HSQLDB “database already in use by another process” exceptions on UNIX
Posted by Andrew Phillips mid-afternoon: March 20th, 2009
Installing a simple Grails application in Tomcat on Linux should really have been the most straightforward of tasks. Instead, I spent a progressively more frustrating morning chasing down a "helpful" feature of HSQLDB that was causing the startup to fail with
org.hsqldb.HsqlException: The database is already in use by another process: org.hsqldb.persist.NIOLockFile@6b67bdbe[file =/myDb.lck, exists=true, locked=false, valid=false, fl=null]
exceptions. To save others from a similar waste of time, here's the cause and a workaround: (more...)
Best of Xebia Offtopic List: Mice in the Office
Posted by Erwin van der Koogh at around evening time: September 27th, 2007
Hello everyone,
Today I would like to make an exception to not report our usual serious, high quality discussions on our technical list, but to bring you a gem on our offtopic list. The original discussion was in Dutch because it was sent to the dutch mailing list, but I will try to translate, if only for our Indian and French coworkers who had to witness the Dutch on the offtopic list, where it was quickly taken..
Apologies in advance for any translation errors..
Best of Xebia tech list: Hibernate Cascade Question
Posted by Erwin van der Koogh in the early afternoon: September 21st, 2007
I am sorry I am a bit behind on posting the techlist questions, but I have been a bit busy lately with tons of different projects.
This time we have a hibernate question..
Best of Xebia tech list August 2007: Magic number 28232
Posted by Erwin van der Koogh around lunchtime: August 15th, 2007
We have had a number of very interesting discussions on our techlist in the last week or so, so I thought it best to get started as soon as possible. The reason I choose this particular thread is that it is a very technical thread, but it's very hard to find any information about it online. Oh, and it's not about Java or Agile for a change!
This thread quickly rose to about 20 mails, so I have made a selection to keep it readable. (more...)
Best of Xebia tech list July 2007: Accuracy of System.getCurrentTimeMillis()
Posted by Erwin van der Koogh in the early afternoon: August 3rd, 2007
At Xebia we have an internal mailing list where a lot of interesting technical discussions take place. Because we have a passion for knowledge sharing, we thought we'd give you a glimpse of some recent topics. This is the first of a series we plan to do.
We choose this particular mail thread because it answers a technical question a lot of people might have. And it also introduces a little known feature of Java 5.
| From | Jan Vermeir |
|---|---|
| Subject | Accuracy of System.getCurrentTimeMillis() |
| Date | Mon 23/07/2007 15:51 |
|
Hi, we're measuring elapsed time for processing a message. each measured operation takes a couple of milliseconds, so I was wondering what the accuracy of System.getCurrentTimeMillis() is. I have some vague recollection about accuracy not actually being milliseconds, as the name would suggest, and that it may vary with platform and JVM vendor. Does anyone know for sure? Jan. |
|
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