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Building Camel from Source

Camel uses Maven as its build and management tool. If you don't fancy using Maven you can use your IDE directly or Download a distribution or JAR.

Prequisites

Required:

  • Download and install Maven.
    (Maven [3.0.2,3.1.0) is required to build Camel 2.10 onwards).
    (Maven [3.0.4,3.1.0] is required to build Camel 2.11 onwards).
  • Get the latest Source
  • Java 1.6
    (Java 1.7 is supported from Camel 2.10 onwards)

Optional:

  • Prince should be in the executable PATH to generate the PDF documentation

Maven options

To build camel maven has to be configured to use more memory

Unix/Linux/Mac
export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=512m"
Windows
set MAVEN_OPTS=-Xmx1024m -XX:MaxPermSize=512m

A normal build

mvn clean install

A normal build without running tests

mvn clean install -Pfastinstall

A normal build without running tests but checkstyle verification enabled

mvn clean install -Pfastinstall,sourcecheck

Doing a Quick Build

Available as of Camel 2.6

The following skips building the manual, the distro and does not execute the unit tests.

mvn install -Pfastinstall

Using an IDE

If you prefer to use an IDE then you can auto-generate the IDE's project files using maven plugins. e.g.

IntelliJ

mvn idea:idea

Eclipse

There are several ways to import the projects into Eclipse.

m2e

At this point, usage of the m2e plugins to import Camel into Eclipse does not work due to plugins without LifeCycle hints, bundle plugin configuration problems, etc... Patches, notes, etc... to help get this supported would be more than welcome.

maven-eclipse-plugin

The maven-eclipse-plugin can be used to generate the .classpath/.project/.settings file that Eclipse need. To do this, run:

mvn process-test-sources eclipse:eclipse

Enable the apt Profile explicitly if using Java 6

Per default this profile is enabled only when using Java 7+ however for many of the Camel components you would still need the org.apache.camel:spi-annotations Maven module on the class path inside the generated .classpath. To force this on Java 6 do:

mvn -Papt process-test-sources eclipse:eclipse

As otherwise some of the Camel components inside your eclipse workspace would not compile (when using Java 6) because the org.apache.camel:spi-annotations Maven module would be missing on the class path.

or

mvn -Psetup.eclipse -Declipse.workspace.dir=/path/to/your/workspace

The latter is recommended as it would completely setup the workspace for you as well as provide options to wire in other projects also found in your workspace.

After running the above command, from within Eclipse, do "File -> Import -> Existing Projects into Workspace", select the root camel checkout location and Eclipse should find all the projects.

Adding Camel Eclipse templates to your workspace

The above mentioned setup.eclipse profile does a few additional things to your workspace:

  1. Adds the Camel code templates (see here)
  2. Sets the M2_REPO variable in the workspace that points to your local Maven repository (i.e., ~/.m2/repository on Unix and c:\Documents and Settings\<user>\.m2\repository on Windows) which allows the jars to be resolved.
Hint: specify the workspace location in your .m2/settings.xml

You can add a profile to your .m2/settings.xml to specify your eclipse workspace location so you can avoid having to type that each time you need to update the projects.

<profiles>
    <profile>
        <id>setup.eclipse</id>
        <properties>
            <eclipse.workspace>/path/to/your/workspace</eclipse.workspace>
        </properties>
    </profile>
</profiles>

Building with checkstyle

To enable source style checking with checkstyle, build Camel with the -Psourcecheck parameter

mvn -Psourcecheck clean install

Building source jars

If you want to build jar files with the source code, that for instance Eclipse can important so you can debug the Camel code as well. Then you can run this command from the camel root folder:

mvn clean source:jar install -Pfastinstall

Building with Spring 3.0

Support for Spring 3.0 is deprecated from Camel 2.11 onwards.

From Camel 2.11.0 onwards, if you want Camel to be build against Spring 3.0 you have to build with the maven profile spring3.0.

mvn clean install -Pspring3.0

Building with Spring 3.1

From Camel 2.10.0 onwards, if you want Camel to be build against Spring 3.1 you have to build with the maven profile spring3.1.

mvn clean install -Pspring3.1

From Camel 2.11.0 onwards, Spring 3.1 is the default.

Note: the camel-test-spring component requires to be built with Spring 3.1.

Building with Spring 3.2

From Camel 2.11.0 onwards, if you want Camel to be build against Spring 3.2 you have to build with the maven profile spring3.2.

mvn clean install -Pspring3.2

From Camel 2.12.0 onwards, Spring 3.2 is the default.

 

Building with Spring 4.0

From Camel 2.13.0 onwards, if you want Camel to be build against Spring 4.0 to work around the back compatible issue CAMEL-7074, you have to build with the maven profile spring4.

mvn clean install -Pspring4

From Camel 2.12.0 onwards, Spring 3.2 is the default.

Working with features

If you change anything in the features.xml from platform/karaf you can run a validation step to ensure the generated features.xml file is correct. You can do this running the following maven goal from the platform directory.

mvn clean install -Pvalidate

See Also

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