空ModelAndView返回到DispatcherServlet [英] Null ModelAndView returned to DispatcherServlet

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本文介绍了空ModelAndView返回到DispatcherServlet的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我试图使用Spring，Hibernate和Apache Tiles来运行我的Web应用程序。
看起来代码没有任何错误，但我只是得到一个404页面。



/var/log/tomcat7/catalina.out： p> 

  DEBUG：org.springframework.web.servlet.DispatcherServlet  - 成功配置Servlet'dispatcher'
 DEBUG：org.springframework。 web.servlet.DispatcherServlet  - 名为'dispatcher'的DispatcherServlet处理[/example/index.html]的GET请求
 DEBUG：org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping  - 查找处理程序方法for path /index.html 
 DEBUG：org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping  - 未找到[/index.html] 
的处理程序方法DEBUG：org.springframework。 web.servlet.handler.SimpleUrlHandlerMapping  - 请求[/index.html]的匹配模式为[/ **] 
 DEBUG：org.springframework.web.servlet.handler.SimpleUrlHandlerMapping  - 请求的URI模板变量[/ index .html]为{} 
 DEBUG：org.springframework。 web.servlet.handler.SimpleUrlHandlerMapping  - 使用处理函数[org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler@32645ccb]和1个拦截器
将[/index.html]映射到HandlerExecutionChain DEBUG：org.springframework.web.servlet .DispatcherServlet  -  [/example/index.html]的Last-Modified值为：-1 
 DEBUG：org.springframework.web.servlet.DispatcherServlet  - 空ModelAndView以名称'dispatcher'返回给DispatcherServlet：假设HandlerAdapter已完成请求处理
 DEBUG：org.springframework.web.servlet.DispatcherServlet  - 成功完成请求

Servlet： 

 < servlet> 
< servlet-name>调度程序< / servlet-name> 
< servlet-class> org.springframework.web.servlet.DispatcherServlet< / servlet-class> 
< init-param> 
< param-name> contextConfigLocation< / param-name> 
< param-value> classpath：/META-INF/spring/dispatcher-servlet.xml< / param-value> 
< / init-param> 
  1< / load-on-startup> 
< / servlet> 
 
< servlet-mapping> 
< servlet-name>调度程序< / servlet-name> 
< url-pattern> /< / url-pattern> 
< / servlet-mapping>

上下文：

 < mvc：annotation-driven /> 
< tx：annotation-driven /> 
 
< bean id =viewResolverclass =org.springframework.web.servlet.view.UrlBasedViewResolver> 
< property name =viewClassvalue =org.springframework.web.servlet.view.tiles2.TilesView/> 
< / bean> 
 
< bean id =tilesConfigurerclass =org.springframework.web.servlet.view.tiles2.TilesConfigurer> 
< property name =definitions> 
<值> 
 /WEB-INF/**/tiles.xml 
< /值> 
< / property> 
< / bean> 
 
< context：component-scan base-package =com.example.controller/> 
< resource mapping =/ resources / **location =/ resources //> 
< default-servlet-handler /> 
< context：property-placeholder location =classpath：jdbc.properties/> 
 
< bean id =dataSourceclass =org.apache.commons.dbcp.BasicDataSourcedestroy-method =close> 
< property name =driverClassNamevalue =$ {jdbc.driverClassName}/> 
< property name =urlvalue =$ {jdbc.url}/> 
< property name =usernamevalue =$ {jdbc.username}/> 
< property name =passwordvalue =$ {jdbc.password}/> 
< / bean> 
 
< bean id =sessionFactoryclass =org.springframework.orm.hibernate4.LocalSessionFactoryBean> 
< property name =dataSourceref =dataSource/> 
< property name =packagesToScanvalue =com.example.model/> 
< property name =hibernateProperties> 
<道具> 
< prop key =hibernate.dialect> $ {hibernate.dialect}< / prop> 
< prop key =hibernate.show_sql> $ {hibernate.show_sql}< / prop> 
< prop key =hibernate.generate_statistics> $ {hibernate.generate_statistics}< / prop> 
< /道具> 
< / property> 
< / bean> 
 
< bean id =transactionManagerclass =org.springframework.orm.hibernate4.HibernateTransactionManager> 
< property name =sessionFactoryref =sessionFactory/> 
< / bean>

Maven依赖： 

 <性状> 
< java.version> 1.6< /java.version> 
< spring.version> 3.1.1.RELEASE< /spring.version> 
< slf4j.version> 1.6.4< /slf4j.version> 
< / properties> 
 
