A famous quote, wrongly attributed to Mark Twain, is that "the coldest winter I ever spent was a summer in San Francisco." JavaOne attendees have been caught by this before, packing light for presumed California warmth, only to be surprised by the cold and the wind. So, of course, repeat JavaOne attendees learned from their mistakes and many of us packed warm for this year.

And got really surprised when it was a sunny 85F/29C yesterday, wildly above the average of 66F/19C for this time of year.

But then again, why be outside on a beautiful day when everything good is going on underground, in the lower-level conference halls of the Moscone Center? Monday was CommunityOne, a Sun-sponsored free event that in many ways was an outgrowth of NetBeans Day, just with a number of other tracks (GlassFish, OpenJDK and ME, OpenSolaris) folded in. For not officially being part of JavaOne, attendance was impressive, with a crowd of thousands on hand.

Your editor spent a good part of the day helping to set up the java.net booth for the Community Corner mini-talks, which start today (and for which there are still a few open slots, particularly on Thursday, for last minute speaker sign-ups). I also had to attend an O'Reilly meeting at an office up on Lombard, far away from the show.

One event I did attend was the Java Posse Podcast 119, presented live on stage as lunchtime entertainment for the CommunityOne crowd. Responding to feedback that they've tended to shy from controversy, they took on some topics head-on, by including in their wish lists and predictions, a list of things they'd like to see removed from Java in the next version, including a few sacred cows of a few people here and there, including CORBA and AWT. They also got a number of cheers (listen to the podcast, which is already up) when one of the things they said they wanted to get rid of is "paper architects", adding "if you can't code, retire." The colleague I was sitting next to said "man, we've got 16 of those where I work!"

Featured on today's front page:

• Cay Horstmann: Java One Day 0
• Arun Gupta: CommunityOne/GlassFish Day Report]
• Java Posse #119 - Special from Community One, May 7th 2007
• Felipe Gaucho: If you can't code, retire.
• Jim Hurley: Opening Day... My Top Five Session Picks
• Alexandre Gomes: Talking about Cool Stuffs at JavaOne 2007
• Timothy M. O'Brien: JavaOne: What are your Questions?
• John O'Conner: Java University: Building Dynamic Web Sites with Ajax and Dojo
• Malcolm Davis: JavaOne Blog 1: JavaOne, Again
• Qusay H. Mahmoud: NetBeans Mobility
• Michael Nascimento Santos: A public pledge to NetBeans
• Gregg Sporar: NetBeans Day San Francisco, 2007
• Sean Brydon: JavaOne 2007 talk on Blueprints for Mashups: Practical Strategies, Tips, and Code for Designing and Building
• Chet Haase: Life's Rough
• Jonathan Simon: How I got here

Today: the opening keynote, the platform road-map keynote, and the first technical sessions. Enjoy the show, and please stop by the java.net booth when you get a chance.