수다닷컴

ejb sessionbean 작성하면서
----------------------------------입력받는 jsp 소스 --------------
%@ page contenttype=text/html;charset=euc-kr%
html
headtitle방명록 글쓰기 폼/title/head
body
form method=post action=samplewrite.jsp
번호 : input type=text sno=snobr
이름 : input type=text name=namebr
나이 : input type=text old=oldbr
내용 : input type=text area=areabrhr
input type=submit value=확인 a href=samplelist.jsp리스트로 돌아가기/a
/form
/body
/html
----------------------------------------------저장되는 부분
public void addsamplebean(sampledatabean sd){ // 저장 insert
connection con = null;
preparedstatement stmt = null;
string sql = insert into sample values(?, ?, ?, ?);

try{
con = ds.getconnection();
con.setautocommit(false);
stmt = con.preparestatement(sql);
stmt.setint(1,sd.getsno());
stmt.setstring(2,sd.getname());
stmt.setint(3,sd.getold());
stmt.setstring(4,sd.getarea());
stmt.executeupdate();
con.commit();
}catch(exception ie){
system.out.println(저장 오류:+ie.tostring());
}finally{
try{
con.close();
}catch(exception ce){
system.out.println(connection close error: +ce.tostring());
}
try{
stmt.close();
}catch(exception se){
system.out.println(statement close error: +se.tostring());
}
}
}
---------------------------------------------------------------------
---에러메세지..

error 500--internal server error
java.lang.numberformatexception: null
at java.lang.integer.parseint(integer.java:436)
at java.lang.integer.parseint(integer.java:518)
at jsp_servlet._sample.__samplewrite._jspservice(__samplewrite.java:148)
at weblogic.servlet.jsp.jspbase.service(jspbase.java:33)
at weblogic.servlet.internal.servletstubimpl$servletinvocationaction.run(servletstubimpl.java:996)
at weblogic.servlet.internal.servletstubimpl.invokeservlet(servletstubimpl.java:419)
at weblogic.servlet.internal.servletstubimpl.invokeservlet(servletstubimpl.java:463)
at weblogic.servlet.internal.servletstubimpl.invokeservlet(servletstubimpl.java:315)
at weblogic.servlet.internal.webappservletcontext$servletinvocationaction.run(webappservletcontext.java:6452)
at weblogic.security.acl.internal.authenticatedsubject.doas(authenticatedsubject.java:321)
at weblogic.security.service.securitymanager.runas(securitymanager.java:118)
at weblogic.servlet.internal.webappservletcontext.invokeservlet(webappservletcontext.java:3661)
at weblogic.servlet.internal.servletrequestimpl.execute(servletrequestimpl.java:2630)
at weblogic.kernel.executethread.execute(executethread.java:219)
at weblogic.kernel.executethread.run(executethread.java:178)

위와 같은 오류는 왜 발생하는 건가요.....

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