update java example for managedidentity using azure-identity library and latest dependency versions [FEATURE REQ]

[tristanexsquare]

Is your feature request related to a problem? Please describe.
We wanted to use the latest version of the azure-identity library to implement managedidentity authentication over kafka api. The java example included in this repository only shows the approach using the old azure-client-authentication library. When we tried to simply replace the azure-client-authentication with azure-identity, we encountered the following issue:

Requesting a token for scope "https://mynamespace.servicebus.windows.net" failed. After investigating the issue we found out that we had to add "/.default" as suffix to the requested scope.

Another problem we encountered was the usage of the outdated java version 1.7. We would expect to use the latest java and dependency versions.

Describe the solution you'd like
We would like to have an example that:

• shows the usage of the azure-identity library
• is working (adds the '/.default' suffix to the requested scope
• has java version and all dependencies updated

Describe alternatives you've considered
none

Additional context
none

Information Checklist

• Description Added
• Expected solution specified

[joshfree]

@billwert could you follow up with @tristanessquare on this azure-identity documentation/sample improvement?

[tristanexsquare]

I think this issue should have been created under https://github.com/Azure/azure-event-hubs-for-kafka. I have already created a PR for this improvement there: Azure/azure-event-hubs-for-kafka#234

Is it possible to move this issue or should I create a new one there and close this issue?

Thank you for your support.

[billwert]

hey @tristanessquare!

Thanks for making the PR. It is probably easiest to just make a new issue over there. Thank you!