Go to Window -> Preferences -> Java -> Installed JREs and add your desired jar.
Screenshots:
Question
I am creating an Eclipse runtime application, however I am having an issue with external archives.
Is it possible to configure Eclipse to include a specific library when any project is created? For instance, if I create a Java project I get JUnit and myjar.jar automatically included in the project.
Thanks.
Solution
Go to Window -> Preferences -> Java -> Installed JREs and add your desired jar.
Screenshots: