Apache Camel + Rest Webservice using CXFRS Hello World Example

In this post we will expose a REST Webservice using Apache Camel and CXFRS. In a previous post we had implemented REST Webservice using Apache Camel and JAX-RS CXFRS is indeed just one of them but as you can guess from its name it is dedicated to supporting HTTP endpoints and clients written on top of Apache CXF JAX-RS implementation.
Using JAX-RS we can configure the server to expose a REST serverice which returns an output by directly calling the specified resource class. If we have to use the camel route for returning the response then we make use of CXF-RS.

Apache Camel - Table of Contents
File Transfer Using Java DSL Apache Camel
Apache Camel Java DSL + Spring Integration Hello World Example
Apache Camel Exception Handling Using Simple Example
Apache Camel Redelivery policy using example
Integrate Apache Camel and ActiveMQ
EIP patterns using Apache Camel
Apache Camel Tutorial- Integrate Spring Boot+ Apache Camel
Apache Camel Tutorial- Integrate with MySQL DB using SQL query
Apache Camel EIP - Splitter and Aggregator pattern
Apache Camel Unit Testing 
Apache Camel + Spring + Quartz Hello World Example 
Camel application deployment on JBoss Fuse 
Apache Camel + Apache CXF SOAP Webservices 
Apache Camel + JAX-RS REST Webservice
Apache Camel + CXFRS REST Webservice 
Apache Camel Routing Slip EIP Pattern
Apache Camel Dynamic Router Pattern
Apache Camel Load Balancer EIP Pattern
Apache Camel Interceptors
Apache Camel + Kafka Hello World Example
Apache Camel - Marshalling/Unmarshalling XML/JSON Data Example
Calling and Consuming Webservices using Apache Camel
Apache Camel Tutorial - Send SMTP Email Using Gmail
Apache Camel Tutorial - SEDA component Hello World Example
Spring Boot + Apache Camel + RabbitMQ - Hello World Example
Apache Camel Tutorial - Idempotent Consumer using MemoryIdempotentRepository and FileIdempotentRepository
Spring Boot + Apache Camel JDBC component + MySQL - Hello World Example 
Spring Boot + Apache Camel SQL component + MySQL - Hello World Example
Spring Boot + Apache Camel SQL component + Transaction Management Example

Lets Begin

The project structure we would be creating will be as follows-



The pom.xml will be as follows-

<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">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.javainuse</groupId>
	<artifactId>apache-camel-cxfrs</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<packaging>bundle</packaging>

	<dependencies>
		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-core</artifactId>
			<version>2.12.0</version>
		</dependency>
		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-cxf</artifactId>
			<version>2.12.0</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.1</version>
			</plugin>

			<plugin>
				<groupId>org.apache.felix</groupId>
				<artifactId>maven-bundle-plugin</artifactId>
				<extensions>true</extensions>
				<version>2.4.0</version>
			</plugin>
		</plugins>
	</build>
</project>

Create the Resource class as follows. Note here that we are not going to use this class to return the response. The controller method here is returning null.

package com.javainuse.beans;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;

@Path("/")
public class EmployeeServiceResource {

	public EmployeeServiceResource() {
	}

	@GET
	@Path("/employees/{name}/")
	public String getCustomer(@PathParam("name") String name) {
		return null;
	}

}

Create the Camel Processor class as follows. Using the cxfrs endpoint we will route the message to this Processor class

package com.javainuse.beans;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;

public class CamelProcessor implements Processor {

	public void process(Exchange exchange) throws Exception {

		// Get input from exchange
		String msg = exchange.getIn().getBody(String.class);
		// set output in exchange
		exchange.getOut().setBody("Hello World " + msg);
	}

}

Next in the applicationContext.xml we configure the Rest Server using CXFRS. Also we use the cxfrs endpoint to route the incoming message to the Processor.

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cxf="http://camel.apache.org/schema/cxf"
	xmlns:jaxrs="http://cxf.apache.org/jaxrs"
	xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd
       http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">

	<cxf:rsServer id="restService" address="http://localhost:9000/employeeservice"
		serviceClass="com.javainuse.beans.EmployeeServiceResource">
	</cxf:rsServer>

	<bean id="processor" class="com.javainuse.beans.CamelProcessor" />

	<camelContext id="camelId" xmlns="http://camel.apache.org/schema/spring">
		<route>
			<from uri="cxfrs://bean://restService" />
			<process ref="processor" />
		</route>
	</camelContext>

</beans>

Next we build the application and then deploy it in JBoss Fuse as follows-

Now that the bundle has started,if we go to http://localhost:8181/cxf we see that our REST service is shown as successfully deployed. We can also get the WADL URL from here.

Since its a simple GET request we will use the browser to test it. In the browser go to the url.

Download Source Code

Download it - Apache Camel + Rest Webservice using CXFRS Integration simple example

See Also
Spring Boot Hello World Application- Create simple controller and jsp view using Maven
Spring Boot Tutorial-Spring Data JPA
Spring Boot + Simple Security Configuration
Pagination using Spring Boot Simple Example
Spring Boot + ActiveMQ Hello world Example
Spring Boot + Swagger Example Hello World Example
Spring Boot + Swagger- Understanding the various Swagger Annotations
Spring Boot Main Menu
Spring Boot Interview Questions