Generated Java templates have unresolved dependency

[s1monw1]

Both the java8 and java12 template consist of multiple Gradle modules: function, entrypoint and model with both function and entrypoint pulling a local project dependency of model.

If used via faas-cli, the generated code (everything from function) cannot be compiled since the model dependency is not resolvable (since it is not being generated as part of the user-facing template). This submodule needs to be decoupled and made available as a remote dependency.

Expected Behaviour

If I generate a function based on a template via faas-cli, I expect to get a project I can build without seeing any compilation issues.

Current Behaviour

Using java8 and java12, the generated function cannot be built due to compilation errors (unresolved dependency to model)

Possible Solution

I propose the following solution:

• extract model to a separate repository and use jitpack to pull that code into the template(s). To do so...
  • the model has to live in a separate repo, let's say openfaas/java-template-model and a tag/release needs to be created (e.g. 1.0.0)
  • ... the Gradle maven plugin has to be added to the model module
  • ... entrypoint and function have to add maven { url 'https://jitpack.io' } as a repository in the build.gradle plus declaring a dependency implementation 'com.github.openfaas:java-template-mode:1.0.0'
• Optional: add model as a git submodule to the actual template so that it is still obvious that the model is part of the template itself.
• You can find a PoC in my Kotlin template which uses the same approach with jitpack and git submodule: https://github.com/s1monw1/openfaas-kotlin/tree/master/template/kotlin

Your Environment

• https://github.com/openfaas/templates/tree/master/template/java12
• https://github.com/openfaas/templates/tree/master/template/java8

[SchulteMarkus]

I can just agree here. Creating a Java OpenFaas function can be improved regarding developer experience.

In my opinion, AWS Java lambda is easy to use for creating custom Java functions, for details have a look at https://docs.aws.amazon.com/lambda/latest/dg/java-programming-model-handler-types.html

[alexellis]

I started publishing the dependencies to jcenter but ran into issues with all of the admin requirements and JIRA system. I will bump it up on the list to review again.

[alexellis]

Closed by https://github.com/openfaas/templates/issues/210