Spring @ Autowired injection is fine, while @ Resource injection is null - Codes Helper

recently set up a ssm project of my own. I used to use @ Autowired to try @ Resource this time. However, injection always fails when using resource, no error is reported at startup, and null pointer exception is reported at run time.

error
java.lang.NullPointerException
at TestMyBatis.test3 (TestMyBatis.java:43)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (NativeMethod)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke (Method.java:564)
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.InvokeMethod.evaluate (InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate (RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks Br (RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate (SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf (ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild (SpringJUnit4ClassRunner.java:252)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild (SpringJUnit4ClassRunner.java:94)
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$2.evaluate (ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate (RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate (RunAfterTestClassCallbacks.) Java:70)
at org.junit.runners.ParentRunner.run (ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run (SpringJUnit4ClassRunner.java:191)
at org.junit.runner.JUnitCore.run (JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs (JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$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)

< hr >

configuration file

< beans xmlns= "http://www.springframework.org/schema/beans" xmlns:context=" http://www.springframework.org/schema/context" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns:aop=" http://www.springframework.org/schema/aop"

   xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
   xmlns:cache="http://www.springframework.org/schema/cache"
   xsi:schemaLocation="
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">

<!--  -->
<context:component-scan base-package="com.mineblog"></context:component-scan>

<!-- properties:${url} -->
<context:property-placeholder location="classpath:jdbc.properties"/>

<!--  -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="${jdbc.driverClassName}"/>
    <property name="url" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
    <property name="initialSize" value="${jdbc.initialSize}"/>
    <property name="maxActive" value="${jdbc.maxActive}"/>
    <property name="maxIdle" value="${jdbc.maxIdle}"/>
    <property name="minIdle" value="${jdbc.minIdle}"/>
    <property name="maxWait" value="${jdbc.maxWait}"/>
    <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
</bean>

<!-- SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!--  -->
    <property name="dataSource" ref="dataSource" />
    <!-- model  -->
    <property name="typeAliasesPackage" value="com.mineblog.pojo"/>
    <!-- mapping.xml -->
    <property name="mapperLocations" value="classpath:mapper/**/*.xml"></property>
</bean>



<!-- DaoDaospring -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- sqlSessionFactory -->
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    <!-- Dao -->
    <property name="basePackage" value="com.mineblog.dao"/>
</bean>

<!--  -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <!--  -->
    <property name="dataSource" ref="dataSource"/>
</bean>

<!-- @Transactional -->
<tx:annotation-driven transaction-manager="transactionManager"/>

<aop:aspectj-autoproxy />

< / beans >

< hr >

< 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/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">


<context:annotation-config/>

<!-- webbean -->
<context:component-scan base-package="com.mineblog"/>

<!-- SpringMVC -->
<mvc:annotation-driven/>

<!-- servlet -->
<mvc:default-servlet-handler/>

<!-- jsp ViewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>

< / beans >

< hr >

Application 2.3//EN"  "http://java.sun.com/dtd/web-app_2_3.dtd" >

<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>Archetype Created Web Application</display-name>

  <!--  -->   <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>   </filter>   <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>   </filter-mapping>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-mybatis.xml</param-value>   </context-param>


  <!-- DispatcherServlet -->   <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- springMVC-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-*.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>   </servlet>   <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- -->
    <url-pattern>/</url-pattern>   </servlet-mapping>


  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>   </welcome-file-list> </web-app>

< hr >