Tk-Mapper报错集锦

1. 包扫描路径导致的问题。项目启动报错

java.lang.NoSuchMethodException: tk.mybatis.mapper.provider.base.BaseSelectProvider.<init>()
   at java.lang.Class.getConstructor0(Class.java:3082) ~[na:1.8.0_66]
   at java.lang.Class.newInstance(Class.java:412) ~[na:1.8.0_66]
   at org.apache.ibatis.builder.annotation.ProviderSqlSource.invokeProviderMethod(ProviderSqlSource.java:165) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.builder.annotation.ProviderSqlSource.createSqlSource(ProviderSqlSource.java:116) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.builder.annotation.ProviderSqlSource.getBoundSql(ProviderSqlSource.java:102) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:293) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) ~[mybatis-3.5.0.jar:3.5.0]
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_66]
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_66]
   at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_66]
   at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) ~[mybatis-spring-2.0.0.jar:2.0.0]
   at com.sun.proxy.$Proxy66.selectList(Unknown Source) ~[na:na]
   at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230) ~[mybatis-spring-2.0.0.jar:2.0.0]
   at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:144) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:77) ~[mybatis-3.5.0.jar:3.5.0]

以上这个是因为你写的Tk-mapper基类在你的包扫描范围（下面的util.TkMapper）。正常包扫描范围只需DAO就够了。

Tk-Mapper报错集锦

改成如下扫描路径就好用了。

Tk-Mapper报错集锦

（2）看下你的jar包引入的对不对。不要引入冲突。以下的jar文件引入一个即可。我用的spring boot的那个。

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper</artifactId>
    <version>3.4.5</version>
</dependency>

<dependency>
    <groupId>tk.mybatis</groupId>
    <artifactId>mapper-spring-boot-starter</artifactId>
    <version>2.0.0</version>
</dependency>

2.数据库名称或者字段名称导致的错误。

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'healthy.user_p_o' doesn't exist
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_66]
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_66]
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_66]
   at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[na:1.8.0_66]
   at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.Util.getInstance(Util.java:387) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3870) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3806) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2470) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2617) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2550) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192) ~[mysql-connector-java-5.1.37.jar:5.1.37]
   at com.zaxxer.hikari.pool.ProxyPreparedStatement.execute(ProxyPreparedStatement.java:44) ~[HikariCP-3.2.0.jar:na]
   at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.execute(HikariProxyPreparedStatement.java) ~[HikariCP-3.2.0.jar:na]
   at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79) ~[mybatis-3.5.0.jar:3.5.0]
   at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63) ~[mybatis-3.5.0.jar:3.5.0]

看日志是我的这个表healthy.user_p_o 没找到。我的数据库和表是 healthy.user 很明显不一样，解决办法是userPO类上加注解。这样tk-mapper读取的时候就会按照user表名读取了。

Tk-Mapper报错集锦

3.XXXX.DAO中没有加mapper注解

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-04-19 18:16:33.404 ERROR 6244 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :

***************************
APPLICATION FAILED TO START
***************************

Description:

Field userDAO in zy.healthy.service.LoginService required a bean of type 'zy.healthy.dao.UserDAO' that could not be found.

The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)

Action:

Consider defining a bean of type 'zy.healthy.dao.UserDAO' in your configuration.

Process finished with exit code 1

这是我UserDAO中没加mapper注解造成的。加mapper注解就好了。

看网上还有的错误是下面这个包导入的不对。应该导入tk的MapperScan 但是我就按下图这么配置目前没有遇到问题。

Tk-Mapper报错集锦

1. 包扫描路径导致的问题。项目启动报错

2.数据库名称或者字段名称导致的错误。

3.XXXX.DAO中没有加mapper注解

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