<datasource jta="true" jndi-name="java:/datasources/DATASOURCEBD" pool-name="APLICACIONWEB" enabled="true" use-ccm="false">
  <connection-url>jdbc:oracle:thin:@192.168.1.57:1521:ORCL</connection-url>
  <driver-class>oracle.jdbc.OracleDriver</driver-class>
  <driver>OracleJDBCDriver</driver>
  <security>
    <user-name>USERDB</user-name>
    <password>CLAVE</password>
  </security>
  <validation>
    <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleValidConnectionChecker"/>
    <background-validation>true</background-validation>
    <stale-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleStaleConnectionChecker"/>
    <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter"/>
  </validation>
</datasource>

<jboss-web>
    <resource-ref>
        <res-ref-name>jdbc/AppDSLocal</res-ref-name>
        <jndi-name>java:/datasources/DATASOURCEBD</jndi-name>
    </resource-ref>
</jboss-web>

<web-app>
    <resource-ref>
        <description>DB Connection</description>
        <res-ref-name>jdbc/AppDSLocal</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>
</web-app>

public final class DBHelper {

  @Resource(name = "jdbc/AppDSLocal")
  private DataSource datasource;

  public Connection getConecction() {
    try {
      Connection connection =  datasource.getConnection();
      return connection;
    }
    catch(NamingException ne) {
      throw new PersistenceException("Error al obtener conexion", ne);
    }
    catch(SQLException sqle) {
      throw new PersistenceException("Error ", sqle);
    }
  }
}

01:14:27,147 ERROR [stderr] (default task-2) java.lang.NullPointerException