Spring Boot starter vs components

[Jason Bennett]

We're trying to minimize our use of starter POMs with Spring Boot, in order to minimize extraneous dependencies in our app. Mybatis, however, appears to behave differently when its starter jar is included. When I use the starter jar, everything in my app works fine. When, however, I include the 3 parts (mybatis, mybatis-spring and mybatis-spring-boot-autoconfigure), the annotation scanning does not appear to run, and no mappers are instantiated. I cannot, however, find any code anywhere that would cause this behavior. Am I missing something obvious?

jason

[Kazuki Shimizu]

Hi Jason,

Could you provide a reproduce projects(work fine and not work fine) on GitHub ?

[Jason Bennett]

In the process of producing that project, I managed to pull out the problem.

In trying to distill my dependencies from the starter jars, I had neglected to add the tomcat-jdbc library to my list of dependencies. From looking at the debug trace, if Mybatis cannot find a datasource, it (more or less) terminates its initialization process, without an error. Later, when trying to find beans to inject into my service, Spring throws an error, because Mybatis never initialized the mapper files.

I'm not sure if this is something Mybatis can better message, but I found it a little subtle to discover.

jason

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Jason Bennett, jas...@acm.org
E pur si muove!

[Kazuki Shimizu]

Hi Jason,

To enable the MybatisAutoConfiguration, you need to define a bean that implements the DataSource interface like.

 

>  if Mybatis cannot find a datasource, it (more or less) terminates its initialization process, without an error.

I think It is working as design ! This behavior is standard design on creating a spring boot auto-configure class.

For reference...

* https://github.com/spring-projects/spring-boot/blob/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jooq/JooqAutoConfiguration.java#L55

* https://github.com/spring-projects/spring-boot/blob/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/JdbcTemplateAutoConfiguration.java#L46

Thanks.

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