Red Hat
Nov 12, 2015
by Christina Lin
In this series post I am going to show the different ways of developing a Camel web application running in JBoss EAP.
  • Spring Framework
  • CDI with Java DSL
  • XML without Spring
To make things clear and easy, I will be using the exact same Camel route for all there different methods.What this Camel route does, is it starts up a timer that will log every 5 second, simple, easy, not much going on.

Before we start develop our simple camel route, we need to a base WAR project to work on, so first we need to create a WAR file, I am sure you must have a million way to create that, every one sort of have their own best practice for this. For me, in the example, I will create one with maven, using the webapp-javaee6 artifact. 

A. Create Project, select Maven Project, 

B. Click Next when you are at New Maven Project, and it will take you to the next step, select the webapp-javaee6 artifact.

C. Add your project name, and then click Next, you will have a ready to go WAR project in your JBoss Developer Studio. (Note, for my examples later, I am going to give them different project Names)

D. Add Camel dependency in the pom.xml file (do make sure you maven repo is configure properly pointing to http://repo.fusesource.com/nexus/content/repositories/releases)

    <!-- camel -->
    <dependency>
      <groupId>org.apache.camel</groupId>
      <artifactId>camel-core</artifactId>
      <version>2.15.1.redhat-621xxx</version>
      <scope>provided</scope>
    </dependency>


E. Optional, change your JDK version accordingly in pom.xml of the WAR project.




Camel Route without Spring

Sometimes we just don't want to rely on Spring or CDI, just to keep everything simple. Camel uses the JNDI registry to achieve this. So no spring library is needed nor do we have to enable the CDI framework in JavaEE. A perfect solution if you don't want any heavy framework involve.

  • Before we start, we are going to need another camel dependency, this is the package we need to scan and kickstart our camel route.
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-servletlistener</artifactId>
            <version>2.15.1.redhat-620133</version>
        </dependency>

Under webapp, we need to create the WEB-INF/web.xml file, as we need it to configure the listener that reading our Camel route and then kicks it off. Right click on Deployment Descriptor and choose Generate Deployment Descriptor Stub. It will create an empty web.xml file for you.




  • Add the location of your camel file, and the listener that register and kicks off the camel route in the web.xml

<context-param>
    <param-name>name</param-name>
    <param-value>MyCamel</param-value>
</context-param>
<context-param>
    <param-name>routeBuilder-MyRoute</param-name>
    <param-value>classpath:myfisrtcamel.xml</param-value>
</context-param>
<listener>
    <listener-class>org.apache.camel.component.servletlistener.JndiCamelServletContextListener</listener-class>
</listener>

  • This is what your web.xml will look like:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>myjndidemo</display-name>
  
  <context-param>
    <param-name>name</param-name>
    <param-value>MyCamel</param-value>
  </context-param>
  <!-- location of Camel route xml files -->
  <context-param>
    <param-name>routeBuilder-MyRoute</param-name>
    <param-value>
    classpath:myfisrtcamel.xml
    </param-value>
  </context-param>

  <!-- the listener that kick-starts Camel -->
  <listener>
    <listener-class>org.apache.camel.component.servletlistener.JndiCamelServletContextListener</listener-class>
  </listener>
  
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>

</web-app>

  • Create folder called "resources" under main for Camel Route XML file.   



  • Then add the folder in the Class Path, right click on the project, and select Build Path, configure build path




  •  Check the resource folder we just created!




Create Camel route called "myfisrtcamel.xml", make sure choose the "Routes" framework. 


  • Within route, drag and drop timer and log component and configure them. 
    • Timer URI: timer:mytimer?period=5000
    • Log Message: JNDI EAP Camel Demo
  • This is what your XML look like: 
 <?xml version="1.0" encoding="UTF-8"?>
  <routes xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="timer:mytimer?period=5000"/>
    <log message="JNDI EAP Camel Demo"/>
  </route>
</routes>

  • And then we are done, ready to go. Run mvn clean install to generate the war file. 





  • Start up your JBoss EAP with Fuse subsystem enabled. If you are not sure how to do it, please take a look at this post. In side bin folder, start JBoss EAP with 
    • standalone.sh
    • standalone.bat
  • Go to http://localhost:9990/, login to admin console, under Runtime/

  • Click on Add, choose the war generated under the project target folder. Click Next, Next to deploy the application. 
  • Start up application by click on the En/Disable button. 


  • Switch to the log, you will find it's now printing the message "JNDI EAP Camel Demo" every 5 seconds.

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