FAQ How do I load source files edited outside Eclipse?
You can achieve a minimal level of Eclipse integration without writing a single line of Eclipse-specific tooling code. Add resource files to a project in your workspace. Edit and compile the source files outside Eclipse or by using the Eclipse text editor. Make sure that the files get copied into the project’s output directory, usually the bin directory. Intermittently refresh your Eclipse Navigator so that you can access the generated bytecode files. The only integration is the sharing of class files through the file system. But at least it allows for preliminary and rudimentary experimentation without writing any Eclipse plug-ins.