The application assembler is the company or person who receives application modules from component providers and assembles them into a Java EE application EAR file. The assembler or deployer can edit the deployment descriptor directly or can use tools that correctly add XML tags according to interactive selections.
A software developer performs the following tasks to deliver an EAR file containing the Java EE application:
Assembles EJB JAR and WAR files created in the previous phases into a Java EE application (EAR) file
Specifies the deployment descriptor for the Java EE application
Verifies that the contents of the EAR file are well formed and comply with the Java EE specification