Two exceptions caused hang/infinite loop in QueryBuilderCommon.java #27
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executeRequest needs to close the request before throwing an exception. Otherwise there will be no open connections to use after two exceptions are thrown. I discovered this running the BlockCommandTest.java without changing the hash used for specific block retrieval.
This comment helped me figure it out. https://stackoverflow.com/questions/33650157/httpclient-stop-executing-the-same-httpget-method-in-a-loop-after-executing-twic/33650384#33650384