problem: working with .JSP-file over Apache 1.3.29: GET doesn't work, POST does

i wrote a test-program to check the parameters: test.jsp?par=123 in the jsp-file i read with request.getParameter("par") and show the value. www.domain.at/context/test.jsp?par=123 delivers null, but www.domain.at:8080/context/test.jsp?par=123 (directly over tomcat) delivers 123 trying the same with POST works without problems. i already found that i can restrict directory access with in http.conf. but there is no such command in my http-conf and i installed everything default. i also checked all tomcat-config-files but found nothing. what can i do?? please, need urgend help! thanks