<依赖关系> 
 
< dependency> 
< groupId> cglib< / groupId> 
< artifactId> cglib< / artifactId> 
< version> 2.2.2< / version> 
< /依赖关系> 
 
<！ -  Spring  - >> 
< dependency> 
< groupId> org.springframework< / groupId> 
< artifactId> spring-context< / artifactId> 
< version> $ {spring.version}< / version> 
<排除项> 
 <！ - 排除Commons记录SLF4j  - > 
<排除> 
< groupId> commons-logging< / groupId> 
< artifactId> commons-logging< / artifactId> 
< /排除> 
< /排除> 
< /依赖关系> 
< dependency> 
< groupId> org.springframework< / groupId> 
< artifactId> spring-orm< / artifactId> 
< version> $ {spring.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.springframework< / groupId> 
< artifactId> spring-tx< / artifactId> 
< version> $ {spring.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.springframework< / groupId> 
< artifactId> spring-webmvc< / artifactId> 
< version> $ {spring.version}< / version> 
< /依赖关系> 
 
<！ - 记录 - > 
< dependency> 
< groupId> org.slf4j< / groupId> 
< artifactId> slf4j-api< / artifactId> 
< version> $ {slf4j.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.slf4j< / groupId> 
< artifactId> jcl-over-slf4j< / artifactId> 
< version> $ {slf4j.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.slf4j< / groupId> 
< artifactId> slf4j-log4j12< / artifactId> 
< version> $ {slf4j.version}< / version> 
< scope>运行时< / scope> 
< /依赖关系> 
< dependency> 
< groupId> log4j< / groupId> 
< artifactId> log4j< / artifactId> 
< version> 1.2.17< / version> 
< scope>运行时< / scope> 
< /依赖关系> 
 
 <！ -  Hibernate  - > 
< dependency> 
< groupId> org.hibernate< / groupId> 
< artifactId> hibernate-core< / artifactId> 
< version> 4.1.1.Final< / version> 
< /依赖关系> 
< dependency> 
< groupId> postgresql< / groupId> 
< artifactId> postgresql< / artifactId> 
< version> 9.1-901-1.jdbc4< / version> 
< /依赖关系> 
 
<！ -  Servlet  - > 
< dependency> 
< groupId> javax.servlet< / groupId> 
< artifactId> servlet-api< / artifactId> 
< version> 2.5< / version> 
< scope>提供< / scope> 
< /依赖关系> 
< dependency> 
< groupId> javax.servlet< / groupId> 
< artifactId> jstl< / artifactId> 
< version> 1.2< / version> 
< /依赖关系> 
 
<！ -  Apache Tiles  - > 
< dependency> 
< groupId> org.apache.tiles< / groupId> 
< artifactId> tiles-jsp< / artifactId> 
< version> 2.2.2< / version> 
<排除项> 
 <！ - 排除Commons记录SLF4j  - > 
<排除> 
< groupId> commons-logging< / groupId> 
< artifactId> commons-logging-api< / artifactId> 
< /排除> 
< /排除> 
< /依赖关系> 
 
 <！ - 带Hibernate Validator的JSR 303  - > 
< dependency> 
< groupId> javax.validation< / groupId> 
< artifactId> validation-api< / artifactId> 
< version> 1.0.0.GA< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.hibernate< / groupId> 
< artifactId> hibernate-validator< / artifactId> 
< version> 4.1.0.Final< / version> 
< /依赖关系> 
 
< /依赖关系>

在添加所有的hibernate东西之前，我尝试了一下web应用程序，它工作得很好。但是没有数据库的Web应用程序是什么？



我已经花了数小时的时间找到问题了......



更新

控制器： 

  package com.example.controller; 
 
 import java.util.Map; 
 
 import org.springframework.stereotype.Controller; 
 import org.springframework.web.bind.annotation.RequestMapping; 
 
 @Controller 
 @RequestMapping（/）
 public class BlogController {
 @RequestMapping（/ index.html）
 public String posts （Map< String，Object> map）{
 returnposts; 
} 
}


解决方案

I解析它。

有两个上下文：根（应用程序范围）和servlet上下文
我定义了 viewResolver ， tilesConfigurer ， tx：注解驱动和 mvc：注释驱动

将它移到servlet上下文中解决了这个问题。



strong>已更新
我已移动 viewResolver ， tilesConfigurer ， tx：注释驱动和 mvc：注释驱动定义来自 applicationContext.xml 到 contextConfigLocation （ dispatcher-servlet.xml ）


I'm trying to run my web application using Spring, Hibernate and Apache Tiles. It seems the code has no errors, but I'm just getting a 404 page.

