help with ant and copy plugins for Java application

[Sergio Schvezov]

El martes, 14 de junio de 2016 08h'15:48 ART, Jenny Murphy 
<jenny.murphy at episensor.com> escribió:
> Hi,
>  I am trying to build up some competency with snapcraft for java
> applications.
> 
> Currently I have a hello world project which is based on
> https://github.com/ubuntu-core/snapcraft/blob/1.x/examples/java-hello-world/snapcraft.yaml
> .
> 
> I have extended in that HelloWorld.java references a method from another
> package in an external jar file (HellowWorld-helper.jar)
> 
> I edited the snapcraft.yaml to use the copy plugin to copy the jar file to
> the jar directory.
> It can be seen there after the snap stage.
> 
> However in bin.wrapper.wrapper , the external jar file is not added to the
> classpath. So the application fails on running.
> 
> How do I fix this?

First of all, thank you for giving this a try. I'll start with a couple of 
details and follow on with a solution.

First of all, `bin.wrapper.bin` is an implementation detail, likely to go 
away when we implement allowing `apps` (and `plugins`) to define 
environment variables (https://pad.lv/1583259) which would do the right 
thing on a snappy system. How would this look like in the not so distant 
future:

...
apps:
   bin:
      command: ....
      environment:
          CLASSPATH: $CLASSPATH:$SNAP/path_to_jar/jar.jar

parts:
    ...

Now on to your problem. The java related plugins have logic to export 
environment variables, but each part (driven by a plugin), is a private 
world of its own. Since you used the copy plugin, the logic in the copy 
plugin is just to copy. How do we solve in the immediate future? Well you 
would need to create something similar to that wrapper and export the 
required CLASSPATH.

I'll cut off here to not go into to much details, but I am happy to follow 
up on this.

Cheers
Sergio


-- 
Enviado con Dekko desde mi dispositivo Ubuntu