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FAQ How do I add an extra library to my project&
Open the context menu on the project, and select Properties > Java Build Path > Libraries. From here, you can add JAR files to the build path, whether they are inside your workspace or not. You can also add a class folder, a directory containing Java class files that are not in a JAR. Note that plug-in development has more restrictions on where build path entries can come from. For plug-in projects, you should always let the plug-in development tools organize your build path for you. Simply select the plugin.xml file, and choose PDE Tools > Update Classpath from the context menu.
See Also:
FAQ_How_do_I_set_up_a_Java_project_to_share_in_a_repository?
[[FAQ_When_does_PDE_change_a_plug-in%26%23146%3Bs_Java_build_path%3F]]