8.2.2.3. Exclude Beans From the Scanning Process
Task Summary
One of the features of Weld, the JBoss Enterprise Application Platform's implementation of CDI, is the ability to exclude classes in your archive from scanning, having container lifecycle events fired, and being deployed as beans. This is not part of the JSR-299 specification.
Example 8.1. Exclude packages from your bean
The following example has several <weld:exclude> tags.
- The first one excludes all Swing classes.
- The second excludes Google Web Toolkit classes if Google Web Toolkit is not installed.
- The third excludes classes which end in the string
Blether
(using a regular expression), if the system property verbosity is set tolow
. - The fourth excludes Java Server Faces (JSF) classes if Wicket classes are present and the viewlayer system property is not set.
<beans xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:weld="http://jboss.org/schema/weld/beans" xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://docs.jboss.org/cdi/beans_1_0.xsd http://jboss.org/schema/weld/beans http://jboss.org/schema/weld/beans_1_1.xsd"> <weld:scan> <!-- Don't deploy the classes for the swing app! --> <weld:exclude name="com.acme.swing.**" /> <!-- Don't include GWT support if GWT is not installed --> <weld:exclude name="com.acme.gwt.**"> <weld:if-class-available name="!com.google.GWT"/> </weld:exclude> <!-- Exclude classes which end in Blether if the system property verbosity is set to low i.e. java ... -Dverbosity=low --> <weld:exclude pattern="^(.*)Blether$"> <weld:if-system-property name="verbosity" value="low"/> </weld:exclude> <!-- Don't include JSF support if Wicket classes are present, and the viewlayer system property is not set --> <weld:exclude name="com.acme.jsf.**"> <weld:if-class-available name="org.apache.wicket.Wicket"/> <weld:if-system-property name="!viewlayer"/> </weld:exclude> </weld:scan> </beans>
The formal specification of Weld-specific configuration options can be found at http://jboss.org/schema/weld/beans_1_1.xsd.