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SpringBoot2.0整合tk.mybatis异常解决

小诸哥 0

pom配置如下(标准简易版):

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
    </parent>
 
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <tk.mybatis.version>1.1.5</tk.mybatis.version>
        <pagehelper.version>1.2.3</pagehelper.version>
    </properties>
 
    <dependencies>
 
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>${tk.mybatis.version}</version>
        </dependency>
 
        <!-- pageHelper -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>${pagehelper.version}</version>
        </dependency>
    </dependencies>

启动报异常如下:

Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1  

Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
 at java.lang.AbstractStringBuilder.substring(AbstractStringBuilder.java:908)
 at java.lang.StringBuilder.substring(StringBuilder.java:76)
 at tk.mybatis.mapper.mapperhelper.SqlHelper.getAllColumns(SqlHelper.java:247)
 at tk.mybatis.mapper.mapperhelper.SqlHelper.exampleSelectColumns(SqlHelper.java:534)
 at tk.mybatis.mapper.provider.ExampleProvider.selectByExample(ExampleProvider.java:96)
 at tk.mybatis.mapper.provider.ExampleProvider.selectByExampleAndRowBounds(ExampleProvider.java:111)
 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 tk.mybatis.mapper.mapperhelper.MapperTemplate.setSqlSource(MapperTemplate.java:246)
 ... 29 common frames omitted

有说是版本不兼容的问题,有说什么MapperScan注解换成tk的,都不行,找了半天,原来是因为定义的数据实体类中没有定义任何属性造成的:  

导致mapper扫描xml的时候,会去找对应的实体类,结果发现一个字段(列)都没有,于是就抛了异常

博主为什么会出现这种情况呢?

我搭框架的时候,会依据产品设计好Controller、Service和Dao层,Dao层的entity我只定义,里面的内容由具体的开发者填充,于是乎就出现了,架子搭好了却跑不起来的尴尬局面,解决的办法就是,entity实体类不要空,随便意思下,给个id即可:

标签: SpringBoot mybatis 解决