Besides the fat JAR we also offer the modular JAR "pdfreactorcore.jar". This JAR only contains classes from the "com.realobjects" base package. It is not available as a separate download but is included in any of the PDFreactor installers. The JAR is located in the "PDFreactor/lib/modular" directory. The subdirectories "required" and "optional" contain required and optional third-party JARs, respectively. Please refer to the "PDFreactor/lib/README.txt" file for more information about the modular JAR and the third party dependencies.