将MapperScan错误使用导致的BindingException问题
将MapperScan错误使用导致的BindingException问题
冬天里的懒猫
发布于 2021-09-22 10:57:53
发布于 2021-09-22 10:57:53
在前面的代码中，使用fluent mybatis的mapper对表进行增删改查都没有问题。 但是fluent mybatis官方也说了，自动会生成dao层代码，将dao及其实现类都生成好了。因此也想尝试下生成的代码使用的效果。 此外，由于不想建多个project来进行测试，因此对于不同的测试，都在src/main/java下面弄各种不同的包来进行区分。本次测试的package:com.dhb.gts.javacourse.week6.mysqltest目录。
1.环境说明
Starter类代码:
package com.dhb.gts.javacourse.week6.mysqltest;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
@MapperScan(basePackages = {"com.dhb.gts.javacourse.fluent"})
public class Starter {
public static void main(String[] args) {
SpringApplication.run(Starter.class, args);
}
}Controller层代码：
package com.dhb.gts.javacourse.week6.mysqltest;
import com.alibaba.fastjson.JSON;
import com.dhb.gts.javacourse.fluent.dao.intf.OrderSummaryDao;
import com.dhb.gts.javacourse.fluent.entity.OrderSummaryEntity;
import com.dhb.gts.javacourse.fluent.helper.OrderSummaryMapping;
import com.dhb.gts.javacourse.fluent.mapper.OrderDetailMapper;
import com.dhb.gts.javacourse.fluent.mapper.OrderSummaryMapper;
import com.google.common.base.Stopwatch;
import lombok.extern.slf4j.Slf4j;
import org.apache.logging.log4j.util.Strings;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@RestController
@Slf4j
public class QueryOrderTable {
@Autowired
OrderSummaryDao orderSummaryDao;
@RequestMapping("/queryByKey")
public String queryByKey(String key) {
Stopwatch stopwatch = Stopwatch.createStarted();
Integer orde_id = Integer.parseInt(key);
OrderSummaryEntity entity = orderSummaryDao.selectById(orde_id);
stopwatch.stop();
System.out.println("通过key查询，走索引耗时：" + stopwatch);
return JSON.toJSONString(entity);
}
@RequestMapping("/queryByOther")
public String queryByKey(String orderNo, String expressNo) {
Stopwatch stopwatch = Stopwatch.createStarted();
Map<String, Object> map = new HashMap<>();
if (Strings.isNotEmpty(orderNo)) {
Integer order_no = Integer.parseInt(orderNo);
map.put(OrderSummaryMapping.orderNo.column, order_no);
} else if (Strings.isNotEmpty(expressNo)) {
map.put(OrderSummaryMapping.expressNo.column, expressNo);
}
List<OrderSummaryEntity> entitys = orderSummaryDao.selectByMap(map);
stopwatch.stop();
System.out.println("不通过key查询，全表扫描耗时：" + stopwatch);
return JSON.toJSONString(entitys);
}
}mapper及dao层代码，通过fluent mybatis生成。
package com.dhb.gts.javacourse.week6.mysqltest;
import cn.org.atool.generator.FileGenerator;
import cn.org.atool.generator.annotation.Column;
import cn.org.atool.generator.annotation.Table;
import cn.org.atool.generator.annotation.Tables;
import com.dhb.gts.javacourse.week5.typehandler.MyDateTypeHandler;
import java.util.Date;
public class EntityGenerator {
// 数据源 url
static final String url = "jdbc:mysql://192.168.162.49:3306/gts?useUnicode=true&characterEncoding=utf8";
// 数据库用户名
static final String username = "gts";
// 数据库密码
static final String password = "mysql";
public static void main(String[] args) {
// 引用配置类，build方法允许有多个配置类
FileGenerator.build(Empty.class);
}
@Tables(
// 设置数据库连接信息
url = url, username = username, password = password,
// 设置entity类生成src目录, 相对于 user.dir
srcDir = "src/gens/java",
// 设置entity类的package值
basePack = "com.dhb.gts.javacourse.fluent",
// 设置dao接口和实现的src目录, 相对于 user.dir
daoDir = "src/gens/java",
// 设置哪些表要生成Entity文件
tables = {
@Table(value = {"T_ORDER_SUMMARY:OrderSummary"},
columns = {
@Column(value = "PAYMENT_METHOD", javaType = Integer.class),
@Column(value = "IS_VALIDATE", javaType = Integer.class)
}, logicDeleted = "IS_VALIDATE", gmtCreated = "CREATE_TIME", gmtModified = "UPDATE_TIME"),
}
)
static class Empty {
}
}表结构如下：
/*
Navicat MySQL Data Transfer
Source Server : 192.168.162.49(gts)
Source Server Version : 50717
Source Host : 192.168.162.49:3306
Source Database : gts
Target Server Type : MYSQL
Target Server Version : 50717
File Encoding : 65001
Date: 2021-09-09 18:11:29
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for T_ORDER_SUMMARY
-- ----------------------------
DROP TABLE IF EXISTS `T_ORDER_SUMMARY`;
CREATE TABLE `T_ORDER_SUMMARY` (
