What is JMX and how does it work?

Java Management Extensions (JMX) is a standard component of the Java Platform. JMX gives developers a standard and simple way to manage resources, including services, devices, and applications. It is dynamic, making it possible to manage and monitor resources as soon as they are created, implemented or installed.

What is JMX API?

The Java Management Extensions (JMX) API is a standard API for management and monitoring of resources such as applications, devices, services, and the Java virtual machine. Accumulating statistics about application behavior and making them available. Notifying of state changes and erroneous conditions.

What protocol does JMX use?

The JMX Messaging Protocol (JMXMP) connector is a configuration of the generic connector where the transport protocol is based on TCP and the object wrapping is native Java serialization. Security is more advanced than for the RMI connector.

Does JMX impact performance?

In general running the JVM with JMX enabled does not incur in appreciable performance hits. The performance hit happens only when a tool like jconsole is connected and actually polling for information.

What is JMX connection?

Java Management Extensions (JMX) technology can be used to monitor and manage any Java technology-based applications (Java applications) that are running in either a local or a remote Java Virtual Machine (JVM). VisualVM is one such JMX client application.

How do I use JMX monitoring?

To monitor a Java platform using the JMX API, you must do the following.

1. Enable the JMX agent (another name for the platform MBean server) when you start the Java VM. You can enable the JMX agent for:
2. Monitor the Java VM with a tool that complies to the JMX specification, such as JConsole.

Does JMX use HTTP?

Jolokia is remote JMX with JSON over HTTP. It is fast, simple, polyglot and has unique features. It’s JMX on Capsaicin. Jolokia is a JMX-HTTP bridge giving an alternative to JSR-160 connectors.

What is JMX attribute?

According to the JMX specification, an MBean interface consists of named and typed attributes that are readable and possibly writable, and named and typed operations that can be invoked by the applications that are managed by the MBean.

What port does JMX use?

The default port for secure JMX access is 9875 and the default username and password are admin and springsource .

What is JMX monitor?

Java Management Extensions (JMX) is a specification for monitoring and managing Java applications. It enables a generic management system to monitor your application; raise notifications when the application needs attention; and change the state of your application to remedy problems.

What is JMX memory?

Java Management console (JMX) connects to a running JVM and collects and displays key characteristics in real time. It is a tool for monitoring and managing a running JVM instance. The tool presents live data about memory and CPU usage, garbage collections, thread activity, and so on.

What is JMX agent?

A Java Management Extensions (JMX) agent is a management entity that runs in a Java Virtual Machine (Java VM) and acts as the liaison between the MBeans and the management application. The various components of a JMX agent are outlined in the following sections: “MBean Server”