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Xero-Java 3.1.8 "HTTPS hostname wrong" exception after 5 second delay between API calls

Started by James Dean -   in Wrapper libraries

I have implemented the Xero-Java SDK 3.1.8, specifically the OAuth2.0 implementation, into an ongoing project. I was able to authorise and receive access and refresh tokens, and access the Xero Accounting API.

However, if I hit the Accounting API for example and receive a result, wait 5 seconds or more, then hit it again, I receive the exception:
java.io.IOException: HTTPS hostname wrong: should be <api.xero.com>

If I do it in less than 5 seconds, it works every time without exceptions.

I am initiating the Accounting API in the following manner:
ApiClient apiClient = new ApiClient(null, null, null, null, null);
AccountingApi accountingApi = AccountingApi.getInstance(apiClient);

An example Accounting API call looks like the following:
Contacts contacts = accountingApi.getContacts(theAccessToken, theTenantId, null, null, null, null, null, null);

As you can see I'm not overriding any defaults with the hostname settings so they shouldn't change from call to call. Is there something else I'm missing here?