Add type a class assumes a single instance of that type. This is simply a convience method for addAttachment(expectedType.getName(), T attachment, Class expectedType). If there are multiple instance of a type you would need different names. The ServiceMetaData example does not apply. Each ServiceMetaData instance is associated with a component deployment, a type of DeploymentUnit that has no children. DeploymentUnit component is structurally related to the owning deployment unit (a ServiceDeployment for a ServiceMetaData), and each service is a child component deployment unit with a single ServiceMetaData. I'll look to add the getParent today. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3992859#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...