[play 2.5 scala] ClassNotFoundException on model classes

[Edgars]

Hi,

is there a basepath or anything else necessary to create object using Class.forName?

Example:

abstract class SomeBaseController (...)

{

val SomeData = Class.forName("models.SomeDAO.SomeRepo").asInstanceOf[Class[_ <: models.SomeDAO.SomeRepo]].newInstance()

}

And I always get Error injecting constructor, java.lang.ClassNotFoundException: models.SomeDAO.SomeRepo

[Will Sargent]

It's best if you don't use Class.forName, as access to the base classloader is not needed for the system.  

The recommended practice for a "service" or "repository" class is to bind the class through Guice module, which you can do by adding an "app/Modules.scala" file into the application and then binding it as an eager singleton.  See the play-scala seed project for example:

https://github.com/playframework/playframework/blob/master/templates/play-scala/app/Module.scala#L23

From there, you can use @Inject() in the constructor to reference the instance.

Will.

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[Edgars]

This works, and I can see point you are making, but I chose previous example because I need to pass different DAO.repo table classes for different controllers, that will extend this abstract BaseController. 

How can this be done with injection instead of passing string as class name?

[Will Sargent]

You can subclass your table classes and rely on the different types for injection, or you can use @Named(“tablename”) if all the table classes have the same type.

Will.

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