slik som koden var i stad får jeg:


Note: sun.tools.javac.Main has been deprecated.
/locals/web/folk/mortenmj/tdt4105/oppg3/gjestebok.jsp:32: Incompatible
type for int. Can't convert int to null.
              else if ( karakter == null ) {
                                 ^
1 error, 1 warning

om jeg fjerner:

else if ( karakter == null ) {
  karakter = 0; }

får jeg:

java.lang.NumberFormatException: null
	at java.lang.Integer.parseInt(Integer.java:436)
	at java.lang.Integer.parseInt(Integer.java:518)
	at _mortenmj._tdt4105._oppg3._gjestebok__jsp._jspService(/locals/web/folk/mortenmj/tdt4105/oppg3/gjestebok.jsp:21)
	at com.caucho.jsp.JavaPage.service(JavaPage.java:75)
	at com.caucho.jsp.Page.subservice(Page.java:486)
	at com.caucho.server.http.FilterChainPage.doFilter(FilterChainPage.java:182)
	at com.caucho.http.security.SecurityFilter.doFilter(SecurityFilter.java:115)
	at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
	at com.caucho.server.http.Invocation.service(Invocation.java:311)
	at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:218)
	at com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:160)
	at com.caucho.server.TcpConnection.run(TcpConnection.java:137)
	at java.lang.Thread.run(Thread.java:534)



Gjør slik:

int karakter;
try {
   karakter = Integer.parseInt(Request.getParameter("karakter"));
} catch (NumberFormatException ex) {
   karakter = 0;
}