Apache Camel workshop at BarcelonaJUG in January 2014

Workshop with Apache Camel

Claus Ibsen (@davsclaus)
Principal Software Engineer, Red Hat
Barcelona JUG, january 2014

1

PUBLIC PRESENTATION | CLAUS IBSEN

Agenda
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Prerequisite

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Try 1st Camel Example

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Create new Camel project
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Deploy our application to Apache Tomcat

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Modify the application and use servlet/restlet

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Install hawtio in Apache Tomcat

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2

REST project with Apache CXF-RS
Fabric8 Demo


Pre-Requisite
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Maven 3.0.4 (or 3.1.1 most likely works now)

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Eclipse, IDEA or NetBeans

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Apache Camel 2.12.2

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3

Java 7

hawtio 1.2.2


Agenda
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Prerequisite

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(REST project with Apache CXF-RS)

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4

(Create new Java Camel project)

Fabric8 Demo

Try 1st Apache Camel Example
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Extract Apache Camel 2.12.2

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Read the readme file and follow instructions

Mind a little bug in Camel 2.12.2 in the camel-stream component.
Is fixed in 2.12.1 and upcoming 2.12.3

5


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Exercise 1
Make the example lower case instead!

6


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Open example in IDE
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7

IDEA is just open project → locate the pom.xml file


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Open example in IDE
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8

Eclipse → File → Import … → Existing Maven Project


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Open example in IDE
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9

Select root folder …


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10

Edit the source code
src/main/resources/META-INF/
spring/camel-context.xml


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Run the example from IDE

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… type the command which was listed in the readme

11


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Run the example from IDE

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… type the command which was listed in the readme

12


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13

The console is within the IDE


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Run Maven in IDEA

I had to override maven home to 'fix this'

14


Agenda
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Prerequisite

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Fabric8 Demo

15


Create a new Camel project
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Exercise 2
Create a new Camel Web project,
deployable in Apache Tomcat

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Use the Maven Archetype
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camel-archetype-web

From the command line


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Or from IDE
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File → New Project... → New Maven Project


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Or from IDE
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Filter by Camel and select camel-archetype-web


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Build the WAR

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… and deploy to Apache Tomcat

.. and start Tomcat
… and see output on console
20


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Exercise 3
Modify application to listen on HTTP endpoint
and return a response message to client

21


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Add camel-servlet to Maven pom.xml

… add servlet in WEB-INF/web.xml

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Add modify Camel route

… build WAR and deploy to Tomcat by copying WAR

… and try from browser

23


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Modify Camel route to add content based router


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Exercise 4
Add Content Based Router and return
two different kind of reply messages

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Modify Camel route to add content based router


26


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Exercise 5
Install hawtio and browse the route and
see runtime statistics
Try to update the route from hawtio
And try the debugger also.

27


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Download hawtio 1.2.2 default WAR
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http://hawt.io/getstarted/index.html

Copy .war to Apache Tomcat and rename to
hawtio.war

And access hawtio from web browser
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http://localhost:8080/hawtio


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Update route


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Debug route


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Exercise 6
Modify application to use restlet for simple
REST service as a Camel route

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Add camel-restlet to Maven pom.xml

… and modify route

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After deploy to Apache Tomcat try from browser


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Notice we are using port 8081 and not the servlet
container from Apache Tomcat.
To do so see details at
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http://camel.apache.org/restlet


Agenda
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Prerequisite

●


●

●


●


●


●


●

Fabric8 Demo

34


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REST using pure Apache CXF (no Camel)

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Example
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35

https://github.com/fabric8io/fabric8/tree/master/quickstarts/re

Use JAX-RS annotations


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Setup Apache CXF-RS server
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36

Easier to do in Spring or OSGi Blueprint XML file


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REST using pure camel-cxfrs (with Camel)
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Uses route(s) as input

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Define API in java interface/class (as if JAX-RS)
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Either as interface
Or class implementation with no logic

Two binding modes
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Default

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Simple (in fact simpler and better)
Sorry at this I didn't have the time to implement
a Camel cxf-rs example for you

37


Agenda
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Prerequisite

●


●

●


●


●


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Fabric8 Demo

38


Fabric8 Demo

http://fabric8.io
39


Fabric8 Demo
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Follow Getting Started Guide

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Start Fabric8

http://fabric8.io
40


Fabric8 Demo
Create Fabric
(just use admin/admin for credentials)

… open web browser - http://localhost:8181/

41


Fabric8 Demo
Switch to Fabric Perspective
Install the camel wiki example
1. Click Configuration
2. Navigate up the tree → example → camel
3. Click wiki

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Fabric8 Demo
4. Click the new button
5. Enter a container name
6. And click Create Container
Container being created …

43


Fabric8 Demo
7. Click container to see its details
8. Click connect button to connect to it

9. And you see the logs of the container

44


Fabric8 Demo
7. Click container to see its details
8. Click connect button to connect to it

9. And you see the logs of the container

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Fabric8 Demo
10. Close the window and get back to the root container
11. Click on wiki to be able to edit the Camel route

12. Click on camel.xml to
open Camel editor

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Fabric8 Demo
13. The editor opens and you can
edit the Camel route
14. Click apply and save to
save changes
15. The container is updated.
Connect to the container to see
the updated changes.

47


Fabric8 Demo
Install and try the Loan Broker Example

See video how to do that
http://vimeo.com/album/2635012/video/84674508
… and there are more videos here
http://vimeo.com/album/2635012
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Apache Camel workshop at BarcelonaJUG in January 2014

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