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With JBoss Enterprise Application Platform 4.x, a deployer existed to handle a specified deployment type and that was the only deployer that would process the deployment. In JBoss Enterprise Application Platform 5, multiple deployers transform the metadata associated with a deployment until its processed by a deployer that creates a runtime component from the metadata. Deployment has to contain a descriptor that causes the component metadata to be added to the deployment. The types of deployments for which deployers exists by default in the JBoss Enterprise Application Platform include: