java - Two very similar SpringMVC projects. One fails to display model data -

i've made 2 projects, both basic spring mvc basic configurations , single controller. of files in both projects identical controller, view , view-resolver definition. done purpose of finding causing failure: in projecta view fails display model data sent controller. projectb works fine. (i using spring 4.3.9 , tomcat 8.5.20)

project a - dispatcher servlet defined extending abstractannotationconfigdispatcherservletinitializer. getrootconfigclasses() returns config class links web-config.xml define view resolver.

├── pom.xml └── src     └── main         ├── java         │   └── mywebapp         │       ├── config         │       │   ├── mywebappinitializer.java         │       │   └── rootconfig.java         │       └── web         │           └── homecontroller.java         ├── resources         │   └── web-config.xml         └── webapp             └── web-inf                 ├── views                 │   └── home.jsp                 └── web.xml 

project b - dispatcher defined in web.xml. servlet-context , root-context linked in web.xml.

├── pom.xml └── src     └── main         ├── java         │   └── mywebapp         │       └── web         │           └── homecontroller.java         ├── resources         │   ├── app-config.xml         │   └── web-config.xml         └── webapp             └── web-inf                 ├── views                 │   └── home.jsp                 └── web.xml 

project a returns

hello world!  ${message}  ${message} 

project b returns

hello world!  message in model  message in model 

since both projects use identical:

a) jsp view. b) controller said view. c) config file defining view resolver.(web-config.xml)

and root-context files (app-config.xml , rootconfig.java) serve links between servlet-context files , dispatcher definition, cause of failure must come java-config of dispatcher servlet. can't find it.

mywebappinitializer.java project a

package mywebapp.config;  import org.springframework.web.servlet.support.abstractannotationconfigdispatcherservletinitializer;  public class mywebappinitializer extends abstractannotationconfigdispatcherservletinitializer {      @override     protected string[] getservletmappings() {         return new string[] { "/" };     }      @override     protected class<?>[] getrootconfigclasses() {         return new class<?>[] { rootconfig.class };     }      @override     protected class<?>[] getservletconfigclasses() {         return null;     } } 

web.xml project b

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"          xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"          xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee                              http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1">      <display-name>spring mvc xml configuration example</display-name>      <context-param>         <param-name>contextconfiglocation</param-name>         <param-value>classpath:app-config.xml</param-value>     </context-param>      <listener>         <listener-class>org.springframework.web.context.contextloaderlistener</listener-class>     </listener>      <servlet>         <servlet-name>my-dispatcher-servlet</servlet-name>         <servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class>         <init-param>             <param-name>contextconfiglocation</param-name>             <param-value>classpath:web-config.xml</param-value>         </init-param>         <load-on-startup>1</load-on-startup>     </servlet>      <servlet-mapping>         <servlet-name>my-dispatcher-servlet</servlet-name>         <url-pattern>/</url-pattern>     </servlet-mapping>  </web-app> 

web-config.xml - shared both projects

<beans xmlns="http://www.springframework.org/schema/beans"        xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"        xmlns:context="http://www.springframework.org/schema/context"        xmlns:mvc="http://www.springframework.org/schema/mvc"        xsi:schemalocation="             http://www.springframework.org/schema/beans                         http://www.springframework.org/schema/beans/spring-beans.xsd                         http://www.springframework.org/schema/mvc                         http://www.springframework.org/schema/mvc/spring-mvc.xsd                         http://www.springframework.org/schema/context                         http://www.springframework.org/schema/context/spring-context.xsd ">      <context:component-scan base-package="mywebapp.web" />      <mvc:annotation-driven />      <bean class="org.springframework.web.servlet.view.internalresourceviewresolver">         <property name="viewclass" value="org.springframework.web.servlet.view.jstlview"/>         <property name="prefix" value="/web-inf/views/" />         <property name="suffix" value=".jsp" />     </bean>  </beans> 

homecontroller.java - shared both projects

package mywebapp.web;  import org.springframework.stereotype.controller; import org.springframework.ui.modelmap; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestmethod;  @controller public class homecontroller {      @requestmapping(value = "/", method = requestmethod.get)     public string index(modelmap model){         model.addattribute("message", "my message in model");         return "home";     }  } 

please me find cause failure display model data can have working java-config template.

rootconfig.java project a

package mywebapp.config;  import org.springframework.context.annotation.bean; import org.springframework.context.annotation.componentscan; import org.springframework.context.annotation.componentscan.filter; import org.springframework.context.annotation.configuration; import org.springframework.context.annotation.filtertype; import org.springframework.web.servlet.config.annotation.enablewebmvc; import org.springframework.context.annotation.importresource;  import java.util.list;  @configuration @componentscan (basepackages={"mywebapp"}, excludefilters={@filter(type=filtertype.annotation, value=enablewebmvc.class)}) @importresource("classpath:web-config.xml") public class rootconfig { } 

step 1) in project a - delete web.xml created maven archetype.

step 2) add following pom.xml

<build>     <plugins>         <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-war-plugin</artifactid>             <version>3.0.0</version>         </plugin>     </plugins> </build>