Java Tools Tutorials - Herong's Tutorial Notes - Version 5.32, by Dr. Herong Yang
Monitoring Thread Status as Timeline
This section provides a tutorial example on how to monitor the status of each thread in timeline or table format.
To monitor the status of each individual thread, you can use the Threads tab on Java VisualVM.
1. Start Java VisualVM and connect to the running JVM of LongSleep.java.
2. Click on the Threads tab. The thread screen is displayed with 3 sub tabs:
- Timeline - Display status history of each thread, using different colors for different statuses.
- Table - List all threads with their status statistics.
- Details - Displays each thread with more detailed information.
3. Wait for some time, and click on the Timeline tab. You will all threads in the LongSleep.java. The "main" thread is sleeping as expected. But there are 4 threads always running: RMI TCP Accept-0, Attach Listener, Signal Dispatcher, and RMI TCP Connection(4). I guess there are running to serve monitoring requests from this Java VisualVM.
Here is a picture showing the threads timeline view on Java VisualVM:
Last update: 2015.
Table of Contents
'javac' - The Java Program Compiler
'java' - The Java Program Launcher
'jconsole' - Java Monitoring and Management Console
'jstat' - JVM Statistics Monitoring Tool
►jvisualvm (Java VisualVM) - JVM Visual Tool
What Is jvisualvm (Java VisualVM)?
jvisualvm Command to Open Dump Files or Conections
Connecting Java VisualVM to a Local JVM Process
Monitoring Usgaes of CPU, Heap, Classes and Threads
►Monitoring Thread Status as Timeline
Taking Thread Dump to See Thread Stack Traces
Taking Heap Dump to See Memory Usages
Connecting to Remote JVM Processes
Avaible Plugins and Installation
'javap' - The Java Class File Disassembler
'keytool' - Public Key Certificate Tool