`ORDER_ID` int(11) NOT NULL AUTO_INCREMENT COMMENT '订单ID',
`ORDER_NO` int(11) NOT NULL COMMENT '订单编号',
`CUSTOMER_ID` int(11) NOT NULL COMMENT '下单用户ID',
`PAYMENT_METHOD` tinyint(4) NOT NULL COMMENT '支付方式：1现金，2余额，3网银，4支付宝，5微信',
`ORDER_AMOUNT` decimal(8,2) NOT NULL COMMENT '订单汇总金额',
`PAYMENT_MONEY` decimal(8,2) NOT NULL COMMENT '支付金额',
`CONSIGNEE_NAME` varchar(50) NOT NULL COMMENT '收货人姓名',
`CONSIGNEE_ADDRESS` varchar(100) NOT NULL COMMENT '收货人详细',
`CONSIGNEE_PHONE` varchar(30) NOT NULL COMMENT '收货人联系电话',
`EXPRESS_COMP` varchar(30) NOT NULL COMMENT '快递公司名称',
`EXPRESS_NO` varchar(50) NOT NULL COMMENT '快递单号',
`CREATE_TIME` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`IS_VALIDATE` tinyint(4) NOT NULL DEFAULT '1' COMMENT '数据是否有效标识：1有效数据，2 无效数据',
`UPDATE_TIME` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '最新更新时间',
PRIMARY KEY (`ORDER_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='订单汇总信息表 ';生成的代码都在src/gens/java目录，在build.gradle中配置了这个额外的resource目录。
sourceSets {
main {
java {
srcDirs = ['src/main/java', 'src/gens/java']
}
resources {
srcDirs = ['src/main/resources']
}
}
test {
java {
srcDirs = ['src/test/java']
}
resources {
srcDirs = ['src/test/resources']
}
}
}此外，在application.yml中指定了数据库信息：
# 数据源配置
spring.datasource.url: jdbc:mysql://192.168.162.49:3306/gts?useSSL=false&autoReconnect=true&characterEncoding=UTF-8
spring.datasource.username: gts
spring.datasource.password: mysql
spring.datasource.driver-class-name: com.mysql.cj.jdbc.Driver2.问题说明
现在启动：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.3)
2021-09-13 18:01:57.542 INFO 16620 --- [ restartedMain] c.d.g.j.week6.mysqltest.Starter : Starting Starter using Java 1.8.0_231 on DESKTOP-HR38DGU with PID 16620 (D:\workspace-mashibing\geektime-study\build\classes\java\main started by Administrator in D:\workspace-mashibing\geektime-study)
2021-09-13 18:01:57.544 INFO 16620 --- [ restartedMain] c.d.g.j.week6.mysqltest.Starter : No active profile set, falling back to default profiles: default
2021-09-13 18:01:57.585 INFO 16620 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2021-09-13 18:01:57.585 INFO 16620 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2021-09-13 18:01:58.530 INFO 16620 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8084 (http)
2021-09-13 18:01:58.537 INFO 16620 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-09-13 18:01:58.537 INFO 16620 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.50]
2021-09-13 18:01:58.604 INFO 16620 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-09-13 18:01:58.604 INFO 16620 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1019 ms
2021-09-13 18:01:59.087 INFO 16620 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2021-09-13 18:01:59.230 INFO 16620 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8084 (http) with context path ''
2021-09-13 18:01:59.238 INFO 16620 --- [ restartedMain] c.d.g.j.week6.mysqltest.Starter : Started Starter in 2.001 seconds (JVM running for 2.683)可以看到能成功启动。但是我们再访问一下controller提供的api: http://127.0.0.1:8084/queryByKey?key=100033
出现如下错误:
2021-09-13 18:02:57.507 ERROR 16620 --- [nio-8084-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.dhb.gts.javacourse.fluent.dao.intf.OrderSummaryDao.mapper] with root cause
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.dhb.gts.javacourse.fluent.dao.intf.OrderSummaryDao.mapper
at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:235) ~[mybatis-3.5.7.jar:3.5.7]
at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:53) ~[mybatis-3.5.7.jar:3.5.7]
at org.apache.ibatis.binding.MapperProxy.lambda$cachedInvoker$0(MapperProxy.java:108) ~[mybatis-3.5.7.jar:3.5.7]
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688) ~[na:1.8.0_231]
at org.apache.ibatis.util.MapUtil.computeIfAbsent(MapUtil.java:36) ~[mybatis-3.5.7.jar:3.5.7]
at org.apache.ibatis.binding.MapperProxy.cachedInvoker(MapperProxy.java:95) ~[mybatis-3.5.7.jar:3.5.7]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:86) ~[mybatis-3.5.7.jar:3.5.7]
at com.sun.proxy.$Proxy75.mapper(Unknown Source) ~[na:na]
