QuartzInitializerServlet use a init-param 'shutdown-on-unload' but when the servlet tries to convert this value to a boolean use the following instruction:
            if(shutdownPref != null)
                performShutdown = Boolean.getBoolean(shutdownPref);

which is bad because this tries to find if in System Properties a property with the name 'shutdown-on-unload' exists.

To solve this problem use the following:
            if(shutdownPref != null)
                performShutdown = Boolean.valueOf(shutdownPref).booleanValue();

Cheers,
Liviu