Apache Camel + Rest Webservice using JAX-RS Hello World Example | JavaInUse






Apache Camel + Rest Webservice using JAX-RS Hello World Example

In this post we will expose a REST Webservice using Apache Camel and JAX-RS. Java API for RESTful Web Services (JAX-RS) is a Java programming language API spec that provides support in creating web services according to the Representational State Transfer (REST) architectural pattern.
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. In the next post we implement REST using Apache Camel and CXFRS

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

Video

This tutorial is explained in the below Youtube Video.

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-jaxrs</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-
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 "Welcome " + name;
	}

}

Next in the applicationContext.xml we configure the Rest Server using JAX-RS.
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:jaxrs="http://cxf.apache.org/jaxrs" xmlns:camel="http://camel.apache.org/schema/spring"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd      
        http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
        http://cxf.apache.org/transports/http/configuration http://cxf.apache.org/schemas/configuration/http-conf.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">

	<jaxrs:server id="restService" address="http://localhost:9000/employeeservice">
		<jaxrs:serviceBeans>
			<ref bean="employeeService" />
		</jaxrs:serviceBeans>
	</jaxrs:server>

	<bean id="employeeService" class="com.javainuse.beans.EmployeeServiceResource" />
</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 JAX-RS 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