Anyone run into class not found org/springframework/aot/AotDetector ?

[Rick Reumann]

In this SpringBoot webapp, where I have a MyBatis services layer (jar) being used as a dependency, when the app starts up in Tomcat (9.0.71) the app is now failing to start with:

Application run failed
java.lang.NoClassDefFoundError: org/springframework/aot/AotDetector
at org.mybatis.spring.mapper.ClassPathMapperScanner.<init>(ClassPathMapperScanner.java:91)

   . . .

Caused by: java.lang.ClassNotFoundException: org.springframework.aot.AotDetector
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1412) 
... 41 common frames omitted

Just wondering if you have some ideas what could be triggering this?

I'm not using any sort of special maven compiling (no explicit AOT stuff ) 

Thanks for any help

[Iwao AVE!]

Hello Rick,

I'm not sure...version mismatch, maybe?

You seem to be using mybatis-spring-boot-starter 3.0.3.

Please try the latest: 3.0.4.

And check the version compatibility matrixes.

https://mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/#requirements

https://mybatis.org/spring/#requirements

Regards,

Iwao

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[Tim]

Is the spring aot jar in WEB-INF/lib or are you bundling it as an uber jar?

Do you have an example repo?

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[Rick Reumann]

Hey Tim, that's the the thing, the aot jar shouldn't be required at all so it's not bundled. I did manage to get past this issue when I upgraded the spring parent version in the web app relying on the mybatis project, so that's good, however it *did* seem to be working without having to do that, so not sure what changed. Forcing that upgrade to the webapp using the newer mybatis project, seems is going to force a lot more upgrades to the project, which is ok just curious what happened to all of a sudden have the project complaining about not finding AotDetector.

My mybatis services jar (not an uber jar) is a mybatis project using spring-boot-starter-parent 3.4.1and mybatis spring boot starter 3.0.4. 

The webapp using this jar is using spring-boot-starter-parent 2.7.9, which I believe "used" to be working - but something I added/changed caused the error I initially posted about. If I upgrade the web app to a newer version of Spring (3.x versions) which requires changing to jakarta packages etc, I could get things working so I can end up managing. Still would be curious what caused things to start throwing the error about mybatis' mapper scanner needing to find AotDetector:

Caused by: java.lang.NoClassDefFoundError: org/springframework/aot/AotDetector
at org.mybatis.spring.mapper.ClassPathMapperScanner.<init>(ClassPathMapperScanner.java:95)