The document discusses tools for monitoring and managing Java applications and devices using JMX and SNMP technologies. JMX allows building distributed, web-based solutions for monitoring and managing applications and networks. SNMP is commonly used to monitor network devices. The document then covers JConsole and JMX consoles for visualizing JMX data from local or remote Java applications, with an emphasis on monitoring JBoss Application Server using tools like JConsole, VisualVM, and JBoss' twiddle command-line tool.