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WSO2 invites you to contribute by by checking out the source  from from the Subversion (SVN) source control system,   building the product  and and making changes, and then then committing your changes  back back to the source repository. (For more information on Subversion, see see http://svnbook.red-bean.com.) The following sections describe this process:

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Checking out the source

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checkout checkout

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WSO2 products are built on top of WSO2 Carbon Kernel, which contains the Kernel libraries used by all products. When there are changes in the Carbon Kernel, they are bundled and released in a new new WSO2 Carbon version version (for example, WSO2 Carbon 4.2.0).

A WSO2 platform release is a set of WSO2 products based on the same Carbon release. For example,   Turing is the platform release name for WSO2 Carbon 4.2.0 and the WSO2 products that are based on it. Usually, not all products in a platform get released at the same time, so they are released in in chunks, each of which contains the Carbon release and a subset of products. For  For example, chunk 10 8 of the Turing platform release contains the Turing platform release contains Carbon 4.2.0 plus DSS Task Server 1.1.0, Data Services Server 3.12.0 and IS 4.5Complex Event Processor 3.1.0. When you want to build a product from source, you download and build the appropriate platform chunk. (To determine which chunk to use for a specific product version

Checking out the patches

Before checking out the product source, you need to checkout the patches related to the Carbon chunk using the following command.

$ svn checkout https://svn.wso2.org/repos/wso2/carbon/kernel/branches/4.2.0/ <local-platform-directory-1>

Downloading the product source

For products based on WSO2 Carbon 4.2.0, use the below command to download the product source:

$ svn checkout https://svn.wso2.org/repos/wso2/carbon/platform/tags/turing-<release-chunk>/ <local-platform-directory-2>

Replace <release-chunk> with the release chunk, on which the specific product version is based on. To find out the respective release chunk, see the Release Matrix).. For example, for products including WSO2 MB 2.2.0 is released in Turing chunk 10, which you can download using the  checkout command as shown below (replace <local-platform-directory> with a meaningful name, such as wso2carbon-platform), which are based on Chunk 11 of WSO2 Carbon 4.2.0, the command is as follows:

$ svn checkout https://svn.wso2.org/repos/wso2/carbon/platform/tags/turing-chunk10chunk11/ <local-platform-directory>
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Setting up your development environment

Before you edit the source code in your IDE, set up your development environment by running one of the following commands:

If you are using a later Eclipse version and if you get errors (library path etc.) when trying to import the source code using the Existing Projects into Workspace, follow the steps below to solve them by importing the source code as a Maven project.

1. Build the source using the command: mvn clean install
2. Open Eclipse and click Import in the File menu and then click Existing Maven Projects as shown below: 
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Building the product 

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build build

Before you build:Follow the instructions below to build the product after editing the source code:

1. Install Maven and JDK. See See Installation Prerequisites for for compatible versions. 
2. Set the environment variable  variable MAVEN_OPTS=”"-Xms1024m -Xmx4096m -XX:MaxPermSize=1024m” "to avoid the Maven Maven OutOfMemoryError.

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1. Navigate to each folder representing the patches within the <local-platform-directory-1> and run the following Apache Maven commands to build the patches. For information on the patches, which are applicable for the respective Carbon chunk release, go to Release Matrix. 

2. For products based on Carbon 4.2.0, to create complete release artifacts of the products released with this chunk version, including the binary and source distributions, go

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1. to <local-platform-

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1. directory-2>/ product-releases/

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1. <release-chunk>/directory and run

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1. the Apache Maven commands stated in the above step. To build only a selected product/s,

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1. open <local-platform-

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1. directory-2>/product-releases/

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1. <release-

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1. chunk>/products/pom.xml

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1.  file, and comment out the products you do not want to build and run the relevant Maven command.

Setting up your development environment

Before you edit the source code in your IDE, set up your development environment by running one of the following commands:

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Committing your changes

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commit commit

If you are a committer, you can commit your changes using the following command (SVN will prompt you for your password):

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