J2EE study NOTE 2: configure a simple J2EE test environment

As mentioned above, different vendors provide their own J2EE solutions, such as IBM WebSphere and BEA WebLogic. All the examples in this book are run in a reference implemention) the reference implementation is provided by Sun free of charge, which fully complies with J2EE specifications. It should be noted that this reference implementation is just a working model and is not suitable for enterprise-level deployment. It does not provide any enterprise-level features beyond J2EE specifications, such as cluster and disaster recovery, the book uses this reference to test and develop applications that comply with J2EE specifications. By using this reference implementation, we don't have to worry about the characteristics specific to those J2EE implementations, but focus on the core J2EE concepts that are followed by all vendors.

From this address http://java.sun.com/j2ee/1.4/, you can go to the J2EE 1.4 SDK, which contains the Java System Application Server pe8.2 provided by jsun for free. In order to be consistent with the book, my next address is 1.4.Java ee 5 SDKIt has also come out. After the downloaded j2eesdk-00004_03-windows.exe is installed, it is OK. Before installation, make sure that j2se has been installed. As mentioned earlier, all components in J2EE are based on j2se. After the installation is complete, you can perform simple J2EE development. For example, write a simple EJB, ^ _ ^.