go build fails with go1.16.4 because of missing go.mod file

[de-jcup]

Situation

Executing integration tests with

./gradlew integrationtest

on my local machine fails with:

> Task :sechub-cli:buildGo FAILED
Build go:Start building package 'daimler.com/sechub'
>building:platform/linux-386
no required module provides package daimler.com/sechub: go.mod file not found in current directory or any parent directory; see 'go help modules'
Go build failed because of an error

Checking version:

> $ go version
go version go1.16.4 linux/amd64

Wanted

Build shall work with newer go versions as well - e.g. for security reasons (compiler output

Solutions

There a two possible options IMHO:

A) integrate adequate go.mod file which works for 1.15.x and also 1.16.x
B) Make a workaround via setting GOPATH ala
GOPATH="~/go:./sechub-cli" inside the gradle build file

[de-jcup]

Some interesting links:

• Discussions about the need of an go.mod file when no external dependencies: see cmd/go: rethink "missing go.mod" mode golang/go#32027
• Similar discussion at : cmd/go: allow go run . in module mode without a go.mod file golang/go#36513