ClassCastException handling a 204 response with empty body

[hummer-hpe]

Steps to reproduce

What steps can reproduce the defect?
Please share the setup, sample project, version of Java etc.

Occasionally, when querying for azure utilization by subscription by customer, the PartnerServiceClient.handleResponse method throws a ClassCastException. This occurs when a 204 response is handled with an empty body. Here's an example query:

ResourceCollection<AzureUtilizationRecord> records = api.getCustomers()
                     .byId(customerId)
                     .getSubscriptions()
                     .byId(subscription.getId())
                     .getUtilization()
                     .getAzure()
                     .query(startTime, endTime, AzureUtilizationGranularity.HOURLY, true, 1000);

Here's where PartnerServiceClient.handleResponse triggers the exception:

response = httpClient().newCall(request).execute();
if(response.isSuccessful())
{
	responseBody = response.body().string();
	if(StringHelper.isNullOrEmpty(responseBody))
	{
		value = (T)response;  // <--- THIS CAUSES ClassCastException
	}
	else
	{
		value = getJsonConverter().readValue(responseBody, responseType);
	}
	response.close();
	return value; 
}

Expected behavior

Share the expected output

I'd expect a null to be returned, or some form of not found exception to be thrown, but never a class cast exception, especially for a 204 response, which is defined as not having a response body.

Actual behavior

What is the behavior observed?

ClassCastException is thrown.

Diagnostic logs

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Environment

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Version

Observed this behavior with both versions 1.13.2 and 1.15.3, and I see that the latest code on master (1.15.4) will do the same.

[thebitmuncher]

Appears to be the same as issue:
microsoft/Partner-Center-Java-Samples#10