This is what I have in kamailio.cfg
loadmodule "app_java.so" modparam("app_java", "class_name", "Kamailio") modparam("app_java", "child_init_method", "child_init") modparam("app_java", "java_options", "-Djava.compiler=NONE") modparam("app_java", "force_cmd_exec", 0)