Introduction to the Oracle Java Mission Control that was released in 7u40.

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

2. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.2
Java Mission Control
Roger Brinkley
Java Technology Ambassador
Oracle, Corp.

3. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.3 Copyright © 2013, Oracle and/or its affiliates. All rights reserved.
Agenda  Overview
 Installation and Usage
 Tools Walk Through

4. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.4
OVERVIEW

5. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.5
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

6. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.6
Supported Platforms
Client Server
Windows Windows
Linux [x86,x64] Linux [x86,x64]
MacOSX [x64] MacOSX [x64]
Solaris [x86,x64,SPARC]

7. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.7
Main Tools
 Management Console
– Most comprehensive JMX Consoles available
 Flight Recorder
– Built in, high performance JVM event recorder

8. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.8
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!

9. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.9
INSTALLATION AND USAGE

10. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.10
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/

11. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.11
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

12. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.12
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

13. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.13
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

14. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.14
Starting the management agent
 Use the com.sun.management.jmxremote properties as normal
http://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=true
com.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

15. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.15
TOOLS WALK-THROUGH

16. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.16
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

17. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.17
JMX CONSOLE DEMO

18. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.18
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

19. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.20
FLIGHT RECORDER DEMO

20. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.21
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

21. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.22
Public Resources
Homepage:
http://oracle.com/missioncontrol
Forum:
http://forums.oracle.com/communitydeveloper/english/java/java_hotspot_virtual_ma
chine/java_mission_control
Twitter:
@javamissionctrl
@hirt
Blog:
http://hirt.se/blog
Facebook:
http://www.facebook.com/pages/Java-Mission-Control/275169442493206

22. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.23
The preceding material is intended to outline our
general product direction. It is intended for
information purposes only, and may not be
incorporated into any contract. It is not a commitment
to deliver any material, code, or functionality, and
should not be relied upon in making purchasing
decisions. The development, release, and timing of
any features or functionality described for Oracle’s
products remains at the sole discretion of Oracle.

23. Copyright © 2013, Oracle and/or its affiliates. All rights reserved.24