Java Mission Control in Java SE 7U40

Copyright © 2013, Oracle and/or its affiliates. All rights reserved.1


Java Mission ControlRoger BrinkleyJava Technology AmbassadorOracle, Corp.

Copyright © 2013, Oracle and/or its affiliates. All rights reserved.3Copyright © 2013, Oracle and/or its affiliates. All rights reserved.

Agenda Overview Installation and Usage Tools Walk Through


OVERVIEW


Purpose and Design

The JDK profiling and diagnostics tools platform A tools suite for production use (fine in development too)

– Real time monitoring of key indicators and events– Production time profiling and diagnostics

Focus on low overhead– Built into the JVM– Already available runtime information– High performance implementation


Supported Platforms

Client ServerWindows Windows

Linux [x86,x64] Linux [x86,x64]

MacOSX [x64] MacOSX [x64]

Solaris [x86,x64,SPARC]


Main Tools

Management Console – Most comprehensive JMX Consoles available

Flight Recorder– Built in, high performance JVM event recorder


Origins

Originally a JRockit JVM based tools suite (known as JRockit Mission Control)

– JRockit and HotSpot convergence => Java Mission Control– For JRockit – use JRockit Mission Control 4.1– For HotSpot – use Java Mission Control 5.2 or later

Now distributed with the JDK in 7u40!


INSTALLATION AND USAGE


Java Mission Control installation

JMC stand alone client– Simply download and install the JDK (>=7u40)– Same /bin directory as java, javac, etc

Eclipse version– Install from update site on OTN:

http://download.oracle.com/technology/products/missioncontrol/updatesites/base/5.2.0/eclipse/


Experimental Plug-ins

Already configured for use in the stand alone client– Choose Help | Install New Software…

Eclipse version– Install from update site on OTN:

http://download.oracle.com/technology/products/missioncontrol/updatesites /experimental/5.2.0/eclipse/

Note that experimental plug-ins are:– Not as thoroughly tested– Not supported


Starting the Java Mission Control Client

Just double-click on the launcher in bin– On Mac OSX it’s more complicated

The logging settings file (in java.util.logging format) can be specified from the preferences

– Window | Preferences | Java Mission Control | Logging Settings File More info on http://hirt.se/blog/?p=281


Starting the server

To be able to access Flight Recorder-XX:+UnlockCommercialFeatures -XX:+FlightRecorder

There are plenty of command line options for controlling Java Flight Recorder

– Some examples can be found on http://hirt.se/blog


Starting the management agent

Use the com.sun.management.jmxremote properties as normalhttp://docs.oracle.com/javase/7/docs/technotes/guides/management/agent.html

Don’t forget – rmi registry and server port can be set to the same port – good for tunneling! (>=7u4)

com.sun.management.jmxremote.rmi.port To broadcast the presence of the agent on the network (7u40):

com.sun.management.jmxremote.autodiscovery=truecom.sun.management.jdp.name=mygroup/MyJVM (optional)

Sometimes RMI will get the hostname wrong:java.rmi.server.hostname=<hostname client should use>

For remote access


TOOLS WALK-THROUGH


The JMX Console Highlights

Simple but feature rich JMX Console– JConsole on steroids

Real time monitoring of key indicators Triggers

– Simple rules engine– Developer/System Admin can provide custom actions

Various experimental plug-ins– Oracle Coherence– JConsole plug-in support


JMX CONSOLE DEMO


Flight Recorder Highlights

High performance JVM event recorder Produces binary recordings Recordings are self describing and self contained chunks Recordings contain runtime profile information The recorder can be running continuously

– Whenever something happens, the data can be dumped

– A bit like having a ”black box” for the JVM More on Flight Recorder in another screencast


FLIGHT RECORDER DEMO


Experimental Plugins

WLS Plug-in DTrace Plug-in

– Extended DScript language to produce self describing events– Visualization similar to Flight Recorder

JOverflow– Tool for analyzing heap waste (empty/sparse collections)– Uses hprof dumps– First stab at using JavaFX for visualization in a JMC plug-in


Public Resources

Homepage:http://oracle.com/missioncontrol

Forum:http://forums.oracle.com/communitydeveloper/english/java/java_hotspot_virtual_machine/java_mission_control

Twitter:@javamissionctrl@hirt

Blog:http://hirt.se/blog

Facebook:http://www.facebook.com/pages/Java-Mission-Control/275169442493206


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