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This article introduces the relevant knowledge of "how to solve SpringBoot2.0 integration tk.mybatis anomalies". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The configuration of pom is as follows (standard simple version):

Org.springframework.boot spring-boot-starter-parent 2.1.4.RELEASE 1.8 UTF-8 UTF-8 1.1.5 1.2.3 tk.mybatis mapper-spring-boot-starter ${tk.mybatis.version} Com.github.pagehelper pagehelper-spring-boot-starter ${pagehelper.version}

The startup report exception is as follows:

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 (NativeMethod)

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

It is said that the version is incompatible, and it is not possible to replace the MapperScan annotation with tk. After searching for it for a long time, it is because there are no attributes defined in the defined data entity class:

When mapper scans the xml, it will look for the corresponding entity class and find that there is no field (column), so it throws an exception.

Why does this happen to bloggers?

When I build the framework, I will design the Controller, Service and Dao layers according to the product. I only define the entity of the Dao layer, and the contents are filled by specific developers, so there is an awkward situation in which the shelf is set up but cannot run. The solution is that the entity entity class should not be empty. Casually, just give it an id:

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