Could not initialize class com.imooc.mybatis.utils.MyBatisUtils
问题描述：之前执行测试类还可以，现在就保这个错误
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <!-- goods_id ==> goodsId 驼峰命名转换 --> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> <!--启用Pagehelper分页插件--> <plugins> <plugin interceptor="com.github.pagehelper.PageInterceptor"> <!--设置数据库类型--> <property name="helperDialect" value="mysql"/> <!--分页合理化--> <property name="reasonable" value="true"/> </plugin> </plugins> <!--设置默认指向的数据库--> <environments default="dev"> <!--配置环境，不同的环境不同的id名字--> <environment id="dev"> <!-- 采用JDBC方式对数据库事务进行commit/rollback --> <transactionManager type="JDBC"></transactionManager> <!--采用连接池方式管理数据库连接--> <!--<dataSource type="POOLED">--> <dataSource type="com.imooc.mybatis.datasource.C3P0DataSourceFactory"> <property name="driverClass" value="com.mysql.jdbc.Driver"/> <property name="jdbcUrl" value="jdbc:mysql://192.168.0.102:3306/babytun?useUnicode=true&characterEncoding=UTF-8"/> <property name="user" value="root"/> <property name="password" value="root"/> <property name="initialPoolSize" value="5"/> <property name="maxPoolSize" value="20"/> <property name="minPoolSize" value="5"/> <!--...--> </dataSource> </environment> <environment id="prd"> <!-- 采用JDBC方式对数据库事务进行commit/rollback --> <transactionManager type="JDBC"></transactionManager> <!--采用连接池方式管理数据库连接--> <dataSource type="POOLED"> <property name="driver" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://192.168.1.155:3306/babytun?useUnicode=true&characterEncoding=UTF-8"/> <property name="username" value="root"/> <property name="password" value="root"/> </dataSource> </environment> </environments> <mappers> <mapper resource="mappers/goods.xml"/> <mapper resource="mappers/goods_detail.xml"/> </mappers> </configuration>
MyBatisUtils
package com.imooc.mybatis.utils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.Reader;
public class MyBatisUtils {
private 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 session){
if(session !=null){
session.close();
}
}
}goods.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="goods">
<select id="selectAll" resultType="com.imooc.mybatis.entity.Goods">
select * from t_goods order by goods_id desc limit 10
</select>
<select id="selectById" parameterType="Integer" resultType="com.imooc.mybatis.entity.Goods">
select * from t_goods where goods_id = #{value}
</select>
</mapper>搜索
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好帮手慕小小
2022-03-15 10:39:42
同学你好，已上传的代码中未发现问题呢。出现如下这个错误多数是配置文件中存在问题。可检查下配置文件mybatis-config.xml、goods_detail.xml、goods.xml中是否存在问题，例如参数类型书写错误等。
根据报错提示，在MybatisUtilsTestor类的84行报错，如：
也就是调用closeSession()方法关闭sqlSession对象这里，同学可将其注释掉，查看不关闭session时会报什么错误，在根据报错进行代码修正。
祝学习愉快~
-
凉茶趁热喝 #1
不关闭session时会报这个错误
"C:\Program Files\Java\jdk1.8.0_221\bin\java.exe" -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\JetBrains\IntelliJ IDEA 2021.1.3\lib\idea_rt.jar=49749:D:\JetBrains\IntelliJ IDEA 2021.1.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\JetBrains\IntelliJ IDEA 2021.1.3\lib\idea_rt.jar;D:\JetBrains\IntelliJ IDEA 2021.1.3\plugins\junit\lib\junit5-rt.jar;D:\JetBrains\IntelliJ IDEA 2021.1.3\plugins\junit\lib\junit-rt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_221\jre\lib\rt.jar;D:\IDEAjava\imooc\com.imooc.mybatis\target\test-classes;D:\IDEAjava\imooc\com.imooc.mybatis\target\classes;C:\Users\85428\.m2\repository\org\mybatis\mybatis\3.5.1\mybatis-3.5.1.jar;C:\Users\85428\.m2\repository\mysql\mysql-connector-java\5.1.47\mysql-connector-java-5.1.47.jar;C:\Users\85428\.m2\repository\junit\junit\4.12\junit-4.12.jar;C:\Users\85428\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.imooc.mybatis.MybatisTestor,testSelectById java.lang.ExceptionInInitializerError at com.imooc.mybatis.MybatisTestor.testSelectById(MybatisTestor.java:78) 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:221) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54) Caused by: org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession. ### The error may exist in SQL Mapper Configuration ### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.github.pagehelper.PageInterceptor'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.github.pagehelper.PageInterceptor at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:52) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:36) at com.imooc.mybatis.utils.MyBatisUtils.<clinit>(MyBatisUtils.java:18) ... 23 more Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.github.pagehelper.PageInterceptor'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.github.pagehelper.PageInterceptor at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:121) at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:98) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:50) ... 25 more Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.github.pagehelper.PageInterceptor'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.github.pagehelper.PageInterceptor at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:118) at org.apache.ibatis.builder.xml.XMLConfigBuilder.pluginElement(XMLConfigBuilder.java:188) at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:110) ... 27 more Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.github.pagehelper.PageInterceptor'. Cause: java.lang.ClassNotFoundException: Cannot find class: com.github.pagehelper.PageInterceptor at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:120) at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149) at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116) ... 29 more Caused by: java.lang.ClassNotFoundException: Cannot find class: com.github.pagehelper.PageInterceptor at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:200) at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89) at org.apache.ibatis.io.Resources.classForName(Resources.java:261) at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:116) ... 31 more Process finished with exit code -1
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2022-03-15 20:43:17 -
同学你好，根据报错信息提示可知配置文件中引入了分页插件，但却未成功导入相关依赖导致的。若未使用到分页则可先将其注释掉。
也可在pom.xml引入入相关依赖：
<dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.1.10</version> </dependency> <dependency> <groupId>com.github.jsqlparser</groupId> <artifactId>jsqlparser</artifactId> <version>2.0</version> </dependency>
相关课程：PageHelper分页插件
祝学习愉快~
2022-03-16 10:09:17
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