[JAVA] Maven Web App J2EE Deployment descriptor

web.xml

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">
  <description>MySQL Test App</description>
  
  <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/TestDB</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
  </resource-ref>
  
  <resource-ref>
	  <description>Oracle Datasource example</description>
	  <res-ref-name>jdbc/myoracle</res-ref-name>
	  <res-type>javax.sql.DataSource</res-type>
	  <res-auth>Container</res-auth>
  </resource-ref>
  
  <resource-ref>
	  <description>postgreSQL Datasource example</description>
	  <res-ref-name>jdbc/postgres</res-ref-name>
	  <res-type>javax.sql.DataSource</res-type>
	  <res-auth>Container</res-auth>
 </resource-ref>
</web-app>