{"id":1407,"date":"2012-06-12T01:00:00","date_gmt":"2012-06-12T01:00:00","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/2012\/10\/resteasy-tutorial-part-2-spring-integration.html"},"modified":"2014-02-26T17:16:39","modified_gmt":"2014-02-26T15:16:39","slug":"resteasy-tutorial-part-2-spring","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2012\/06\/resteasy-tutorial-part-2-spring.html","title":{"rendered":"RESTEasy Tutorial Part-2: Spring Integration"},"content":{"rendered":"<div dir=\"ltr\" style=\"text-align: left\">RESTEasy provides support for Spring integration which enables us to expose Spring beans as RESTful WebServices.<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n<strong>Step#1: Configure RESTEasy+Spring dependencies using Maven.<\/strong><\/p>\n<pre class=\"brush:java\"> &lt;project xmlns='http:maven.apache.orgPOM4.0.0' \r\n   xmlns:xsi='http:www.w3.org2001XMLSchema-instance'\r\n   xsi:schemaLocation='http:maven.apache.orgPOM4.0.0 \r\n   http:maven.apache.orgmaven-v4_0_0.xsd'&gt;\r\n   &lt;modelVersion&gt;4.0.0&lt;modelVersion&gt;\r\n  \r\n   &lt;groupId&gt;com.sivalabs&lt;groupId&gt;\r\n   &lt;artifactId&gt;resteasy-demo&lt;artifactId&gt;\r\n   &lt;version&gt;0.1&lt;version&gt;\r\n   &lt;packaging&gt;war&lt;packaging&gt;\r\n   \r\n   &lt;properties&gt;\r\n    &lt;project.build.sourceEncoding&gt;UTF-8&lt;project.build.sourceEncoding&gt;\r\n  &lt;org.springframework.version&gt;3.1.0.RELEASE&lt;org.springframework.version&gt;\r\n  &lt;slf4j.version&gt;1.6.1&lt;slf4j.version&gt;\r\n  &lt;java.version&gt;1.6&lt;java.version&gt;\r\n  &lt;junit.version&gt;4.8.2&lt;junit.version&gt;\r\n  &lt;resteasy.version&gt;2.3.2.Final&lt;resteasy.version&gt;\r\n   &lt;properties&gt;\r\n   \r\n   &lt;build&gt;\r\n     &lt;finalName&gt;resteasy-demo&lt;finalName&gt;\r\n   &lt;build&gt;\r\n   \r\n   &lt;dependencies&gt;\r\n     &lt;dependency&gt;\r\n       &lt;groupId&gt;junit&lt;groupId&gt;\r\n       &lt;artifactId&gt;junit&lt;artifactId&gt;\r\n       &lt;scope&gt;test&lt;scope&gt;\r\n     &lt;dependency&gt;\r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;org.slf4j&lt;groupId&gt;\r\n   &lt;artifactId&gt;slf4j-api&lt;artifactId&gt;\r\n   &lt;version&gt;${slf4j.version}&lt;version&gt;\r\n  &lt;dependency&gt;\r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;org.slf4j&lt;groupId&gt;\r\n   &lt;artifactId&gt;jcl-over-slf4j&lt;artifactId&gt;\r\n   &lt;version&gt;${slf4j.version}&lt;version&gt;\r\n   &lt;scope&gt;runtime&lt;scope&gt;\r\n  &lt;dependency&gt;\r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;org.slf4j&lt;groupId&gt;\r\n   &lt;artifactId&gt;slf4j-log4j12&lt;artifactId&gt;\r\n   &lt;version&gt;${slf4j.version}&lt;version&gt;\r\n   &lt;scope&gt;runtime&lt;scope&gt;\r\n  &lt;dependency&gt;\r\n \r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;log4j&lt;groupId&gt;\r\n   &lt;artifactId&gt;log4j&lt;artifactId&gt;\r\n   &lt;version&gt;1.2.16&lt;version&gt;\r\n   &lt;scope&gt;runtime&lt;scope&gt;\r\n  &lt;dependency&gt;\r\n \r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;org.springframework&lt;groupId&gt;\r\n   &lt;artifactId&gt;spring-context-support&lt;artifactId&gt;\r\n   &lt;version&gt;${org.springframework.version}&lt;version&gt;\r\n   &lt;exclusions&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;commons-logging&lt;artifactId&gt;\r\n     &lt;groupId&gt;commons-logging&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n   &lt;exclusions&gt;\r\n  &lt;dependency&gt;\r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;org.springframework&lt;groupId&gt;\r\n   &lt;artifactId&gt;spring-web&lt;artifactId&gt;\r\n   &lt;version&gt;${org.springframework.version}&lt;version&gt;\r\n  &lt;dependency&gt;\r\n \r\n     &lt;dependency&gt;\r\n      &lt;groupId&gt;org.jboss.resteasy&lt;groupId&gt;\r\n      &lt;artifactId&gt;resteasy-jaxrs&lt;artifactId&gt;\r\n   &lt;version&gt;${resteasy.version}&lt;version&gt;\r\n      &lt;scope&gt;provided&lt;scope&gt;\r\n     &lt;dependency&gt;\r\n     &lt;dependency&gt;\r\n      &lt;groupId&gt;org.jboss.resteasy&lt;groupId&gt;\r\n      &lt;artifactId&gt;resteasy-jaxb-provider&lt;artifactId&gt;\r\n   &lt;version&gt;${resteasy.version}&lt;version&gt;\r\n      &lt;scope&gt;provided&lt;scope&gt;\r\n     &lt;dependency&gt;\r\n \r\n     &lt;dependency&gt;\r\n      &lt;groupId&gt;org.jboss.resteasy&lt;groupId&gt;\r\n      &lt;artifactId&gt;jaxrs-api&lt;artifactId&gt;\r\n      &lt;version&gt;2.3.0.GA&lt;version&gt;\r\n      &lt;scope&gt;provided&lt;scope&gt;\r\n     &lt;dependency&gt;\r\n        \r\n  &lt;dependency&gt;\r\n   &lt;groupId&gt;org.jboss.resteasy&lt;groupId&gt;\r\n   &lt;artifactId&gt;resteasy-spring&lt;artifactId&gt;\r\n   &lt;version&gt;2.3.0.GA&lt;version&gt;\r\n   &lt;exclusions&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;commons-logging&lt;artifactId&gt;\r\n     &lt;groupId&gt;commons-logging&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;org.jboss.resteasy&lt;artifactId&gt;\r\n     &lt;groupId&gt;resteasy-jaxb-provider&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;jaxb-impl&lt;artifactId&gt;\r\n     &lt;groupId&gt;com.sun.xml.bind&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;sjsxp&lt;artifactId&gt;\r\n     &lt;groupId&gt;com.sun.xml.stream&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;jsr250-api&lt;artifactId&gt;\r\n     &lt;groupId&gt;javax.annotation&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;resteasy-jaxb-provider&lt;artifactId&gt;\r\n     &lt;groupId&gt;org.jboss.resteasy&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n    &lt;exclusion&gt;\r\n     &lt;artifactId&gt;activation&lt;artifactId&gt;\r\n     &lt;groupId&gt;javax.activation&lt;groupId&gt;\r\n    &lt;exclusion&gt;\r\n   &lt;exclusions&gt;\r\n  &lt;dependency&gt;\r\n  &lt;dependency&gt;\r\n    &lt;groupId&gt;javax.servlet&lt;groupId&gt;\r\n    &lt;artifactId&gt;servlet-api&lt;artifactId&gt;\r\n    &lt;version&gt;2.5&lt;version&gt;\r\n    &lt;scope&gt;provided&lt;scope&gt;\r\n   &lt;dependency&gt;\r\n     &lt;dependency&gt;\r\n         &lt;groupId&gt;org.apache.httpcomponents&lt;groupId&gt;\r\n         &lt;artifactId&gt;httpclient&lt;artifactId&gt;\r\n   &lt;version&gt;4.1.2&lt;version&gt;\r\n     &lt;dependency&gt;\r\n        \r\n   &lt;dependencies&gt;\r\n   \r\n &lt;project&gt;<\/pre>\n<p><strong>Step#2: Configure RESTEasy+Spring in web.xml<\/strong><div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\"brush:java\"> &lt;web-app xmlns:xsi='http:www.w3.org2001XMLSchema-instance' \r\n   xmlns='http:java.sun.comxmlnsjavaee' \r\n   xmlns:web='http:java.sun.comxmlnsjavaeeweb-app_2_5.xsd' \r\n   xsi:schemaLocation='http:java.sun.comxmlnsjavaee \r\n   http:java.sun.comxmlnsjavaeeweb-app_3_0.xsd' \r\n   id='WebApp_ID' version='3.0'&gt;\r\n \r\n    &lt;listener&gt;\r\n     &lt;listener-class&gt;org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap&lt;listener-class&gt;\r\n   &lt;listener&gt;\r\n   &lt;listener&gt;\r\n     &lt;listener-class&gt;org.jboss.resteasy.plugins.spring.SpringContextLoaderListener&lt;listener-class&gt;\r\n   &lt;listener&gt;\r\n   &lt;servlet&gt;\r\n     &lt;servlet-name&gt;Resteasy&lt;servlet-name&gt;\r\n     &lt;servlet-class&gt;org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher&lt;servlet-class&gt;\r\n   &lt;servlet&gt;\r\n   &lt;servlet-mapping&gt;\r\n     &lt;servlet-name&gt;Resteasy&lt;servlet-name&gt;\r\n     &lt;url-pattern&gt;rest*&lt;url-pattern&gt;\r\n   &lt;servlet-mapping&gt;\r\n   &lt;context-param&gt;\r\n     &lt;param-name&gt;contextConfigLocation&lt;param-name&gt;\r\n     &lt;param-value&gt;classpath:applicationContext.xml&lt;param-value&gt;\r\n   &lt;context-param&gt;\r\n   &lt;context-param&gt;\r\n     &lt;param-name&gt;resteasy.servlet.mapping.prefix&lt;param-name&gt;\r\n     &lt;param-value&gt;rest&lt;param-value&gt;\r\n   &lt;context-param&gt;\r\n   &lt;context-param&gt;\r\n         &lt;param-name&gt;resteasy.scan&lt;param-name&gt;\r\n         &lt;param-value&gt;true&lt;param-value&gt;\r\n     &lt;context-param&gt;\r\n &lt;web-app&gt;<\/pre>\n<p><strong>Step#3: Create a Spring Service class UserService and update UserResource to use UserService bean.<\/strong><\/p>\n<pre class=\"brush:java\"> package com.sivalabs.resteasydemo;\r\n \r\n import java.util.List;\r\n import org.springframework.stereotype.Service;\r\n import com.sivalabs.resteasydemo.MockUserTable;\r\n \r\n @Service\r\n public class UserService \r\n {\r\n \r\n  public void save(User user){\r\n   MockUserTable.save(user);\r\n  }\r\n \r\n  public User getById(Integer id){\r\n   return MockUserTable.getById(id);\r\n  }\r\n \r\n  public List&lt;User&gt; getAll(){\r\n   return MockUserTable.getAll();\r\n  }\r\n  public void delete(Integer id){\r\n   MockUserTable.delete(id);\r\n  }\r\n }\r\n \r\n \r\n package com.sivalabs.resteasydemo;\r\n \r\n import java.util.List;\r\n \r\n import javax.ws.rs.Consumes;\r\n import javax.ws.rs.DELETE;\r\n import javax.ws.rs.GET;\r\n import javax.ws.rs.POST;\r\n import javax.ws.rs.Path;\r\n import javax.ws.rs.PathParam;\r\n import javax.ws.rs.Produces;\r\n import javax.ws.rs.core.GenericEntity;\r\n import javax.ws.rs.core.MediaType;\r\n import javax.ws.rs.core.Response;\r\n \r\n import org.springframework.beans.factory.annotation.Autowired;\r\n import org.springframework.stereotype.Component;\r\n \r\n @Component\r\n @Path('users')\r\n @Produces(MediaType.APPLICATION_XML)\r\n @Consumes(MediaType.APPLICATION_XML)\r\n public class UserResource \r\n {\r\n  @Autowired\r\n  private UserService userService;\r\n \r\n  @Path('')\r\n  @GET\r\n  public Response getUsersXML() \r\n  {\r\n   List&lt;User&gt; users = userService.getAll();\r\n   GenericEntity&lt;List&lt;User&gt;&gt; ge = new GenericEntity&lt;List&lt;User&gt;&gt;(users){};\r\n   return Response.ok(ge).build();\r\n  }\r\n \r\n  @Path('{id}')\r\n  @GET\r\n  public Response getUserXMLById(@PathParam('id') Integer id) {\r\n   User user = userService.getById(id);\r\n   return Response.ok(user).build();\r\n  }\r\n \r\n  @Path('')\r\n  @POST\r\n  public Response saveUser(User user) {\r\n   userService.save(user);\r\n   return Response.ok('&lt;status&gt;success&lt;status&gt;').build();\r\n  }\r\n \r\n  @Path('{id}')\r\n  @DELETE\r\n  public Response deleteUser(@PathParam('id') Integer id) {\r\n   userService.delete(id);\r\n   return Response.ok('&lt;status&gt;success&lt;status&gt;').build();\r\n  }\r\n \r\n }\r\n          \r\npackage com.sivalabs.resteasydemo;\r\n \r\n import java.util.List;\r\n import org.springframework.stereotype.Service;\r\n import com.sivalabs.resteasydemo.MockUserTable;\r\n \r\n @Service\r\n public class UserService \r\n {\r\n \r\n  public void save(User user){\r\n   MockUserTable.save(user);\r\n  }\r\n \r\n  public User getById(Integer id){\r\n   return MockUserTable.getById(id);\r\n  }\r\n \r\n  public List&lt;User&gt; getAll(){\r\n   