How to get all executionworkitem in testplan using RQMUrlUtility

The RQM URL Utility is a Java-based command line utility for invoking the RQM Reportable REST API (see https://jazz.net/wiki/bin/view/Main/RqmApi).  Simply put, it's a HTTP client with some RQM Reportable REST API-specific support.  It's intended to be sample tooling.  Unfortunately, the RQM URL Utility does not support request parameters, which are required to query for TCERs (test case execution records or execution work items) associated to a test plan.  For this, you need fields filtering (see https://jazz.net/wiki/bin/view/Main/RqmApi#fields):

<feedUrl>?fields=feed/entry/content/executionworkitem/(testplan[@href='<resourceUrl>']|*)

I would suggest using a different HTTP client (e.g. https://jazz.net/wiki/bin/view/Main/RqmApi#Code_Examples) and fields filtering.