Last week I was working on a web crawler to crawl 250,000 URLs each night.  We had 5 client crawlers running and connecting to a master MSSQL 2013 database.  FusionGronker in ##coldfusion on freenode recommended that I try FusionReactor (a tool that allows you to monitor EVERYTHING that’s going on in your Java (ColdFusion) servers in real time. After many hours of debugging, I noticed every hour or so, a thread was getting stuck in a Native Method call.  There was no way to kill the thread, since it was…

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