3.4. Prevent a Module Being Implicitly Loaded

This task describes how to configure your application to exclude a list of module dependencies.

You can configure a deployable application to prevent implicit dependencies from being loaded. This is commonly done when the application includes a different version of a library or framework than the one that will be provided by the application server as an implicit dependency.

Prerequisites

You must already have a working software project that you want to exclude an implicit dependency from.
You must know the name of the module to exclude. Refer to Section 3.8.1, “Implicit Module Dependencies” for a list of implicit dependencies and their conditions.

Procedure 3.4. Add dependency exclusion configuration to jboss-deployment-structure.xml

If the application has no jboss-deployment-structure.xml file, create a new file called jboss-deployment-structure.xml and add it to the project. This file is an XML file with the root element of <jboss-deployment-structure>.
```
<jboss-deployment-structure>

</jboss-deployment-structure>
```
```
<jboss-deployment-structure>

</jboss-deployment-structure>
```
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For a web application (WAR) add this file to the WEB-INF directory. For an EJB archive (JAR) add it to the META-INF directory.
Create a <deployment> element within the document root and an <exclusions> element within that.
```
<deployment>
   <exclusions>
   
   </exclusions>
</deployment>
```
```
<deployment>
   <exclusions>
   
   </exclusions>
</deployment>
```
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Within the exclusions element, add a <module> element for each module to be excluded. Set the name attribute to the name of the module.
```
<module name="org.javassist" />
```
```
<module name="org.javassist" />
```
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Example 3.5. Excluding two modules

<jboss-deployment-structure>
   <deployment>
      <exclusions>
         <module name="org.javassist" />
         <module name="org.dom4j" />
      </exclusions>
   </deployment>
</jboss-deployment-structure>

<jboss-deployment-structure>
   <deployment>
      <exclusions>
         <module name="org.javassist" />
         <module name="org.dom4j" />
      </exclusions>
   </deployment>
</jboss-deployment-structure>

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3.4. Prevent a Module Being Implicitly Loaded

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