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JConsole – Java Monitoring Console

JConsole is a GUI Java monitoring tool. Using the tool, we can profile the JVM and obtain information about Java application performance and resource consumption.

Tool Features

We can monitor:

Heap memory/Non-Heap memory usage
Number of loaded classes
Number of Threads
CPU Usage, etc.
Perform Garbage collection

The tool can be found under the bin directory of the JDK home directory.

%JAVA_HOME%\bin

JConsole New Connection

To start the tool, type the following command:(Assuming JDK appended to the PATH environment variable on the machine)

\> jconsole

The new connection window has two options:

Local Process
Remote Process

Local monitoring

A local process is used to monitor local Java applications that are running on the local machine.

We can attach JConsole to a local process from the list in the JConsole new connection wizard. Alternatively, we can specify the local process’s PID to attach JConsole.

\> jconsole pid

JConsole Java Monitoring Console

Remote monitoring

The remote process is used to monitor remote Java applications that are running on the remote machine. For example, we can connect to the Java applications that are running on the JBoss Application Server machine from the workstation PC.

To start and attach JConsole to a remote process for remote monitoring, we need to use the hostname and the port.

\> jconsole hostname:port

We can also connect to remote JMX agents using the JMX service URL.