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Ehcache With CXF Web Service

By admin | April 22, 2012 | Updated : March 26, 2016 cxf, ehcache, rest, webservice, 1 Comments
Ehcache With CXF Web Service

Ehcache With CXF Web Service explains about the step by step details of Creating / Developing restful services using Apache CXF, Eclipse and Ehcache

Apache CXF is a free and open source project, and a fully featured Webservice framework. It helps you building webservices using different front-end API's, like as JAX-RS and JAX-WS.

Ehcache is a famous open source caching implementation available in java, By using caching technique, we can reduce the method invocation and reduce the response time dramatically. Ehcache consists with more functionalities as compared to spring cache

You can see the below example, which is demonstrate Ehcache With CXF Web Service

Note

You can also read article about Spring Cache With CXF Web Service

Required Libraries

You need to download

  1. JDK 7
  2. Eclipse 4.2
  3. CXF-2.7.3
  4. Tomcat 7

Following jar must be in classpath (You need to download spring 3.1 or higher separately)

  1. aopalliance-1.0.jar
  2. commons-logging-1.1.1.jar
  3. cxf-2.7.3.jar
  4. httpasyncclient-4.0-beta3.jar
  5. httpclient-4.2.1.jar
  6. httpcore-4.2.2.jar
  7. httpcore-nio-4.2.2.jar
  8. neethi-3.0.2.jar
  9. org.springframework.aop-3.1.1.RELEASE.jar
  10. org.springframework.asm-3.1.1.RELEASE.jar
  11. org.springframework.beans-3.1.1.RELEASE.jar
  12. org.springframework.context-3.1.1.RELEASE.jar
  13. org.springframework.core-3.1.1.RELEASE.jar
  14. org.springframework.expression-3.1.1.RELEASE.jar
  15. org.springframework.web-3.1.1.RELEASE.jar
  16. wsdl4j-1.6.2.jar
  17. jaxb-impl-2.2.6.jar
  18. javax.ws.rs-api-2.0-m10.jar
  19. slf4j-api-1.6.2.jar
  20. jettison-1.3.3.jar (JSON library)
  21. ehcache-core-2.5.1.jar
  22. cglib-nodep-2.1_3.jar

Ehcache With CXF Web Service

I am creating a sample restful service project that pass Student object and return with some changes on that object. The service is using simple POJO (Plain Old Java Object) bean.

Firstly create a Dynamic Web Project (File->New->Dynamic Web Project) named "CXFRestfulTutorial" according to following screenshot

Create CXF Project Ehcache With CXF Web Service

Create a Student Object

package com.student;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "Student")
public class Student {
  private String name;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

}

Create a Service Interface

This service interface will defines which methods of restful service, to be invoked by the client

Here we implement the service interface created on the previous step

Note

Here we are using @Cacheable annotation like below

@Cacheable(value="student", key="#student.name")

value="student" is the cache name specified in cxf.xml

student.name is the property available on Student object, it will be the key

package com.student;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

import org.springframework.cache.annotation.Cacheable;

@Consumes("application/json")
@Produces("application/json")
public class ChangeStudentDetailsImpl{
  @Cacheable(value="student", key="#student.name")
  @POST
  @Path("/changeName")
  public Student changeName(Student student) {
    System.out.println("Inside changeName method");
    student.setName("HELLO " + student.getName());
    return student;
  }
}

Create a cxf.xml

You need to add

<cache:annotation-driven />

for working on annotations and also need to specify which cacheManager we are using

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:cache="http://www.springframework.org/schema/cache" xmlns:cxf="http://cxf.apache.org/core"
	xmlns:jaxrs="http://cxf.apache.org/jaxrs" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://cxf.apache.org/core http://cxf.apache.org/schemas/core.xsd  
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
	<import resource="classpath:META-INF/cxf/cxf.xml" />
	<cache:annotation-driven />
	<cxf:bus>
		<cxf:features>
			<cxf:logging />
		</cxf:features>
	</cxf:bus>
	<jaxrs:server address="/rest" id="base">
		<jaxrs:serviceBeans>
			<ref bean="StudentService" />
		</jaxrs:serviceBeans>
	</jaxrs:server>
	<bean class="com.student.ChangeStudentDetailsImpl" id="StudentService" />
	<!-- Ehcache library setup -->
	<bean class="org.springframework.cache.ehcache.EhCacheCacheManager"
		id="cacheManager" p:cache-manager-ref="ehcache" />
	<bean class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean"
		id="ehcache" p:config-location="WEB-INF/ehcache.xml" />
</beans>

