Migrating the server environment and configuration

Migration of the server environment and configuration involves configuring a JEUS 7 environment, which is based on JEUS 6's environment configuration. An upgrading tool is provided for convenience in this step, and many parts are automated. However, depending on the installation environment, there are some parts that cannot be automated. JEUS 6 and 7 are fundamentally different in many ways such as the adoption of the domain structure. Therefore, there may be some parts that may need to be performed manually during an upgrade.

Migrating applications

If an application is compliant with the Java EE standard, only external configurations such as JEUS deployment descriptor need to be converted to be compatible. To do so, JEUS 7 provides a function for upgrading JEUS DD (Deployment Descriptor) during deployment. However, for applications that are not compliant, applications that did not cause problems in the previous version but originally written improperly, or applications written using a non-public internal JEUS API or assuming an internal structure, may not run properly. This is a phenomenon that can occur due to internal architectural changes or strengthened validation checks as the JEUS version is upgraded. In such cases, applications may need to be modified.