Preexisting Software Checking

The installer examines the host on which you are installing and identifies the Java ES components that are already installed. The installer then checks at several levels to ensure that all existing components are at the appropriate release level to interoperate successfully. The installer informs you about those software components that are incompatible and must be upgraded or removed.

Similarly, the installer checks for Java ES shared components such as J2SE or NSS that are already installed and lists any incompatibilities (see Shared Components). If you proceed with installation, the installer automatically upgrades the shared components to newer versions.