Crashes withot logs when using oauth

[Cheshirre]

Description

Crashes without logs when using authorization type "OAUTHBEARER".

client.OAuthBearerSetToken(token.TokenValue, token.Expiration, **null**);

OS -> Ubuntu Linux, MacOS, etc.
Nuget package: Confluent.Kafka, Version=2.3.0.0

How to reproduce

Reproduces on unix OS family: local or in docker container.
Works on windows.

Set principal to null in client.OAuthBearerSetToken(token.TokenValue, token.Expiration, **null**): https://github.com/confluentinc/confluent-kafka-dotnet/blob/master/test/Confluent.Kafka.IntegrationTests/Tests/OauthBearerToken_PublishConsume.cs

Works, when principal set to empty string.

Checklist

Please provide the following information:

• A complete (i.e. we can run it), minimal program demonstrating the problem. No need to supply a project file.
• Confluent.Kafka nuget version.
• Apache Kafka version.
• Client configuration.
• Operating system.
• Provide logs (with "debug" : "..." as necessary in configuration).
• Provide broker log excerpts.
• Critical issue.

[anchitj]

Can you provide debug logs?

[Cheshirre]

Can you provide debug logs?

There are no logs becouse this issue
#1834

[fabianpersson]

Still an issue. I am unable to provide any logs, since it crashes with exit code 139 (memory violation issue)
OS: Windows 10 (on WSL)/Confluent.Kafka v2.4.0

I was able to get it work with just an empty string however

[shlomiassaf]

Happens to me as well OSX with latest nuget

If principal is set to null it will exit with CODE 139 in with or without a debug session.
If principal is set to an empty string, all is ok.

[ublink]

This is also happening in docker env for me. Works fine outside of docker.

    .SetOAuthBearerTokenRefreshHandler(async (c, p) =>
    {
      try
           {
             var token = await _tokenService.GetTokenAsync();
             if (token != null && !string.IsNullOrEmpty(token.AccessToken))
             {
                var tokenExpiration = DateTimeOffset.UtcNow.AddMinutes(15).ToUnixTimeMilliseconds();
                c.OAuthBearerSetToken(token.AccessToken, tokenExpiration, null);
             }
            else
            {
              c.OAuthBearerSetTokenFailure("Token is null or empty");
            }
          }
          catch (Exception ex)
          {
            _logger.LogError(ex.Message);
            c.OAuthBearerSetTokenFailure($"Token retrieval failed: {ex.Message}");
           }
 });

[danwkennedy]

I have a PR out to validate inputs for these mandatory parameters. That'll keep null from failing silently.