debugging swagger gradle plugin is a nightmare

Anoyne can provide any hints on how to debug issues with the gradle plugin for swagger?

I want to generate OpenAPI documentation based on java code.

When running resolve task I constantly get gradle exception... with no message.

 

> Task :module-name:resolve FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':module-name:resolve'.
> org.gradle.api.GradleException (no error message)

Here is my gradle build config:

buildscript {
  repositories {
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }
  dependencies {
    classpath "io.swagger.core.v3:swagger-gradle-plugin:2.0.8"
  }
}

apply plugin: "io.swagger.core.v3.swagger-gradle-plugin"
apply plugin: 'java'

...

resolve {
  outputFileName = 'ModuleNameAPI'
  outputFormat = 'YAML'
  prettyPrint = 'TRUE'
  classpath = sourceSets.main.runtimeClasspath
  resourcePackages = ['com.company.moduleName.services']
  outputPath = docsDir
}

Here is an example rest service code:

import javax.validation.constraints.NotNull;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;

import io.swagger.v3.oas.annotations.OpenAPIDefinition;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.info.Info;
import org.springframework.beans.factory.annotation.Required;

@Path("serviceName/v1.1")
@OpenAPIDefinition(
   info = @Info( title = "ServiceNameRS", version = "1.1" )
)
public class ServiceNameRS{

   ...

   @GET
   @Path("/someOperation")
   @Produces({"application/json", "application/xml"})
   @Operation
   public ServiceResponse someOperationImpl(@QueryParam("parameterName") boolean parameterName) {
       ...
   }