How to pass environment Variables to MavenLauncher

[AryanMansani]

I have a project, where I am fetching code from a rep and then building a CtModel from it that repo.

Now in some project there are some environment variables in dependencies like -

<dependency>
<groupID>common-annotation</groupID>
<artifactID>common-annotation</artifactID>
<version>${revision}<version>
</dependency>

Here, revision is that variable, now when building a model, spoon gives an error.

Is there a way I can pass this variable to Maven Launcher or any other work around.

[I-Al-Istannen]

Probably not the best solution, but if they are present as environment variables, the spawned mvn process will inherit them. This means that revision=foo java YourProgram should work.

Setting that from inside your program is not really portable though. The maven launcher would need to expose an interface and use the addShellEnvironment method to pass that along to the invocation request.

[I-Al-Istannen]

Ah, I just thought of another slightly more realistic workaround:
You could edit the pom to add them to the properties section. Either using an XML library or some well-placed regular expressions :)

[AryanMansani]

That's a really good idea, but for it, we need to beforehand identify either manually or by XML parser if this variable is not present in the properties, so for a single module it sounds okay but for a multi-modular project it sounds like a lot of work, is there a way we can automatically identify which variables are not present using any library?

[I-Al-Istannen]

You need to know which environment variables need to be set in any case. I guess we could also add that to the MavenLauncher API, setting environment variables sounds useful enough.

See #4830.

[I-Al-Istannen]

The new API you want to look at is setEnvironmentVariable in the MavenLauncher. Do let us know if this does not solve your issue @AryanMansani :)