MybatisPlus BaseMapper 中的方法全部 Invalid bound state

错误梗概

接手了一个新任务，需要修改别人的代码。看看数据库配置 ，连连接池都没，然后引入了 druid，本来一切很顺利。后来不知道怎么回事，运行起来后总是报 “Invalid bound statement (not found) ”，而且报错的都是 MybatisPlus 生成的 BaseMapper 中的方法，自己写的都能正常运行。

参考了很多其他帖子，都无果，最后弄了很久，终于搞定了，特级录之。

druid 和 mybatis-plus 配置参数如下：

pom.xml

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid-spring-boot-starter</artifactId>
  <version>1.1.10</version>
 </dependency>

 <dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>mybatis-plus-boot-starter</artifactId>
  <version>3.2.0</version>
 </dependency>

 <dependency>
  <groupId>com.github.pagehelper</groupId>
  <artifactId>pagehelper-spring-boot-starter</artifactId>
  <version>1.2.13</version>
  <exclusions>
  <exclusion>
   <artifactId>jsqlparser</artifactId>
   <groupId>com.github.jsqlparser</groupId>
  </exclusion>
  <exclusion>
   <artifactId>mybatis-spring</artifactId>
   <groupId>org.mybatis</groupId>
  </exclusion>
  </exclusions>
 </dependency>

application.properties

######################################################### MybatisPlus 配置
mybatis-plus.mapper-locations=classpath:mapper/*.xml
mybatis-plus.type-aliases-package=com.yishi.entity
mybatis-plus.global-config.db-config.table-underline=true
mybatis-plus.global-config.banner=false
mybatis-plus.configuration.map-underscore-to-camel-case=true
mybatis-plus.configuration.jdbc-type-for-null=NULL
mybatis-plus.configuration.auto-mapping-behavior=FULL
######################################################### druid 配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
# 参考 https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter
#################################### JDBC 配置
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.druid.url=${mysql.url}
spring.datasource.druid.username=${mysql.username}
spring.datasource.druid.password=${mysql.password}
#################################### 连接池配置
# 初始化大小，最小，最大
spring.datasource.druid.initial-size=10
spring.datasource.druid.max-active=500
spring.datasource.druid.min-idle=5
# 配置获取连接等待超时的时间
spring.datasource.druid.max-wait=60000
# 打开PSCache，并且指定每个连接上PSCache的大小
spring.datasource.druid.pool-prepared-statements=true
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
#spring.datasource.druid.max-open-prepared-statements= #和上面的等价
#spring.datasource.druid.validation-query=
#spring.datasource.druid.validation-query-timeout=
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
spring.datasource.druid.test-while-idle=true
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
spring.datasource.druid.time-between-eviction-runs-millis=60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
spring.datasource.druid.min-evictable-idle-time-millis=300000
#spring.datasource.druid.max-evictable-idle-time-millis=
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
spring.datasource.druid.filters=stat,wall,log4j
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
spring.datasource.druid.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
#################################### 监控配置
# WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
spring.datasource.druid.web-stat-filter.enabled=true
spring.datasource.druid.web-stat-filter.url-pattern=/*
spring.datasource.druid.web-stat-filter.exclusions=/druid/*,*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico
spring.datasource.druid.web-stat-filter.session-stat-enable=true
spring.datasource.druid.web-stat-filter.session-stat-max-count=10
#spring.datasource.druid.web-stat-filter.principal-session-name=
#spring.datasource.druid.web-stat-filter.principal-cookie-name=
#spring.datasource.druid.web-stat-filter.profile-enable=
# StatViewServlet配置，说明请参考Druid Wiki，配置_StatViewServlet配置
spring.datasource.druid.stat-view-servlet.enabled=true
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
spring.datasource.druid.stat-view-servlet.reset-enable=true
spring.datasource.druid.stat-view-servlet.login-username=admin
spring.datasource.druid.stat-view-servlet.login-password=admin
#spring.datasource.druid.stat-view-servlet.allow=
#spring.datasource.druid.stat-view-servlet.deny=

DruidDataSourceProperties

package com.yishi.config;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "spring.datasource.druid")
public class DruidDataSourceProperties {
 private String driverClassName;
 private String url;
 private String username;
 private String password;

 private int initialSize;
 private int minIdle;
 private int maxActive;
 private long maxWait;
 private long timeBetweenEvictionRunsMillis;
 private long minEvictableIdleTimeMillis;
 private String validationQuery;
 private boolean testWhileIdle;
 private boolean testOnBorrow;
 private boolean testOnReturn;
 private boolean poolPreparedStatements;
 private int maxPoolPreparedStatementPerConnectionSize;
 private String filters;
 private String connectionProperties;

 // 省略 get、set 方法
}

MysqlDruidConfiguration

package com.yishi.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;

import javax.sql.DataSource;
import java.sql.SQLException;

@Configuration
@EnableConfigurationProperties({DruidDataSourceProperties.class})
@MapperScan(value = MysqlDruidConfiguration.PACKAGE, sqlSessionFactoryRef = "mysqlSqlSessionFactory")
public class MysqlDruidConfiguration {

 static final String PACKAGE = "com.yishi.dao";

 static final String MAPPER_LOCATION = "classpath:mapper/*.xml";

