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chính kịp thời lựa chọn. Một nhà phát triển phần mềm thực hiện các nhiệm vụ sau đây để cung cấp một tập tin EAR có chứa các ứng dụng J2EE. • Lắp ráp các thành phần EJB JAR và web (WAR) các tập tin được tạo ra trong các giai đoạn trước đây thành một tập tin J2EE (EAR) ứng dụng. • Xác định mô tả triển khai ứng dụng J2EE | 36 Overview tive selections. A software developer performs the following tasks to deliver an EAR file containing the J2EE application. Assembles EJB JAR and web components WAR files created in the previous phases into a J2EE application EAR file. Specifies the deployment descriptor for the J2EE application. Verifies that the contents of the EAR file are well-formed and comply with the J2EE specification. Application Deployer and Administrator The company or person who configures and deploys the J2EE application administers the computing and networking infrastructure where J2EE applications run and oversees the runtime environment. Duties include such things as setting transaction controls security attributes and specifying connections to databases. During configuration the deployer follows instructions supplied by the application component provider to resolve external dependencies specify security settings and assign transaction attributes. During installation the deployer moves the application components to the server and generates the container-specific classes and interfaces. A deployer system administrator performs the following tasks to install and configure a J2EE application. Adds the J2EE application EAR file created in the preceding phase to the J2EE server. Configures the J2EE application for the operational environment by modifying the deployment descriptor of the J2EE application. Verifies that the contents of the EAR file are well-formed and comply with the J2EE specification. Deploys installs the J2EE application EAR file into the J2EE server. Reference Implementation Software The J2EE SDK is a non-commercial operational definition of the J2EE platform and specification made freely available by Sun Microsystems for demonstrations prototyping and educational uses. It comes with the J2EE application Reference Implementation Software 37 server web server relational database J2EE APIs and complete set of development and deployment tools. You can download
