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JTA comes as an out-of-the box feature by inheriting the transaction management capabilities of the Carbon platform; while, JSF and JPA come as an additional feature that can be installed from the online Carbon p2 repository.
Name: WSO2 Carbon - J2EE Runtime Environment
Identifier: org.wso2.carbon.as.runtimes.j2ee.feature
If this feature is not bundled with the WSO2 product by default, you can install it using the instructions provided in the Feature Management section.
J2EE
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(Java EE) class loading environments
Installation of the J2EE (Java EE) feature will create a directory named j2ee containing the required libraries for JSF and JPA at the <PRODUCT_HOME>/lib/runtimes/library and update the <PRODUCT_HOME>/repository/conf/tomcat/webapp-classloading-environments.xml file by adding the new J2EE classloading environment.
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For more information Apache OpenJPA, go to http://openjpa.apache.org/builds/2.2.2/apache-openjpa/docs/main.html
Java Transaction API support
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