error with implementing a basic struts example

[sandeep raj]

I am trying to implement a simple struts example but am getting a few errors when trying to call the action servlet .

My input html page has the following

 <form action="controllerServlet.do" method="POST">

Enter the name: <input type="text" name="id"/><br>

<input type="SUBMIT" />   

The form bean for this html is

  public class InputFormBean extends ActionForm{
	
	
	private String id;
	
	public void setId(String id)
	{
		this.id=id;
	}
	
	public String getId()
	{
		return id;
	}
	
	
	public ActionErrors validate(ActionMapping mapping,HttpServletRequest request)
	{
		ActionErrors errors = new ActionErrors();
		
		if(request.getParameter("id").isEmpty())
			errors.add("id", new ActionMessage("id invalid"));
		return errors;
		
	}  

while my action object class is as follows

  public class StrutsActionObject extends Action {
	
	public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
	{
		  InputFormBean myForm = (InputFormBean)form;
		  Person p = new Person();
		  int randomNum = p.calculate();
		  
		  request.setAttribute("num2",randomNum);
		  request.setAttribute("id", myForm.getId());
		  
		  return mapping.findForward("show_results");
		  
	}

}  

The web.xml file has the following mapping

  <servlet>
		<servlet-name>FrontController</servlet-name>
		<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
		<init-param>
			<param-name>config</param-name>
			<param-value>/WEB-INF/struts-config.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>FrontController</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>  

and the struts-config.xml file has the following

   
<struts-config>

  	<form-beans>
		<form-bean name="x1" type="com.example.web.InputFormBean" />
	</form-beans>

	<action-mappings>
		<action path="/ControllerServlet" type="com.example.web.StrutsActionObject" name="x1" scope="request" validate="true" input="/display.jsp">
		
		<forward name="show_results" path="/display.jsp" />
		</action>
		
	</action-mappings>
	
</struts-config>

display.jsp is just a jsp page which calls the attributes i saved in the action object and displays them

I am able to launch tomcat but when i click the submit button of the html page i.e request the action servlet i get the following exception

    WARNING: Unhandled exception
org.apache.struts.chain.commands.InvalidPathException: No action config found for the specified url.
	at org.apache.struts.chain.commands.AbstractSelectAction.execute(AbstractSelectAction.java:71)
	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)
Mar 12, 2009 2:56:06 PM org.apache.struts.chain.commands.ExceptionCatcher postprocess
WARNING: Exception from exceptionCommand 'servlet-exception'
org.apache.struts.chain.commands.InvalidPathException: No action config found for the specified url.
	at org.apache.struts.chain.commands.AbstractSelectAction.execute(AbstractSelectAction.java:71)
	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)
Mar 12, 2009 2:56:06 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet FrontController threw exception
org.apache.struts.chain.commands.InvalidPathException: No action config found for the specified url.
	at org.apache.struts.chain.commands.AbstractSelectAction.execute(AbstractSelectAction.java:71)
	at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
	at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
	at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

can anyone help me figure out what i am doing wrong

[David Newton]

Are you deploying to the root context? Can you access the action directly? (Calling an action "controllerServlet" is *really* misleading, since it's neither the controller, nor a servlet, btw.)

Also, there's no reason to validate against the request parameter directly in validate(); that somewhat defeats the purpose of having the ActionForm. I'd also recommend using the Struts HTML tags to implement the form, but that's a separate issue.

[sandeep raj]

thanks david.. this was actually my first trial of implementing a struts example so i was more focused on getting it to work .. thanks for the input though.. i figured out the mistake btw .. i made the blunder of spelling the controller servlet action in the action mapping of struts-config.xml with a capital 'C'

[David Newton]

Ah, ha--didn't catch that--good one! :)