jtop

A terminal application that monitors Java applications over JMX. Uses NCURSES to graphically monitor activity.

Written in Scala.js for Node.js.

Requirements

jtop requires Node.js and certain modules. To run the demo you will also need the scala command installed.

Here are the command to install Node (requires Homebrew) and the necessary modules.

brew install node
npm install jmx blessed blessed-contrib

You will also need a terminal supporting full xterm colors.

Running jtop

To start, you'll need a Java application to monitor. Run the following commands in the terminal to enable JMX monitoring and then start a Scala REPL that will be busy sorting strings and juggling threads.

export JAVA_OPTS="-Dcom.sun.management.jmxremote.port=8855 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"

scala -e 'import scala.concurrent.ExecutionContext.Implicits.global; import scala.concurrent.Future; while(true) { Future { for (i <- 1 to util.Random.nextInt(20)) { println("processing"); val l = (1 to 100000).map(_.toString).toList;  util.Random.shuffle(l).sorted; Thread.sleep(util.Random.nextInt(2000)); }; }; Thread.sleep(util.Random.nextInt(4000)) }'

Then, in a separate (and colorful!) terminal execute run.sh.