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Bernt Johnsen

Bernt M. Johnsen is technical lead on Apache Derby at Sun's Database Technology Group in Trondheim, Norway. He has 5 years database experience (database management, JDBC drivers, distributed SQL execution). Prior work includes internet banking, compilers and expert systems. He has a wife and 3 boys, and likes to climb (indoor, ice, glaciers, rock) and to kayak in his spare time.

 

bernt's blog

Java DB 10.2 beta is now available for download. Try it out!

Posted by bernt on August 12, 2006 at 3:47 PM EDT
Java DB (or Derby, or Cloudscape if you prefer) 10.2 beta is available for download at http://people.apache.org/~rhillegas/10.2.1.0-beta/. There has not been a feature release since august 2005, so this should be what Java DB/Derby users are waiting for.

Do you need to learn how to use transactions? Again?

Posted by bernt on June 6, 2006 at 9:34 AM EDT
Statement: A lot of programmers do not know how to use transactions. You may now think that I miss the target completely, but think for a while.

Very often they (and myself, I admit) think of transactions as atomic changes to the database and write code like

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Open Java DB

Posted by bernt on December 13, 2005 at 3:34 PM EST
Today at ApacheCon in San Diego, Sun's Tim Bray said that Apache Derby will be distributed by Sun as the open Java DB.

Java DB (or Derby) will appear in several Sun products and NetBeans IDE 5.0 will have a Derby (or Java DB) plugin.

So, now we're goi

Apache Derby 10.1.2.1 Released

Posted by bernt on November 24, 2005 at 4:45 AM EST
Apache Derby, the pure Java SQL database, has released version 10.1.2.1. The changes since official release 10.1.1.0 include:
  • Globalization of the 10.1 error messages.
  • Eclipse 3.1 support
  • Ability to run on Mac OS X with no special configuration
  • Support for direc

Database benchmarks

Posted by bernt on October 14, 2005 at 5:03 AM EDT
In response to my A Read-only database in a jar? one of the commenters remarked that "Derby is alright but is much slower than HSQL" and referred to a benchmark at http://jamie.ideasasylum.com/notebook/index.php?id=4.

And guess what?

A Read-only database in a jar?

Posted by bernt on October 3, 2005 at 5:26 PM EDT
In Norway, all wines and liquors and beers stronger than 4.75 volume percent are sold at Vinmonopolet a state monopoly (Literally "The Wine Monopoly").

What has this to do with a read only database? Well, I once had an application on my Palm which contained Vinmonopolet's complete catalogue.

Comments on "Easy String Concatenation Considered Harmful?"

Posted by bernt on September 28, 2005 at 5:15 PM EDT
I received some interesting comments on Easy String Concatenation Considered Harmful? and want to comment some of them.

I too love the easy string concatenation of Java.

Easy String Concatenation Considered Harmful?

Posted by bernt on September 20, 2005 at 8:33 AM EDT
This is not about the amount of String objects generated when you do string concatenation in Java.

JavaZone, Norway

Posted by bernt on September 17, 2005 at 10:09 AM EDT
Since this is my first blog on weblogs.java.net from a small country, Norway, I'll start with a short comment on Norway & Java.

Norway has a population of around 5 million people, no large cities, lots of beautiful nature, has become rich from vast oil resources and fisheries, and does not bother to be a part of the EU.

Small country?