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For convenience the JARs in the lib directory were added to the extension classloader's classpath using the java.ext.dirs system property, rather than listing the full path to each of the JARs after the -cp flag. Because the classloader extension is the parent of the classloader application, the client classes is able to find all of the Microcontainer classes and the Human Resources service classes at run-time. Note With Java versions 6 and higher, you can use a wild-card to include all JARs in a directory with the -cp flag: java -cp `pwd`/lib/*:.:client-1.0.0.jar org.jboss.example.client.Client $1 Here, all of the classes in the application will be added to the application classloader's classpath, and the extension classloader's classpath will retain its default value.