Current JEE specifications reduce the number of configuration files, but the container is now required to do most of the work using @annotations. In order to get @annotation info, containers must scan classes. This scanning creates a performance penalty.

But to reduce the amount of scanning, the Microcontainer provides another descriptor hook, by means of jboss-scanning.xml.

<scanning xmlns="urn:jboss:scanning:1.0">
  <path name="myejbs.jar">
    <include name="com.acme.foo"/>
    <exclude name="com.acme.foo.bar"/>
  </path>
  <path name="my.war/WEB-INF/classes">
    <include name="com.acme.foo"/>
  </path>
</scanning>