Deployment Plan para o weblogic. Exemplo para aplicações que não foram desenvolvidas no jdeveloper e são empacotadas como .war. Depois de fazer o deploy da aplicação, clique em update e informe o deployment plan.

gistfile1.txt

<?xml version = '1.0' encoding = 'US-ASCII'?>
<deployment-plan xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://xmlns.oracle.com/weblogic/deployment-plan http://xmlns.oracle.com/weblogic/deployment-plan/1.0/deployment-plan.xsd"
                 xmlns="http://xmlns.oracle.com/weblogic/deployment-plan">
    <application-name>ApcCustom</application-name>
    <variable-definition>
        <variable>
            <name>param</name>
            <value>novo parametro</value>
        </variable>
    </variable-definition>
    <module-override>
        <module-name>ApcCustom.war</module-name>
        <module-type>war</module-type>
        <module-descriptor external="true">
            <root-element>web-app</root-element>
            <uri>WEB-INF/web.xml</uri>
            <variable-assignment>
                <name>param</name>
                <xpath>/web-app/context-param/[param-name="param"]/param-value</xpath>
                <operation>replace</operation>
            </variable-assignment>
        </module-descriptor>
    </module-override>
</deployment-plan>