Question

I am trying read value defined in jsp file SendSms.jsp in SmsServlet. I am getting below error. If I run without request.getParameter() it will work. Below is the error am getting

type Exception report

message

description The server encountered an
internal error () that prevented it
from fulfilling this request.

exception

java.lang.NullPointerException
java.util.Hashtable.get(Hashtable.java:336)
org.apache.tomcat.util.http.Parameters.getParameterValues(Parameters.java:192)
org.apache.tomcat.util.http.Parameters.getParameter(Parameters.java:237)
org.apache.catalina.connector.Request.getParameter(Request.java:1000)
org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:352)
org.netbeans.modules.web.monitor.server.MonitorRequestWrapper.getParameter(MonitorRequestWrapper.java:182)
SmsServlet.processRequest(SmsServlet.java:31)
SmsServlet.doGet(SmsServlet.java:160)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)

Thanks.

My JSP Code..

<form action="SmsServlet" method="get">
            Mobile No. : <input type ="text" name="phone"/><br><br>
            Message : <textarea name="msg" rows="5"></textarea><br>
            <input type="submit" value="Send"/>
        </form>

My Servlet code..

        String phone = null;
        String msg = null;
        phone = request.getParameter(phone);

Answer 1

Because

request.getParameter()

returns null

It means your request doesn’t contain the param you are trying to read. probably issue with html id/name double check it