return MockUserTable.getAll();\r\n  }\r\n  public void delete(Integer id){\r\n   MockUserTable.delete(id);\r\n  }\r\n }\r\n \r\n \r\n package com.sivalabs.resteasydemo;\r\n \r\n import java.util.List;\r\n \r\n import javax.ws.rs.Consumes;\r\n import javax.ws.rs.DELETE;\r\n import javax.ws.rs.GET;\r\n import javax.ws.rs.POST;\r\n import javax.ws.rs.Path;\r\n import javax.ws.rs.PathParam;\r\n import javax.ws.rs.Produces;\r\n import javax.ws.rs.core.GenericEntity;\r\n import javax.ws.rs.core.MediaType;\r\n import javax.ws.rs.core.Response;\r\n \r\n import org.springframework.beans.factory.annotation.Autowired;\r\n import org.springframework.stereotype.Component;\r\n \r\n @Component\r\n @Path('users')\r\n @Produces(MediaType.APPLICATION_XML)\r\n @Consumes(MediaType.APPLICATION_XML)\r\n public class UserResource \r\n {\r\n  @Autowired\r\n  private UserService userService;\r\n \r\n  @Path('')\r\n  @GET\r\n  public Response getUsersXML() \r\n  {\r\n   List&lt;User&gt; users = userService.getAll();\r\n   GenericEntity&lt;List&lt;User&gt;&gt; ge = new GenericEntity&lt;List&lt;User&gt;&gt;(users){};\r\n   return Response.ok(ge).build();\r\n  }\r\n \r\n  @Path('{id}')\r\n  @GET\r\n  public Response getUserXMLById(@PathParam('id') Integer id) {\r\n   User user = userService.getById(id);\r\n   return Response.ok(user).build();\r\n  }\r\n \r\n  @Path('')\r\n  @POST\r\n  public Response saveUser(User user) {\r\n   userService.save(user);\r\n   return Response.ok('&lt;status&gt;success&lt;status&gt;').build();\r\n  }\r\n \r\n  @Path('{id}')\r\n  @DELETE\r\n  public Response deleteUser(@PathParam('id') Integer id) {\r\n   userService.delete(id);\r\n   return Response.ok('&lt;status&gt;success&lt;status&gt;').build();\r\n  }\r\n \r\n }\r\n applicationContext.xml\r\n &lt;?xml version='1.0' encoding='UTF-8'?&gt;\r\n &lt;beans xmlns='http:www.springframework.orgschemabeans'\r\n  xmlns:xsi='http:www.w3.org2001XMLSchema-instance'\r\n  xmlns:p='http:www.springframework.orgschemap'\r\n  xmlns:context='http:www.springframework.orgschemacontext'\r\n  xsi:schemaLocation='http:www.springframework.orgschemabeans \r\n  http:www.springframework.orgschemabeansspring-beans.xsd\r\n  http:www.springframework.orgschemacontext \r\n  http:www.springframework.orgschemacontextspring-context.xsd'&gt;\r\n \r\n  &lt;context:annotation-config&gt;\r\n \r\n  &lt;context:component-scan base-package='com.sivalabs.resteasydemo'&gt;\r\n \r\n &lt;beans&gt;<\/pre>\n<p><strong>Step#4: Same JUnit TestCase to test the REST Webservice described in Part-1.<\/strong><\/p>\n<pre class=\"brush:java\"> package com.sivalabs.resteasydemo;\r\n \r\n import java.util.List;\r\n \r\n import org.jboss.resteasy.client.ClientRequest;\r\n import org.jboss.resteasy.client.ClientResponse;\r\n import org.jboss.resteasy.util.GenericType;\r\n import org.junit.Assert;\r\n import org.junit.Test;\r\n \r\n import com.sivalabs.resteasydemo.User;\r\n \r\n public class UserResourceTest {\r\n \r\n  static final String ROOT_URL = 'http:localhost:8080resteasy-demorest';\r\n \r\n  @Test\r\n  public void testGetUsers() throws Exception \r\n  {\r\n   ClientRequest request = new ClientRequest(ROOT_URL+'users');\r\n   ClientResponse&lt;List&lt;User&gt;&gt; response = request.get(new GenericType&lt;List&lt;User&gt;&gt;(){});\r\n   List&lt;User&gt; users = response.getEntity();\r\n   Assert.assertNotNull(users);\r\n  }\r\n \r\n  @Test\r\n  public void testGetUserById() throws Exception \r\n  {\r\n   ClientRequest request = new ClientRequest(ROOT_URL+'users1');\r\n   ClientResponse&lt;User&gt; response = request.get(User.class);\r\n   