I sadly could not make it to EclipseCon last year. It was sad for so many reasons, not the least being that Sweden during that part of the year is cold and dark. 😉 This year, however, I will be contributing two talks:

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HotRockit – What to Expect from Oracle’s Converged JVM

Oracle is converging the HotSpot and JRockit JVMs to produce a "best of breed JVM". Internally the project is sometimes referred to as the HotRockit project. There is already a large influx of ideas and solutions provided by the JRockit JVM into the Open JDK.

Examples of improvements include:

• Better monitoring and profiling
• Improved performance
• Better ergonomics

This talk will discuss what to expect from the converged JVM over the next two years, and how this will benefit the Eclipse community.

Production-time Problem Solving in Eclipse

This session will look at some common problems and pitfalls in Java applications. The focus will be on non-invasive profiling and diagnostics of running production systems. Problems tackled will be:

• Excessive GC

• Finding hotspots and optimizing them

• Optimizing the choice of data structures

• Synchronization problems

• Finding out where exceptions are thrown

• Finding memory leaks

All problems will be demonstrated and solved running both the bad-behaving applications and the tools to analyze them from within the Eclipse Java IDE.

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I hope to meet you there!

Soon JavaOne, Oracle Develop and Oracle Open World will be here – this time at the same time and the same place! The huge conference(s) will take place in San Francisco September 19 – 23. This year JRockit will be represented in all three conferences. Here are two tables I’ve put together with all (AFAIK) JRockit related talks.

The sessions where JRockit team members are directly involved are:

I’m presenting at the following sessions: S317468, S318579 and S313785.

Other sessions that seem to be JRockit related are:

Please let me know if I’ve missed any JRockit-related sessions!

For more information, check the content catalog.

HOL = Hands On Lab – you get hands on experience with the technology in front of a computer. Tutorials.
CS = Conference Session – traditional conference talk.
J1/OD = Java One/Oracle Develop
OOW = Oracle Open World

Writing the JRockit book has made me take trips down memory lane more than once. The last read through made me think of one of the more embarrassing bugs we’ve had in JRockit Mission Control. Since it’s too late to add content to the book – most of the chapters are already finalized, or in the process of being finalized -  I thought I’d just put it here on the blog. 🙂

So, one of the more embarrassing bugs in Mission Control would be when an attibute was misspelt in the Management Console. An attribute ending with the word count lacked the letter ‘o‘. The bug report stated that the "customer was not amused".

I couldn’t help being slightly amused though.

The next major release of JRockit is finally out! Here are some highlights:

• Includes the all new JRockit Flight Recorder – supersedes the old JRockit Runtime Analyser. The new flight recorder is inspired by the “black box” in airplanes. It uses a highly efficient recording engine and thread local buffers to capture data about the runtime and the application running in the JVM. It can be configured to always be on, so that whenever anything “interesting” happens, data can be dumped for some time back. Think of it as your own personal profiling time machine.
• Automatic shortest path calculation in Memleak – no longer any need for running around in circles when trying to find your way back to a thread root from an instance.
• Memleak can now show class loader related information and split graphs on a per class loader basis.
• More easily configured JMX agent – default port for both RMI Registry and RMI Server can be configured, and is by default the same, allowing easier configuration of firewalls.
• Up to 64 GB (was 4GB) compressed references.
• Per thread allocation profiling in the Management Console.
• Native Memory Tracking – it is now possible to track native memory allocations with very high resolution. The information can either be accessed using JRCMD, or the dedicated Native Memory Tracking experimental plug-in for the Management Console (alas only available for the upcoming 4.0.1 release).
• JRockit can now produce heap dumps in HPROF format.
• Cooperative suspension – JRockit is no longer using system signals for stopping threads, which could lead to hangs if signals were lost or blocked (for example bad NFS shares). Now threads check periodically to see if they are suspended.
• VPAT/Section 508 compliant JRMC – greatly improved keyboard navigation and screen reader support.

See New and Noteworthy for more information.

JRockit Mission Control 4.0.0 can be downloaded from here:
http://www.oracle.com/technology/software/products/jrockit/index.html

I recently got tired of monitoring the weather for various locations to find a nice time and spot to fly my planes. Enter WindBot. WindBot sends me an e-mail whenever new opportunities are found:

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The WindBot@hirt.se has found changes to the available flying opportunities for you in Trollbäcken:

New opportunities:
==================
Friday 15:00 (2010-04-23) [wind 2.0m/s, precipitation 0.0mm, cloud cover 43.0%]
Friday 22:00 (2010-04-23) [wind 2.0m/s, precipitation 0.0mm, cloud cover 100.0%]

Lost opportunities:
===================

Triggering condition was:
MicroPlaneFlyCondition [wind speed <= 2.0, precipitation <= 1.0, 5 <= time <= 22]

/WindBot v0.0.3

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Lovely! 🙂