java.lang.IllegalArgumentException: WebApplicationContext is required

 

问题：

先列出来代码，这是一个测试代码，用来测试分页功能是否可以成功查询到后台数据：

package com.atguigu;

import com.atguigu.crud.bean.Employee;
import com.github.pagehelper.PageInfo;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockHttpServletRequest;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;

import java.util.List;

/**
 * 使用Spring测试模块提供的测试请求功能，测试curd的正确性
 */

@RunWith(SpringJUnit4ClassRunner.class)

@WebAppConfiguration
@ContextConfiguration(locations = {"classpath:applicationContext.xml","classpath:dispatcherServlet.xml"})
public class MvcTest {
    //传入SpringMVC的ioc
    WebApplicationContext context;
    //虚拟mvc请求，获取到处理结果。
    MockMvc mockMvc;
    @Before
    public void initMokcMvc(){
        mockMvc=MockMvcBuilders.webAppContextSetup(context).build();
    }
    @Test
    public void testPage() throws Exception {
        //模拟请求拿到返回值
        MvcResult result=mockMvc.perform(MockMvcRequestBuilders.get("/emps").param("pn","1")).andReturn();
        //请求成功以后，请求域中会有pageInfo；我们取出pageInfo进行验证
        MockHttpServletRequest request = result.getRequest();
        PageInfo pi= (PageInfo) request.getAttribute("pageInfo");
        System.out.println("当前页面："+pi.getPageNum());
        System.out.println("总页码："+pi.getPages());
        System.out.println("总记录数："+pi.getTotal());
        System.out.println("在页面需要连续显示的页码");
        int[] nums=pi.getNavigatepageNums();
        for (int i :nums) {
            System.out.print(" "+i);
        }
        //获取员工数据
        List list =pi.getList();
        for(Employee employee:list){
            System.out.println("ID:"+employee.getEmpId()+"==>name:"+employee.getEmpName());
        }
    }
}

在运行的时候，就报了这个错误 

java.lang.IllegalArgumentException: WebApplicationContext is required

	at org.springframework.util.Assert.notNull(Assert.java:134)
	at org.springframework.test.web.servlet.setup.DefaultMockMvcBuilder.(DefaultMockMvcBuilder.java:52)
	at org.springframework.test.web.servlet.setup.MockMvcBuilders.webAppContextSetup(MockMvcBuilders.java:47)
	at com.atguigu.MvcTest.initMokcMvc(MvcTest.java:36)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:85)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:86)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:241)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:87)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

解决方法：

直接百度报的错误，说是需要加入下面的注解

@WebAppConfiguration

可是我的代码已经有了这个注解，还是报了错，也有说的别的解决方案，都试了一遍，全都没有解决。

 

把这个放了一天，今天又回过头来看。

Debug了一下，跟踪到异常的地方，异常的抛出是因为下边的这个context变量是空值，导致了34行跑出了异常！！！

WebApplicationContext context;

=-=结果发现自己下边的这个变量没有给@Autowired注解，佛了。加上注解，跑一下，就跑通了。后来查了下@Autowired注解，这个注解可以对类成员变量、方法及构造函数进行标注，完成自动装配的工作，想来在下是。

   @Autowired
    WebApplicationContext context;