| JiraRestClientCallWrapper | Common class to wrap all calls to the JiraRestClient, and do some custom Exception handling |
| JiraClientAuthenticationException | Similar to JiraClientAuthorizationException, but specifically for use when authentication is required and has failed or has not yet been provided. |
| JiraClientAuthorizationException | The request was a valid request, but the server is refusing to respond to it. |
| JiraClientOperationNotSupportedException | Exception to represent an error while trying to invoke an action on a Jira instance that doesn't support it In general, it means that you are connecting to an instance with an old version (below 5) |