid>org.springframework</groupid>

061	<artifactid>spring-web</artifactid>

062	<version>${org.springframework.version}</version>

063	</dependency>

064

065	<dependency>

066	<groupid>org.eclipse.jetty</groupid>

067	<artifactid>jetty-server</artifactid>

068	<version>${org.eclipse.jetty.version}</version>

069	</dependency>

070

071	<dependency>

072	<groupid>org.eclipse.jetty</groupid>

073	<artifactid>jetty-webapp</artifactid>

074	<version>${org.eclipse.jetty.version</version>

075	</dependency>

076	</dependencies>

077

078

<build>

079

<plugins>

080

<plugin>

081	<groupid>org.apache.maven.plugins</groupid>

082	<artifactid>maven-compiler-plugin</artifactid>

083	<version>3.0</version>

084	<configuration>

085	<source>1.6</source>

086	<target>1.6</target>

087	</configuration>

088

</plugin>

089

<plugin>

090	<groupid>org.apache.maven.plugins</groupid>

091	<artifactid>maven-jar-plugin</artifactid>

092	<configuration>

093

<archive>

094	<manifest>

095	<mainclass>com.example.Starter</mainclass>

096	</manifest>

097	</archive>

098	</configuration>

099

</plugin>

100

<plugin>

101	<groupid>org.dstovall</groupid>

102	<artifactid>onejar-maven-plugin</artifactid>

103	<version>1.4.4</version>

104	<executions>

105	<execution>

106	<configuration>

107	<onejarversion>0.97</onejarversion>

108	<classifier>onejar</classifier>

109	</configuration>

110

<goals>

111	<goal>one-jar</goal>

112

</goals>

113	</execution>

114	</executions>

115

</plugin>

116	</plugins>

117

</build>

118

119	<pluginrepositories>

120	<pluginrepository>

121	<id>onejar-maven-plugin.googlecode.com</id>

122	<url>http://onejar-maven-plugin.googlecode.com/svn/mavenrepo</url>

123	</pluginrepository>

124	</pluginrepositories>

125

126	<repositories>

127	<repository>

128	<id>maven2-repository.dev.java.net</id>

129	<url>http://download.java.net/maven/2/</url>

130	</repository>

131	</repositories>

132	</project>

It’s a lot of stuff but should be pretty clear. Now, we are ready to develop our first JAX-RS services by starting with simple JAX-RS application.

view sourceprint?

1	package com.example.rs;

2

3	import javax.ws.rs.ApplicationPath;

4	import javax.ws.rs.core.Application;

5

6	@ApplicationPath( 'api' )

7	public class JaxRsApiApplication extends Application {

8

}

As simple as it looks like, our application defines an /api to be the entry path for the JAX-RS services. The sample service will manage people represented by Person class.

view sourceprint?

01	package com.example.model;

02

03	public class Person {

04	private String email;

05	private String firstName;

06	private String lastName;

07

08	public Person() {

09

}

10

11	public Person( final String email ) {

12	this.email = email;

13

}

14

15	public String getEmail() {

16	return email;

17

}

18

19	public void setEmail( final String email ) {

20	this.email = email;

21

}

22

23	public String getFirstName() {

24	return firstName;

25

}

26

27	public String getLastName() {

28	return lastName;

29

}

30

31	public void setFirstName( final String firstName ) {

32	this.firstName = firstName;

33

}

34

35	public void setLastName( final String lastName ) {

36	this.lastName = lastName;

37

}

38

}

And following bare bones business service (for simplicity, no database or any other storage are included).

view sourceprint?

01	package com.example.services;

02

03	import java.util.ArrayList;

04	import java.util.Collection;

05

06	import org.springframework.stereotype.Service;

07

08	import com.example.model.Person;

09

10

@Service

11	public class PeopleService {

12	public Collection< Person > getPeople( int page, int pageSize ) {

13	Collection< Person > persons = new ArrayList< Person >( pageSize );

14

15	for( int index = 0; index < pageSize; ++index ) {

16	persons.add( new Person( String.format( 'person+%[email protected]', ( pageSize * ( page - 1 ) + index + 1 ) ) ) );

17

}

18

19	return persons;

20

}

21

22	public Person addPerson( String email ) {

23	return new Person( email );

24

}

25

}

As you can see, we will generate a list of persons on the fly depending on the page requested. Standard Spring annotation @Service marks this class as a service bean. Our JAX-RS service PeopleRestService will use it for retrieving persons as the following code demonstrates.

view sourceprint?

