The Dependencies panel displays the web application libraries, their paths, and deployment strategies in the project as well as enables you to Add a Web Application Library, Remove a Web Application Library, change the order of libraries and Change a Web Application Deployment Strategy used in the project.
Libraries - If you want to use the same set of sources in multiple projects, you can set it in the project as a web application library and share it among different users and projects as a separate project. There are two types of extension libraries that can be added to a project:
Libraries that depend on existing web application projects.
Libraries that depend on existing web application JAR files.
Use an web application library that depends on a JAR file when the JAR file satisfies one of the following conditions:
The JAR file represents an API that resides on the target platform but is not deployed.
The JAR file contains classes that must be included in the JAR file generated for the project.
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