找了一天没见错误

D:\Java\jdk\bin\java.exe -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:59852,suspend=y,server=n -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:C:\Users\liujia\AppData\Local\JetBrains\IntelliJIdea2020.2\captureAgent\debugger-agent.jar -Dfile.encoding=UTF-8 -classpath "C:\Program Files\JetBrains\IntelliJ IDEA 2020.2.1\lib\idea_rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2020.2.1\plugins\junit\lib\junit5-rt.jar;C:\Program Files\JetBrains\IntelliJ IDEA 2020.2.1\plugins\junit\lib\junit-rt.jar;D:\java\jdk\jre\lib\charsets.jar;D:\java\jdk\jre\lib\deploy.jar;D:\java\jdk\jre\lib\ext\access-bridge-64.jar;D:\java\jdk\jre\lib\ext\cldrdata.jar;D:\java\jdk\jre\lib\ext\dnsns.jar;D:\java\jdk\jre\lib\ext\jaccess.jar;D:\java\jdk\jre\lib\ext\jfxrt.jar;D:\java\jdk\jre\lib\ext\localedata.jar;D:\java\jdk\jre\lib\ext\nashorn.jar;D:\java\jdk\jre\lib\ext\sunec.jar;D:\java\jdk\jre\lib\ext\sunjce_provider.jar;D:\java\jdk\jre\lib\ext\sunmscapi.jar;D:\java\jdk\jre\lib\ext\sunpkcs11.jar;D:\java\jdk\jre\lib\ext\zipfs.jar;D:\java\jdk\jre\lib\javaws.jar;D:\java\jdk\jre\lib\jce.jar;D:\java\jdk\jre\lib\jfr.jar;D:\java\jdk\jre\lib\jfxswt.jar;D:\java\jdk\jre\lib\jsse.jar;D:\java\jdk\jre\lib\management-agent.jar;D:\java\jdk\jre\lib\plugin.jar;D:\java\jdk\jre\lib\resources.jar;D:\java\jdk\jre\lib\rt.jar;D:\IdeaTest\test\target\test-classes;D:\IdeaTest\test\target\classes;D:\java\.m2\repository\org\mybatis\mybatis\3.5.5\mybatis-3.5.5.jar;D:\java\.m2\repository\mysql\mysql-connector-java\5.1.47\mysql-connector-java-5.1.47.jar;D:\java\.m2\repository\junit\junit\4.12\junit-4.12.jar;D:\java\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.mybatis.test.testMybatis,testConnection

Connected to the target VM, address: '127.0.0.1:59852', transport: 'socket'

java.lang.NoClassDefFoundError: Could not initialize class com.mybatis.jutils.TestJutils

at com.mybatis.test.testMybatis.testConnection(testMybatis.java:25)

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.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

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.junit.runners.ParentRunner.run(ParentRunner.java:363)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)

at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)

at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)

at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)

Disconnected from the target VM, address: '127.0.0.1:59852', transport: 'socket'

Process finished with exit code -1

package com.mybatis.jutils;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.Reader;


public class MybatisJuntils {
   public static SqlSessionFactory sqlSessionFactory =null;
   static {
       Reader reader=null;
       try {
          reader= Resources.getResourceAsReader("mybatis.config.xml");
           sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
       } catch (IOException e) {
           e.printStackTrace();
           throw new ExceptionInInitializerError(e);
       }

   }
   public static SqlSession openSession(){
       return sqlSessionFactory.openSession();
   }
   public static void closeSession(SqlSession sqlSession){
       if (sqlSession!=null){
           sqlSession.close();
       }
   }
}