01	package com.example.rs;

02

03	import java.util.Collection;

04

05	import javax.inject.Inject;

06	import javax.ws.rs.DefaultValue;

07	import javax.ws.rs.FormParam;

08	import javax.ws.rs.GET;

09	import javax.ws.rs.PUT;

10	import javax.ws.rs.Path;

11	import javax.ws.rs.Produces;

12	import javax.ws.rs.QueryParam;

13

14	import com.example.model.Person;

15	import com.example.services.PeopleService;

16

17	@Path( '/people' )

18	public class PeopleRestService {

19	@Inject private PeopleService peopleService;

20

21	@Produces( { 'application/json' } )

22

@GET

23	public Collection< Person > getPeople( @QueryParam( 'page') @DefaultValue( '1' ) final int page ) {

24	return peopleService.getPeople( page, 5 );

25

}

26

27	@Produces( { 'application/json' } )

28

@PUT

29	public Person addPerson( @FormParam( 'email' ) final String email ) {

30	return peopleService.addPerson( email );

31

}

32

}

Though simple, this class needs more explanations. First of all, we want to expose our RESTful service to /people endpoint. Combining it with /api (where our JAX-RS application resides), it gives as the /api/people as qualified path.

Now, whenever someone issues HTTP GET to this path, the method getPeople should be invoked. This method accepts optional parameter page (with default value 1) and returns list of persons as JSON. In turn, if someone issues HTTP PUT to the same path, the method addPerson should be invoked (with required parameter email) and return new person as a JSON.

Now let’s take a look on Spring configuration, the core of our application.

view sourceprint?

01	package com.example.config;

02

03	import java.util.Arrays;

04

05	import javax.ws.rs.ext.RuntimeDelegate;

06

07	import org.apache.cxf.bus.spring.SpringBus;

08	import org.apache.cxf.endpoint.Server;

09	import org.apache.cxf.jaxrs.JAXRSServerFactoryBean;

10	import org.codehaus.jackson.jaxrs.JacksonJsonProvider;

11	import org.springframework.context.annotation.Bean;

12	import org.springframework.context.annotation.Configuration;

13

14	import com.example.rs.JaxRsApiApplication;

15	import com.example.rs.PeopleRestService;

16	import com.example.services.PeopleService;

17

18	@Configuration

19	public class AppConfig {

20	@Bean( destroyMethod = 'shutdown' )

21	public SpringBus cxf() {

22	return new SpringBus();

23

}

24

25

@Bean

26	public Server jaxRsServer() {

27	JAXRSServerFactoryBean factory = RuntimeDelegate.getInstance().createEndpoint( jaxRsApiApplication(), JAXRSServerFactoryBean.class );

28	factory.setServiceBeans( Arrays.< Object >asList( peopleRestService() ) );

29	factory.setAddress( '/' + factory.getAddress() );

30	factory.setProviders( Arrays.< Object >asList( jsonProvider() ) );

31	return factory.create();

32

}

33

34

@Bean

35	public JaxRsApiApplication jaxRsApiApplication() {

36	return new JaxRsApiApplication();

37

}

38

39

@Bean

40	public PeopleRestService peopleRestService() {

41	return new PeopleRestService();

42

}

43

44

@Bean

45	public PeopleService peopleService() {

46	return new PeopleService();

47

}

48

49

@Bean

50	public JacksonJsonProvider jsonProvider() {

51	return new JacksonJsonProvider();

52

}

53

}

It doesn’t look complicated but a lot happens under the hood. Let’s dissect it into the peices. The two key component here are the factory JAXRSServerFactoryBean which does all heavy lifting for configuring our instance of JAX-RS server, and SpringBus instance which seamlessly glues Spring and Apache CXF together. All other components represent regular Spring beans.

What’s not on a picture yet is embedding Jetty web server instance. Our main application class Starter does exactly that.

view sourceprint?

01	package com.example;

02

03	import org.apache.cxf.transport.servlet.CXFServlet;

04	import org.eclipse.jetty.server.Server;

05	import org.eclipse.jetty.servlet.ServletContextHandler;

06	import org.eclipse.jetty.servlet.ServletHolder;

07	import org.springframework.web.context.ContextLoaderListener;

08	import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;

09

10	import com.example.config.AppConfig;

11

12	public class Starter {

13	public static void main( final String[] args ) throws Exception {

14	Server server = new Server( 8080 );

15

16	// Register and map the dispatcher servlet

17	final ServletHolder servletHolder = new ServletHolder( new CXFServlet() );

18	final ServletContextHandler context = new ServletContextHandler();

