Which ever data source you create (for instance lets say for oracle data source or mysql data source ) file name should end with “name-ds.xml” and the content should be

<?xml version="1.0" encoding="UTF-8"?>

   <datasources>
         <local-tx-datasource>
           <jndi-name>tjOracleDS</jndi-name>
            <use-java-context>false</use-java-context>
                   <connection-url>jdbc:oracle:thin:@localhost:1521:tjdb</connection-url>
                   <driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
                     <user-name>staging</user-name>
                   <password>staging</password>
                    <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name>
                        <min-pool-size>5</min-pool-size>
                   <max-pool-size>30</max-pool-size>
                   <blocking-timeout-millis>5000</blocking-timeout-millis>

                 <metadata>
                    <type-mapping>Oracle9i</type-mapping>
                 </metadata>
         </local-tx-datasource>

       </datasources>

<use-java-context>false</use-java-context>

This help us to remove java:comp from jndi look up for data source