User user = response.getEntity();\r\n   Assert.assertNotNull(user);\r\n  }\r\n \r\n  @Test\r\n  public void testSaveUser() throws Exception \r\n  {\r\n   User user = new User();\r\n   user.setId(3);\r\n   user.setName('User3');\r\n   user.setEmail('user3@gmail.com');\r\n \r\n   ClientRequest request = new ClientRequest(ROOT_URL+'users');\r\n   request.body('applicationxml', user);\r\n   ClientResponse&lt;String&gt; response = request.post(String.class);\r\n \r\n   String statusXML = response.getEntity();\r\n   Assert.assertNotNull(statusXML);\r\n  }\r\n \r\n  @Test\r\n  public void testDeleteUser() throws Exception \r\n  {\r\n   ClientRequest request = new ClientRequest(ROOT_URL+'users2');\r\n   ClientResponse&lt;String&gt; response = request.delete(String.class);\r\n   String statusXML = response.getEntity();\r\n   Assert.assertNotNull(statusXML);\r\n  }\r\n }\r\n<\/pre>\n<p><strong>Important Things to Keep in mind:<\/strong><\/p>\n<p>1. org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap Listener should be registered before any other listener.<br \/>\n2. You should configure resteasy.servlet.mapping.prefix @lt;context-param&gt; if the HttpServletDispatcher servlet url-pattern is anything other than \/*<br \/>\n3. You should register REST Resource as Spring bean by annotating with @Component or @Service.                                                                                     <\/p>\n<p><strong><i>Reference: <\/i><\/strong><a href=\"http:\/\/www.sivalabs.in\/2012\/06\/resteasy-tutorial-part-2-spring.html\">RESTEasy Tutorial Part-2: Spring Integration<\/a> from our <a href=\"http:\/\/www.javacodegeeks.com\/p\/jcg.html\">JCG partner<\/a> Siva Reddy at the <a href=\"http:\/\/www.sivalabs.in\/\">My Experiments on Technology<\/a> blog.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>RESTEasy provides support for Spring integration which enables us to expose Spring beans as RESTful WebServices. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Step#1: Configure RESTEasy+Spring dependencies using Maven. &lt;project xmlns=&#8217;http:maven.apache.orgPOM4.0.0&#8242; xmlns:xsi=&#8217;http:www.w3.org2001XMLSchema-instance&#8217; xsi:schemaLocation=&#8217;http:maven.apache.orgPOM4.0.0 http:maven.apache.orgmaven-v4_0_0.xsd&#8217;&gt; &lt;modelVersion&gt;4.0.0&lt;modelVersion&gt; &lt;groupId&gt;com.sivalabs&lt;groupId&gt; &lt;artifactId&gt;resteasy-demo&lt;artifactId&gt; &lt;version&gt;0.1&lt;version&gt; &lt;packaging&gt;war&lt;packaging&gt; &lt;properties&gt; &lt;project.build.sourceEncoding&gt;UTF-8&lt;project.build.sourceEncoding&gt; &lt;org.springframework.version&gt;3.1.0.RELEASE&lt;org.springframework.version&gt; &lt;slf4j.version&gt;1.6.1&lt;slf4j.version&gt; &lt;java.version&gt;1.6&lt;java.version&gt; &lt;junit.version&gt;4.8.2&lt;junit.version&gt; &lt;resteasy.version&gt;2.3.2.Final&lt;resteasy.version&gt; &lt;properties&gt; &lt;build&gt; &lt;finalName&gt;resteasy-demo&lt;finalName&gt; &lt;build&gt; &lt;dependencies&gt; &lt;dependency&gt; &hellip;<\/p>\n","protected":false},"author":15,"featured_media":160,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[135,54,30],"class_list":["post-1407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-jboss-resteasy","tag-restful-web-services","tag-spring"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>RESTEasy Tutorial Part-2: Spring Integration - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"RESTEasy provides support for Spring integration which enables us to expose Spring beans as RESTful WebServices. &nbsp; 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