cooper.jar is a small library that can be optionally used in Elements projects for the Java and Android platform compiled with the RemObjects Elements compiler. It provides some of the core runtime types that expand upon what's provided by the platform, as well as helper classes and functions.
cooper.jar ships precompiled with the Elements compiler, and new projects created with one of the Java project templates will automatically have a reference to the library. Should you need to add a reference manually, you can do so via the Add References dialog in Fire or Visual Studio, where cooper.jar should show automatically.
cooper.jar used to be called com.remobjects.elements.rtl.jar.
The code for this library is open source and available under a liberal license. We appreciate contributions.