 @Autowired
 private DruidDataSourceProperties properties;

 @Bean(name = "mysqlDataSource")
 @Primary
 public DataSource mysqlDataSource() {
 DruidDataSource druidDataSource = new DruidDataSource();
 druidDataSource.setDriverClassName(properties.getDriverClassName());
 druidDataSource.setUrl(properties.getUrl());
 druidDataSource.setUsername(properties.getUsername());
 druidDataSource.setPassword(properties.getPassword());
 druidDataSource.setInitialSize(properties.getInitialSize());
 druidDataSource.setMinIdle(properties.getMinIdle());
 druidDataSource.setMaxActive(properties.getMaxActive());
 druidDataSource.setMaxWait(properties.getMaxWait());
 druidDataSource.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRunsMillis());
 druidDataSource.setMinEvictableIdleTimeMillis(properties.getMinEvictableIdleTimeMillis());
 druidDataSource.setValidationQuery(properties.getValidationQuery());
 druidDataSource.setTestWhileIdle(properties.isTestWhileIdle());
 druidDataSource.setTestOnBorrow(properties.isTestOnBorrow());
 druidDataSource.setTestOnReturn(properties.isTestOnReturn());
 druidDataSource.setPoolPreparedStatements(properties.isPoolPreparedStatements());
 druidDataSource.setMaxPoolPreparedStatementPerConnectionSize(properties.getMaxPoolPreparedStatementPerConnectionSize());
 druidDataSource.setConnectionProperties(properties.getConnectionProperties());
 try {
  druidDataSource.setFilters(properties.getFilters());
  druidDataSource.init();
 } catch (SQLException e) {
  e.printStackTrace();
 }

 return druidDataSource;
 }

 @Bean(name = "mysqlTransactionManager")
 @Primary
 public DataSourceTransactionManager mysqlTransactionManager() {
 return new DataSourceTransactionManager(mysqlDataSource());
 }

 @Bean(name = "mysqlSqlSessionFactory")
 @Primary
 public SqlSessionFactory mysqlSqlSessionFactory(@Qualifier("mysqlDataSource") DataSource mysqlDataSource)
  throws Exception {
 final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
 sessionFactory.setDataSource(mysqlDataSource);
 sessionFactory.setMapperLocations(
  new PathMatchingResourcePatternResolver().getResources(MysqlDruidConfiguration.MAPPER_LOCATION));
 return sessionFactory.getObject();
 }

 @Bean(name = "mysqlJdbcTemplate")
 public JdbcTemplate hiveJdbcTemplate(@Qualifier("mysqlDataSource") DataSource dataSource) {
 return new JdbcTemplate(dataSource);
 }
}

开发环境

IDEA 2020.2
Apache Maven 3.2.5
主要库版本：
org.springframework.boot.spring-boot-dependencies.2.1.1.RELEASE
com.baomidou.mybatis-plus-boot-starter.3.2.0
com.alibaba.druid-spring-boot-starter.1.1.10

异常信息

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.yishi.dao.UserDao.selectList
	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:235)
	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:53)
	at org.apache.ibatis.binding.MapperProxy.lambda$cachedMapperMethod$0(MapperProxy.java:98)
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:97)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:92)
	at com.sun.proxy.$Proxy105.selectList(Unknown Source)
	at com.yishi.impl.UserServiceImpl.insert(UserServiceImpl.java:104)
	at com.yishi.impl.UserServiceImpl.insert(UserServiceImpl.java:39)
	at com.yishi.impl.UserServiceImpl$$FastClassBySpringCGLIB$$ac0e5ea9.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294)
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
	at com.yishi.impl.UserServiceImpl$$EnhancerBySpringCGLIB$$c9a67874.insert(<generated>)
	at com.yishi.controller.UserController.add(UserController.java:20)
	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.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:189)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)

解决方式

一开始没打开 Debug 日志，导致很多 Debug 的信息都没法及时捕获，打开 Debug 日志后，WARN 如下：

2020-09-01 10:02:15 [restartedMain] WARN  o.m.s.m.ClassPathMapperScanner - Skipping MapperFactoryBean with name 'userDao' and 'com.yishi.dao.UserDao' mapperInterface. Bean already defined with the same name!

...

2020-09-01 10:02:15 [restartedMain] WARN  o.m.s.m.ClassPathMapperScanner - No MyBatis mapper was found in '[com.yishi.dao]' package. Please check your configuration.

可以看到，在注入 dao 时说已经存在了，难怪 Mybatis-Plus 生成的 BaseMapper 所有方法报错，压根就没注入。那什么地方先注入了呢？看来看去，原来是在 MysqlDruidConfiguration.java 这个类在自动配置时配置 “mysqlSqlSessionFactory” 这个 bean 时已经先注入 dao 相关的信息！

最后解决方式，删掉 MysqlDruidConfiguration.java 和 DruidDataSourceProperties.java这两个类，springboot 都已经帮我们处理了 druid 的配置，其实这两个类也没什么用。

总结

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