: To import full application modules, use File > Import and select the specific archive type, such as WAR File or EAR File .

If you plan to use the same JAR files across multiple projects, you can define them once as a "User Library".

(choose "User" for global use or "Project" for a specific one). Class Path node, click

You have two primary methods for adding external code depending on whether you want to use a pre-existing JDeveloper library or a raw file:

To import a library into Oracle JDeveloper, you can either add a direct JAR file to a specific project or create a reusable library definition Oracle Forums Option 1: Add a JAR Directly to a Project

Project Rebuild: If classes aren't recognized, go to Build > Clean All and then Rebuild to refresh the IDE index.