4.4. Configure a Web Application to use a Valve

Valves that are not installed as global valves must be included with your application and configured in the jboss-web.xml deployment descriptor.

Important

Valves that are installed a global valves are automatically applied to all deployed applications.

Prerequisites

  • The valve must be created and included in your application's classpath. This can be done by either including it in the application's WAR file or any module that is added as a dependency. Examples of such modules include a static module installed on the server or a JAR file in the lib/ directory of an EAR archive if the WAR is deployed in an EAR.
  • The application must include a jboss-web.xml deployment descriptor.

Procedure 4.1. Configure an application for a local valve

  1. Add Valve element

    Add a valve element with the attributes of name and class-name to the application's jboss-web.xml file. Name is a unique identifier for the valve and class-name is the name of the valve class. 
    <valve>
      <class-name>VALVECLASSNAME</class-name>
</valve>

  2. Specific Parameters

    If the valve has configurable parameters, add a param child element to the valve element for each parameter, specifying the name and value for each. 
    <param name="PARAMNAME" value = "VALUE" />
When the application is deployed, the valve will be enabled for the application with the specified configuration.

Example 4.1. jboss-web.xml valve configuration

<valve>
    <class-name="org.jboss.samplevalves.restrictedUserAgentsValve">
    <param name="restricteduseragents"  value = "^.*MS Web Services Client Protocol.*$" />
</valve>
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