/var/log/tomcat7/catalina.out:

DEBUG: org.springframework.web.servlet.DispatcherServlet - Servlet 'dispatcher' configured successfully
DEBUG: org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'dispatcher' processing GET request for [/example/index.html]
DEBUG: org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Looking up handler method for path /index.html
DEBUG: org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping - Did not find handler method for [/index.html]
DEBUG: org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Matching patterns for request [/index.html] are [/**]
DEBUG: org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - URI Template variables for request [/index.html] are {}
DEBUG: org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapping [/index.html] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler@32645ccb] and 1 interceptor
DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/example/index.html] is: -1
DEBUG: org.springframework.web.servlet.DispatcherServlet - Null ModelAndView returned to DispatcherServlet with name 'dispatcher': assuming HandlerAdapter completed request handling
DEBUG: org.springframework.web.servlet.DispatcherServlet - Successfully completed request

Servlet:

<servlet>
    <servlet-name>dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:/META-INF/spring/dispatcher-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

context:

<mvc:annotation-driven />
<tx:annotation-driven />

<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.tiles2.TilesView" />
</bean>

<bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
    <property name="definitions">
        <value>
            /WEB-INF/**/tiles.xml
        </value>
    </property>
</bean>

<context:component-scan base-package="com.example.controller" />
<resources mapping="/resources/**" location="/resources/" />
<default-servlet-handler />
<context:property-placeholder location="classpath:jdbc.properties" />

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
    <property name="driverClassName" value="${jdbc.driverClassName}" />
    <property name="url" value="${jdbc.url}" />
    <property name="username" value="${jdbc.username}" />
    <property name="password" value="${jdbc.password}" />
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="packagesToScan" value="com.example.model" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
            <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
            <prop key="hibernate.generate_statistics">${hibernate.generate_statistics}</prop>
        </props>
    </property>
</bean>

<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

Maven dependencies:

<properties>
    <java.version>1.6</java.version>
    <spring.version>3.1.1.RELEASE</spring.version>
    <slf4j.version>1.6.4</slf4j.version>
</properties>

<dependencies>

    <dependency>
        <groupId>cglib</groupId>
        <artifactId>cglib</artifactId>
        <version>2.2.2</version>
    </dependency>

    <!-- Spring -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
        <exclusions>
            <!-- Exclude Commons Logging in favor of SLF4j -->
            <exclusion>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging</artifactId>
             </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- Logging -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>jcl-over-slf4j</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${slf4j.version}</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
        <scope>runtime</scope>
    </dependency>

    <!-- Hibernate -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.1.1.Final</version>
    </dependency>
    <dependency>
        <groupId>postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.1-901-1.jdbc4</version>
    </dependency>

    <!-- Servlet -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <!-- Apache Tiles -->
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-jsp</artifactId>
        <version>2.2.2</version>
        <exclusions>
            <!-- Exclude Commons Logging in favor of SLF4j -->
            <exclusion>
                <groupId>commons-logging</groupId>
                <artifactId>commons-logging-api</artifactId>
             </exclusion>
        </exclusions>
    </dependency>

    <!-- JSR 303 with Hibernate Validator -->
    <dependency>
        <groupId>javax.validation</groupId>
        <artifactId>validation-api</artifactId>
        <version>1.0.0.GA</version>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
        <version>4.1.0.Final</version>
    </dependency>

</dependencies>

Before adding all the hibernate stuff I tried the web app and it worked just great. But what's a webapp without a database?

I already spent hours on this and just can't find the problem...

UPDATE

Controller:

package com.example.controller;

import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/")
public class BlogController {
    @RequestMapping("/index.html")
    public String posts(Map<String, Object> map) {
        return "posts";
    }
}

解决方案

I solved it.

There are two contexts: root (application wide) and servlet context I defined viewResolver, tilesConfigurer, tx:annotation-driven and mvc:annotation-driven in the root context.

Moving it to the servlet context solved the problem.

UPDATED I've moved viewResolver, tilesConfigurer, tx:annotation-driven and mvc:annotation-driven definitions from applicationContext.xml to contextConfigLocation (dispatcher-servlet.xml)

这篇关于空ModelAndView返回到DispatcherServlet的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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