How do I add Java Azure Functions in a Maven submodule

Question

Problem description

I have my Java library A and I create a new Azure Functions module B (following https://learn.microsoft.com/en-us/azure/azure-functions/functions-create-maven-intellij), which should use A as a dependency.

Now:

if I create B as a new and standalone module, it works;
if I add B as another submodule of a common parent C, it does not.

More specifically: no problems with compilation, running and deployment of my functions, but when any of them is triggered I get a ClassNotFoundException for each class defined in A. And no wonder it happens, since A.jar is not present in the lib subfolder of the Azure Function's run folder (something like {myUser}\AppData\Local\Temp\azure-functions16636049357177434984 on my Windows PC in case of local run). But I don't understand why the dependency jar is not copied there, especially that after compilation it's present in the target\azure-functions\taxclaims-azure-1596530670055\lib folder of my IntelliJ project.

Why does this happen and how to fix it?

Minimal example

I have TestParent Java Maven project, with two modules:

dependency-module
azure-functions-module (depending on dependency-module)

In dependency-module I have a DependencyClass with empty body, whereas in azure-functions-module I have HttpTriggerFunction class with the following method:

@FunctionName("TestFunction")
public HttpResponseMessage run(
@HttpTrigger(name = "req", methods = {HttpMethod.GET, HttpMethod.POST}, authLevel = AuthorizationLevel.ANONYMOUS) HttpRequestMessage<Optional<String>> request, final ExecutionContext context) 
{
   DependencyClass instance = new DependencyClass();
   return request.createResponseBuilder(HttpStatus.OK).body("OK").build();
}

This module can be successfully deployed, but when the TestFunction is triggered, I obtain ClassNotFoundException for DependencyClass.

However, if I create another project, called TestStandaloneParent, with a module standalone-azure-functions-module and the same function as above, then everything works smoothly.

If needed of course I can add further details, especially the pom.xml files.

Does the azure-functions-module module reference the dependency of the dependency-module module? — Frank Borzage
– Frank Borzage, Commented Oct 19, 2020 at 9:15
Yes, I have the suitable dependency in azure-functions-module's pom.xml: <dependency> <groupId>org.example</groupId> <artifactId>dependency-module</artifactId> <version>1.0-SNAPSHOT</version> </dependency> — kdr
– kdr, Commented Oct 19, 2020 at 9:38
Stupid question: did you analyse the packaged result if your library is packed together with it? Like unpacking it? — Peter Branforn
– Peter Branforn, Commented Oct 20, 2020 at 8:16
You mean checking whether the dependency is not inside the jar? No, it's not there. — kdr
– kdr, Commented Oct 20, 2020 at 14:44
Looks like the issue has been addressed github.com/microsoft/azure-tools-for-java/issues/7063 — Davide Sottara
– Davide Sottara, Commented Dec 5, 2022 at 22:54

Peter Branforn · Accepted Answer · 2020-10-20 08:18:24Z

1

Please have a look at this other question here: How to add dependency JAR in java azure functions

It looks like a problem with the packaging, you need to tweak it by using the maven assembly plugin config manually.

answered Oct 20, 2020 at 8:18

Peter Branforn

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1 Comment

kdr Over a year ago

Thanks, the link is really useful. Following the approach described there, I have managed to make Maven create a jar with dependencies instead of the "simple" one. However, this only in the target folder of my project. On run/deploy the .jar is still the old one, and I'm quite perplexed about this. I need to spend more time investigating this.

Tomek · Accepted Answer · 2021-10-07 21:04:37Z

1

It looks like IntelliJ Azure Plugin doesn't use pom.xml. What you can do is to go File->Project structure->Project settings->Modules, choose module with Azure Functions and manually add jar fil as a dependency. In my case I achieve the result, but I'm not happy with the way of solution.

answered Oct 7, 2021 at 21:04

Tomek

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