The Libraries panel of the Project Properties dialog box enables you to set the class library resources that make up the compile-time classpath for your project. You can include a library in the the application WAR file by selecting the Package checkbox. You can open the Project Properties dialog box from the Projects window by right-clicking a main project node and choosing Properties. Then, in the Categories list on the left side, select the Libraries node.
If you want to change the version of the Java language that you are using for your application, choose another version from the Java Platform drop down list. You can click Manage Platforms to add more versions of the Java language to this list.
The Compile-time Libraries box lists the class library resources that make up the compile-time classpath for your project. You can select the Package checkbox to the right of a library to include the library in the application WAR file.
You can add the following items to the current project's classpath:
Besides the buttons on the right side of the panel described above, you can use the Remove button to remove items and the Move Up and Move Down buttons to change the order of items.
There is a checkbox at the bottom of the page labeled Build Required Projects (Libraries and Additional WAR Content). By default, all projects required by your project are compiled when you build your project. You can uncheck this box to speed up compilation at the risk of not having some required projects up to date.