Could not find @PathVariable [pathVars] in @RequestMapping Spring MVC
I am just new to spring MVC, the following is my code. When I try to navigate to bye
I get the following error
Could not find @PathVariable [pathVars] in @RequestMapping Spring MVC
Below is my code
package com.springapp.mvc;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import java.util.Map;
@Controller
public class HelloController {
@RequestMapping("/")
public String printWelcome(ModelMap model) {
model.addAttribute("message", "Hello world!");
return "hello";
}
@RequestMapping("/runThis/{bye}/{hye}")
public ModelAndView printBye(@PathVariable Map<String,String> pathVars) {
String Bye = pathVars.get("bye");
String Hye = pathVars.get("hye");
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("message", "you are"+Bye+ "AND Here COmes" +Hye+"!");
return modelAndView;
}
}
EDIT full stack.
type Exception report
message Request processing failed; nested exception is org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.springapp.mvc.HelloController.printBye(java.util.Map)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.springapp.mvc.HelloController.printBye(java.util.Map)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
root cause
org.springframework.web.bind.annotation.support.HandlerMethodInvocationException: Failed to invoke handler method [public org.springframework.web.servlet.ModelAndView com.springapp.mvc.HelloController.printBye(java.util.Map)]; nested exception is java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:180)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
root cause
java.lang.IllegalStateException: Could not find @PathVariable [pathVars] in @RequestMapping
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter$ServletHandlerMethodInvoker.resolvePathVariable(AnnotationMethodHandlerAdapter.java:859)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolvePathVariable(HandlerMethodInvoker.java:710)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:359)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:170)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:446)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:434)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.43 logs.
+1
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4 answers
you need <mvc:annotation-driven/>
in your configurator-servlet-dispatcher xml
or in more recent spring use
@EnableWebMvc
annotation in your spring config class
and please understand that @EnableWebMvc is created to replace mvc: annotation-driven
and make sure the xmlns are correct in
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
+7
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Instead, in your code:
public ModelAndView printBye(@PathVariable Map<String,String> pathVars) {
Change it like this:
public ModelAndView printBye(@RequestParam Map<String,String> pathVars) {
This is because @RequestParam is used to process the Map object passed to the parameter, and @PathVariable is used to process the individual items passed to the parameter. Here's an example @PathVariable:
public ModelAndView printBye(@PathVariable("bye") String Bye, @PathVariable("hye") String Hye) {
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When matching requests, you specify that your URL has a fixed part /runThis/
and two variable parts {bye}
and {hye}
that you want them to be mapped to two parameters of your method (with matching names as you do not specify anything).
But in your method, you declare a single parameter with a name pathVars
. So you have a mismatch in names, types and number of parameters. This is what Spring MVC is complaining about.
So you want:
@RequestMapping("/runThis/{bye}/{hye}")
public ModelAndView printBye(@PathVariable String bye, @PathVariable String hye) {
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("message", "you are" + bye + "AND Here COmes" + hye + "!");
return modelAndView;
}
It's even easier and safer than your code. And please read the documentation. This is a very simple example.
0
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