19	context.setContextPath( '/' );

20	context.addServlet( servletHolder, '/rest/*' );

21	context.addEventListener( new ContextLoaderListener() );

22

23	context.setInitParameter( 'contextClass', AnnotationConfigWebApplicationContext.class.getName() );

24	context.setInitParameter( 'contextConfigLocation', AppConfig.class.getName() );

25

26	server.setHandler( context );

27	server.start();

28	server.join();

29

}

30

}

Looking through this code uncovers that we are running Jetty server instance on port 8080, we are configuring Apache CXF servlet to handle all request at /rest/* path (which together with our JAX-RS application and service gives us the /rest/api/people), we are adding Spring context listener parametrized with the configuration we have defined above and finally we are starting server up. What we have at this point is full-blown web server hosting our JAX-RS services. Let’s see it in action. Firstly, let’s package it as single, runnable and redistributable fat or one jar:

view sourceprint?

1	mvn clean package

Let’s pick up the bits from the target folder and run them:

view sourceprint?

1	java -jar target/spring-one-jar-0.0.1-SNAPSHOT.one-jar.jar

And we should see the output like that:

view sourceprint?

01	2013-01-19 11:43:08.636:INFO:oejs.Server:jetty-8.1.8.v20121106

02	2013-01-19 11:43:08.698:INFO:/:Initializing Spring root WebApplicationContext

03	Jan 19, 2013 11:43:08 AM org.springframework.web.context.ContextLoader initWebApplicationContext

04	INFO: Root WebApplicationContext: initialization started

05	Jan 19, 2013 11:43:08 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh

06	INFO: Refreshing Root WebApplicationContext: startup date [Sat Jan 19 11:43:08 EST 2013]; root of context hierarchy

07	Jan 19, 2013 11:43:08 AM org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider registerDefaultFilters

08	INFO: JSR-330 'javax.inject.Named' annotation found and supported for component scanning

09	Jan 19, 2013 11:43:08 AM org.springframework.web.context.support.AnnotationConfigWebApplicationContext loadBeanDefinitions

10	INFO: Successfully resolved class for [com.example.config.AppConfig]

11	Jan 19, 2013 11:43:09 AM org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor

12	INFO: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring

13	Jan 19, 2013 11:43:09 AM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons

14	INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1f8166e5:

15	defining beans [org.springframework.context.annotation.internal

16	ConfigurationAnnotationProcessor,

17	org.springframework.context.annotation.internalAutowiredAnnotationProcessor,

18	org.springframework.context.annotation.internalRequiredAnnotationProces

19	sor,org.springframework.context.annotation.internalCommonAnnotationProcessor,appConfig,

20	org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,c

21	xf,jaxRsServer,jaxRsApiApplication,peopleRestService,peopleService,jsonProvider]; root of factory hierarchy

22	Jan 19, 2013 11:43:10 AM org.apache.cxf.endpoint.ServerImpl initDestination

23	INFO: Setting the server's publish address to be /api

24	Jan 19, 2013 11:43:10 AM org.springframework.web.context.ContextLoader initWebApplicationContext

25	INFO: Root WebApplicationContext: initialization completed in 2227 ms

26	2013-01-19 11:43:10.957:INFO:oejsh.ContextHandler:started o.e.j.s.ServletContextHandler{/,null}

27	2013-01-19 11:43:11.019:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080

Having our server up and running, let’s issue some HTTP requests to it so to be sure everything works just as we expected:

view sourceprint?

01	> curl http://localhost:8080/rest/api/people?page=2

02

[

03	{'email':'[email protected]','firstName':null,'lastName':null},

04	{'email':'[email protected]','firstName':null,'lastName':null},

05	{'email':'[email protected]','firstName':null,'lastName':null},

06	{'email':'[email protected]','firstName':null,'lastName':null},

07	{'email':'[email protected]','firstName':null,'lastName':null}

08

]

09

10	> curl http://localhost:8080/rest/api/people -X PUT -d '[email protected]'

11	{'email':'[email protected]','firstName':null,'lastName':null}

Awesome! And please notice, we are completely XML-free! Source code: https://github.com/reta/spring-one-jar/tree/jetty-embedded

Before ending the post, I would like to mention one great project, Dropwizard, which uses quite similar concepts but pushes it to the level of excellent, well-designed framework, thanks to Yammer guys for that.
 

Reference: Going REST: embedding Jetty with Spring and JAX-RS (Apache CXF) from our JCG partner Andrey Redko at the Andriy Redko {devmind} blog.