JSP NullPointerExeption

<%@page contentType=\"text/html\"%>
<%@page import = \"java.sql.*\"%>
<jsp:useBean id = \"edu_bean\" scope = \"page\" class = \"edu_bean\" />
<jsp:useBean id = \"Leverandoer\" scope = \"page\" class = \"Leverandoer\" />
<jsp:useBean id = \"edu_type_bean\" scope = \"page\" class = \"edu_type_bean\" />

<%String id = request.getParameter(\"edu_id\");%>

Jeg får en fejl når forsøger at hente en værdien edu_id når denne ikke er der. Værdien sendes nemlig ikke med hver gang hvilket er meningen. Hvordan undgår jeg det?


JSP Error

Exception:
java.lang.NullPointerException
    at _demo._lm._chef._indeks2__udd__opret._jspService(_indeks2__udd__opret.java, Compiled Code)
    at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java, Compiled Code)
    at oracle.jsp.app.JspApplication.dispatchRequest(JspApplication.java, Compiled Code)
    at oracle.jsp.JspServlet.doDispatch(JspServlet.java, Compiled Code)
    at oracle.jsp.JspServlet.internalService(JspServlet.java, Compiled Code)
    at oracle.jsp.JspServlet.service(JspServlet.java, Compiled Code)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
    at org.apache.jserv.JServConnection.processRequest(JServConnection.java, Compiled Code)
    at org.apache.jserv.JServConnection.run(JServConnection.java, Compiled Code)
    at java.lang.Thread.run(Thread.java, Compiled Code)