SimpleFormController Issue in Java

Question

I need to know about as shown below error :

SEVERE: Servlet.service() for servlet dispatcher threw exception
java.lang.IllegalStateException: Cannot create command without commandClass being set - either set commandClass or (in a form controller) override formBackingObject
    at org.springframework.web.servlet.mvc.BaseCommandController.createCommand(BaseCommandController.java:361)
    at org.springframework.web.servlet.mvc.AbstractFormController.formBackingObject(AbstractFormController.java:481)
    at org.springframework.web.servlet.mvc.AbstractFormController.getErrorsForNewForm(AbstractFormController.java:361)
    at org.springframework.web.servlet.mvc.AbstractFormController.showNewForm(AbstractFormController.java:341)
    at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:281)
    at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:746)
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:716)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:65)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)

What i am doing is default page is index.jsp in this page forward to another page.Here getting error.Please find the below code :

MainController.java

package com.ht.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

public class MainController extends SimpleFormController  {


    @Override
    protected ModelAndView onSubmit(HttpServletRequest request,
            HttpServletResponse response, Object command, BindException errors)
            throws Exception {

        System.out.println("**************  onSubmit ************************");

         String msg=null;

             msg="Registration success";

        return  new ModelAndView("result","resMsg",msg);
    }


}

dispatcher-servlet.xml

<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
                                       http://www.springframework.org/schema/beans/spring-beans.xsd">

 <bean id="sic"  class="com.ht.controller.MainController"/>


 <bean id="suhm"  class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
     <property name="mappings">
        <props>
           <prop key="main.htm">sic</prop>

        </props>
     </property>
   </bean> 

    <bean id="vr"  class="org.springframework.web.servlet.view.InternalResourceViewResolver">
       <property name="prefix" value="/WEB-INF/jsp/"/>
       <property name="suffix" value=".jsp"/>
    </bean>

</beans>                                                

index.jsp

<jsp:forward page="main.htm"/>

main.jsp

<form:form method="post">
  Student no:<form:input path="sno"/><br>
  Student name :<form:input path="sname"/><br>
  Student address :<form:input path="sadd"/><br>
  <input type="submit" value="register"/>
</form:form>

I didn't get any idea about this.So please suggest me what to do for this error.

Answer 1

You need to inject those class while create bean instance

<bean id="sic" class="com.ht.controller.MainController"> <property name="commandClass" value="You class Package"/> <property name="commandName" value="name of command"/> </bean>