mybatis is not able to find typehandlers

[Marvin Berger]

Hey,

I am currently creating my first object with spring boot and mybatis, so please be patient with me, if the mistake is obvious.

When I start the application, I always get a ClassNotFoundException for the Class TrimmedStringTypeHandler. 

In my mapper xml file I wrote something like this:

        <result property="bezeichnung" column="VP_POS_BEZ" typeHandler="TrimmedStringTypeHandler" />

The handler looks like this:

package de.firma.iservice.bvs.core.typehandler;


public class TrimmedStringTypeHandler extends BaseTypeHandler<String> {...}

Finally, my application.yml looks like this:

spring.datasource.maximum-pool-size: 10

mybatis:

  type-handlers-package: de.firma.iservice.bvs.core.typehandler

  type-aliases-package: de.firma.iservice.bvs.core.models.*

  mapper-locations: /mapper/*Mapper.xml

Am I missing something?

What really confuses me, although it is kind of a workaround: 

If I add the package of the typehandler to the type-aliases-package property, everything works flawless. But this does not seem right. Is it?

[Iwao AVE!]

Hello Marvin,

type-handlers-package is used to register type handlers globally.
So, this is the setting you use when you want to override the built-in StringTypeHandler.
You may need to add @MappedTypes(String.class) to the type handler.
As global type handlers are used implicitly, you don't need to specify typeHandler in <result />.

Now, if you want to use TrimmedStringTypeHandler only for particular properties, remove type-handlers-package from the config and specify typeHandler="de.firma.iservice.bvs.core.typehandler.TrimmedStringTypeHandler" in each <result />.
To use short names (i.e. typeHandler="TrimmedStringTypeHandler"), you need to register the aliases. e.g.

type-aliases-package: de.firma.iservice.bvs.core.models,de.firma.iservice.bvs.core.typehandler

(* is unnecessary)

Please let me know if you have any further questions.

Regards,
Iwao

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[Marvin Berger]

Thank you so much, seems like I just had a misunderstanding and stumbled across the correct configuration.