Exclusive event generation for the COMPASS II experiment at CERN and improvements for the Monte Carlo chain Zusammenfassung: Measuring exclusive production processes to a high precision allows an access to the generalized parton distributions (GPDs). These GPDs can be used according to Jis sum rule which gives an access to the total angular momentum of the quarks and gluons. The COMPASS II experiment at CERN is designed to carry out these measurements.This thesis comprises the development of an event generator for exclusive photon and meson production in the COMPASS II kinematic. In this process the Goloskokov and Kroll model for exclusive neutral pion production has been implemented. Furthermore several improvements for the Monte Carlo software were introduced to the COMPASS II reconstruction software. The main objective of this work was an increase of the overall accuracy and performance of the Monte Carlo chain for experimental acceptance studies and model comparisons