at cn.org.atool.fluent.mybatis.base.IBaseDao.selectById(IBaseDao.java:62) ~[fluent-mybatis-1.7.2.jar:na]
at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627) ~[na:1.8.0_231]
at org.apache.ibatis.binding.MapperProxy$DefaultMethodInvoker.invoke(MapperProxy.java:159) ~[mybatis-3.5.7.jar:3.5.7]
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:86) ~[mybatis-3.5.7.jar:3.5.7]
at com.sun.proxy.$Proxy75.selectById(Unknown Source) ~[na:na]
at com.dhb.gts.javacourse.week6.mysqltest.QueryOrderTable.queryByKey(QueryOrderTable.java:32) ~[main/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_231]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_231]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_231]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_231]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.9.jar:5.3.9]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1064) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.9.jar:5.3.9]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.9.jar:5.3.9]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.50.jar:4.0.FR]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.9.jar:5.3.9]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.50.jar:4.0.FR]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:228) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.50.jar:9.0.50]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.9.jar:5.3.9]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.9.jar:5.3.9]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.9.jar:5.3.9]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.9.jar:5.3.9]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.9.jar:5.3.9]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.9.jar:5.3.9]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:190) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:163) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1723) [tomcat-embed-core-9.0.50.jar:9.0.50]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.50.jar:9.0.50]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_231]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_231]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.50.jar:9.0.50]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_231]上述代码如果修改为Mapper，而不是使用dao,则能正常访问：
@Autowired
OrderSummaryMapper orderSummaryMapper;
@RequestMapping("/queryByKey")
public String queryByKey(String key) {
Stopwatch stopwatch = Stopwatch.createStarted();
Integer orde_id = Integer.parseInt(key);
OrderSummaryEntity entity = orderSummaryMapper.findById(orde_id);
stopwatch.stop();
System.out.println("通过key查询，走索引耗时：" + stopwatch);
return JSON.toJSONString(entity);
}上述代码能够正常执行： http://127.0.0.1:8084/queryByKey?key=100033 返回结果：
{"consigneeAddress":"北京市朝阳区西坝河","consigneeName":"张三","consigneePhone":"13888888888","createTime":1631481629000,"customerId":10001,"expressComp":"顺丰","expressNo":"100110978472","isValidate":1,"orderAmount":56.00,"orderId":100033,"orderNo":100034,"paymentMethod":1,"paymentMoney":56.00,"updateTime":1631481629000}3.问题分析
仔细检查了代码，发现问题可能存在于Startler的注解。由于生成的dao层代码为于com.dhb.gts.javacourse.fluent.dap目录中。于Starter所在的 com.dhb.gts.javacourse.week6.mysqltest不在同一个目录，因此无法通过扫描下层目录的方式扫描到对应的类，因此只能通过手动配置scan。 那么此时，代码中偷懒了，误认为MapperScan也能扫描dao代码。因此将MapperScan的目录指向了com.dhb.gts.javacourse.fluent。 但是实际上这是一个错误的做法，MapperScan只能用来配置Mapper,而如果要指定Startler之后扫描的目录，则需要在@SpringBootApplication中指定： 代码修改如下：
package com.dhb.gts.javacourse.week6.mysqltest;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication(scanBasePackages = {"com.dhb.gts.javacourse.fluent.dao","com.dhb.gts.javacourse.week6.mysqltest"} )
@MapperScan(basePackages = {"com.dhb.gts.javacourse.fluent.mapper"})
public class Starter {
public static void main(String[] args) {
SpringApplication.run(Starter.class, args);
}
}这样解决了该问题。做了此种修改之后，使用dao层就不会出现问题了。
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原始发表：2021-09-13 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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