java中奇葩异常一

骑猪看日落 2022-10-01 04:46 159阅读 0赞

java.lang.Exception: No tests found matching \[\{ExactMatcher:fDisplayName=testFindUserByQueryVo\], \{ExactMatcher:fDisplayName=testFindUserByQueryVo(com.baidu.test.UserMapperTest)\], \{LeadingIdentifierMatcher:fClassName=com.baidu.test.UserMapperTest,fLeadingIdentifier=testFindUserByQueryVo\]\] from org.junit.internal.requests.ClassRequest@1de0aca6  
at org.junit.internal.requests.FilterRequest.getRunner(FilterRequest.java:40)  
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createFilteredTest(JUnit4TestLoader.java:77)  
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:68)  
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:43)  
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:444)  
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)  
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)  
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

如上所示：是在项目开发中进行JUnit4测试时，抛出的奇葩异常。以前看到No tests found 时都是没有写关键字造成的，这次不一样。

这次不一样，关键字也写了，还一直抛出这个异常。下面是源码；

import java.io.IOException;  
import java.io.InputStream;  
import java.util.List;  
  
  
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 org.junit.Before;  
import org.junit.Test;  
  
  
import com.baidu.mapper.UserMapper;  
import com.baidu.po.QueryVo;  
import com.baidu.po.User;  
  
  
public class UserMapperTest \{  
private SqlSessionFactory sqlSessionFactory;  
  
@Before  
private void init() throws IOException \{  
SqlSessionFactoryBuilder sessionFactoryBuilder = new SqlSessionFactoryBuilder();  
InputStream resourceAsStream = Resources.getResourceAsStream("SqlMapConfig.xml");  
this.sqlSessionFactory = sessionFactoryBuilder.build(resourceAsStream);  
\}  
  
@Test  
public void testFindUserByQueryVo() \{  
SqlSession sqlSession = this.sqlSessionFactory.openSession();  
//获取代理对象  
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);  
User user = new User();  
user.setUsername("张");  
QueryVo queryVo = new QueryVo();  
queryVo.setUser(user);  
List<User> list = userMapper.findUserByQueryVo(queryVo);  
for (User user2 : list) \{  
System.out.println(user2);  
\}  
sqlSession.close();  
\}  
  
@Test  
public void testFindUserCount()\{  
SqlSession sqlSession = this.sqlSessionFactory.openSession();  
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);  
User user = new User();  
user.setUsername("管理员");  
int count = userMapper.findUserCount(user);  
System.out.println(count);  
  
sqlSession.close();  
\}  
  
@Test  
public void testFindUserList()\{  
SqlSession sqlSession = this.sqlSessionFactory.openSession();  
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);  
User user = new User();  
user.setUsername("张");  
List<User> list = userMapper.findUserList(user);  
System.out.println(list);  
  
sqlSession.close();  
\}  
\}

异常的意思是，没有找到测试。开始自己一直没有找出来，后来经过前辈的帮助，才发现问题所在。代码里面的init方法是使用快捷键生成的，

导致方法的默认权限修饰符为private；问题就出在这里，测试用例中的所有测试方法都必须有三点要求：1.方法无参数；2.方法无返回值；3.方法的权限为public;