Implementation class not found exception

[lai yoke hman]

Hi,

I'm getting implementation class not found exception when i'm trying to get the mapper using the interface INSTANCE way following the example in the documentation.
May i know where's all the generated implementation goes?

[Gunnar Morling]

Hi,

It depends on the way how you integrate MapStruct into your project. Which kind of build tool are you using? Maven? Gradle?

If you e.g. use MapStruct with Maven as described in http://mapstruct.org/documentation/, the generated sources will be under "target/generated-sources". If you e.g. use MapStruct in a plain Eclipse project (i.e. not with Maven via M2E), the generated sources will be in ".apt_generated".

--Gunnar

[lai yoke hman]

Hi,

This is new to me, and I just realized I need to enable annotation processor in Eclipse. Now i got the .apt_generated folder in my project but I still don't see the generated implementation, can you help?

[Gunnar Morling]

Hi,

Have you added the the MapStruct JAR and the FreeMarker JAR from the distribution (http://sourceforge.net/projects/mapstruct/files/) to your factory path (In Eclipse settings that's under Java Compiler -> Annotation Processing -> Factory Path)? Also your Eclipse project must use language level 1.6 or later. If it still doesn't work, you may check in the Error Log (Window -> Show View -> Error Log) whether anything shows up.

Note that this will automatically be configured for you if you have configured MapStruct via Maven and import your project into Eclipse (the M2E plug-in then will set up factory path etc. for you).

I will add a how-to for the Eclipse set-up if I find a minute.

Hth,

--Gunnar

[Andreas Gudian]

FYI, the freemarker jar is not required anymore (as we use the shaded version within our jar). :-)

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[Gunnar Morling]

Aah, right. I had forgotten about that one :) Thanks!

Btw. it's one of the planned feature for the MapStruct Eclipse plug-in to help with the set-up of the processor: https://github.com/mapstruct/mapstruct-eclipse/issues/6

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[lai yoke hman]

Thanks for the quick reply, I will try again.

And yeah, a how-to for the Eclipse setup will be great.