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Tomcat 8 on Debian Jessie with PSI Probe and OpenNMS to monitor performance (Part 1)

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This is the first of three posts about the latest version of Apache Tomcat, still the most widely used application server, on Debian Jessie, with PSI Probe to manage it and OpenNMS to monitor its up-time.

What's new in Tomcat 8? Debian Jessie was released with Apache Tomcat 8, which provides the following:
Java Servlet 3.1, an incremental release of the servlet specification that includes non-blocking I/O to improve scaleability and an HTTP protocol upgrade mechanism that allows the client and the server to negotiate a transition from HTTP 1.1 to some other new chosen protocol;JavaServer Pages 2.3, a maintenance release to provide support for Expression Language (EL) 3.0 and to use the functionality of the Servlet 3.1 API; Java Unified Expression Language (EL) 3.0, which allows EL to run in a standalone mode outside of servlets or JSPs, plus lambda expressions and other Java 8 goodies;WebSocket 1.1, which allows full duplex communications over TCP so that bidirectional data can flo…