You need to define J2EE libraries to provide reusable components for multiple applications on the J2EE Engine.
To define J2EE libraries in the SAP NetWeaver Developer Studio, you first create a corresponding Library project (see Creating a New Library Project).Then you have to add all necessary JAR files or references to other J2EE Engine components (see Adding JARs or References). Afterwards, you only need to create a corresponding library archive, and then deploy it on the J2EE Engine (see Creating a Library Archive and Deploying a Library Archive).