Create a ehcache.xml

We are spacifying cache configurations on ehcache.xml

<ehcache>
	<diskStore path="java.io.tmpdir" />
	<cache name="student" maxElementsInMemory="100" eternal="false"
		timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true"
		maxElementsOnDisk="10000000" diskPersistent="false"
		diskExpiryThreadIntervalSeconds="120" memoryStoreEvictionPolicy="LRU" />
</ehcache>

Change web.xml

Change the web.xml file to find CXF servlet and cxf.xml

<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemalocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>WEB-INF/cxf.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <servlet>
    <servlet-name>CXFServlet</servlet-name>
    <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>CXFServlet</servlet-name>
    <url-pattern>/*</url-pattern>
  </servlet-mapping>
</web-app>

Publishing CXF Restful Service

Run CXF Restful On Tomcat

Deployed CXF Restful Service

CXF Restful Service Running

Now just call "CXF Restful Client" in order to run this restful service

Need to change the code like following on client

URL url = new URL("http://localhost:8080/CXFRestfulTutorial/rest/changeName");

Here I am calling the client twice and showing the result below, From the result you can see that "Inside changeName method" is showing only once, this is because when first request is coming from client response is cached after that Student object is returned from the cache

Output
Aug 29, 2012 3:56:47 AM org.apache.cxf.interceptor.LoggingInInterceptor
INFO: Inbound Message
----------------------------
ID: 2
Address: http://localhost:8080/CXFRestfulTutorial/rest/changeName
Encoding: ISO-8859-1
Http-Method: POST
Content-Type: application/json
Headers: {Accept=[text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2], connection=[keep-alive], Content-Length=[26], content-type=[application/json], host=[localhost:8080], user-agent=[Java/1.7.0_03]}
Payload: {"Student":{"name":"Tom"}}
--------------------------------------
Inside changeName method
Aug 29, 2012 3:56:50 AM org.apache.cxf.interceptor.LoggingOutInterceptor
INFO: Outbound Message
---------------------------
ID: 2
Response-Code: 200
Content-Type: application/json
Headers: {Date=[Tue, 28 Aug 2012 22:26:50 GMT]}
Payload: {"Student":{"name":"HELLO Tom"}}
--------------------------------------

Aug 29, 2012 4:05:19 AM org.apache.cxf.interceptor.LoggingInInterceptor
INFO: Inbound Message
----------------------------
ID: 3
Address: http://localhost:8080/CXFRestfulTutorial/rest/changeName
Encoding: ISO-8859-1
Http-Method: POST
Content-Type: application/json
Headers: {Accept=[text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2], connection=[keep-alive], Content-Length=[26], content-type=[application/json], host=[localhost:8080], user-agent=[Java/1.7.0_03]}
Payload: {"Student":{"name":"Tom"}}
--------------------------------------
Aug 29, 2012 4:05:24 AM org.apache.cxf.interceptor.LoggingOutInterceptor
INFO: Outbound Message
---------------------------
ID: 3
Response-Code: 200
Content-Type: application/json
Headers: {Date=[Tue, 28 Aug 2012 22:35:22 GMT]}
Payload: {"Student":{"name":"HELLO Tom"}}
--------------------------------------

 





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1 Responses to "Ehcache With CXF Web Service"
  1. Jeevan 2012-04-25 09:48:04.0 
    Hi,

Great article. Exactly something I was looking for.

Following your article, I have exposed ehCache as a RESTFul web-service using Apache CXF.

Request a small help ... (and please excuse me as it maybe slightly off the topic for this article, but will appreciate a couple of pointers)

My problem:
1. I wish to store items in the cache, but along with key & data, I wish to specify a maxAge (in hours/ minutes or seconds) parameter;
The data should be stored in ehCache only till the maxAge defined and evicted immediately after.

Any ideas/ pointers?

TIA !!
Jeevan

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