Tag Archives: java

JPA + ObjectDB example

Posted on 02/12/2013 by dariusz.cieslak

JPA stands for "Java Persistence API" – an API that tries to replace direct Hibernate (or other ORM) usage with more generic layer that allows to replace underlying ORM with no application code changes. Although ORM (object relational mappers) typically … Continue reading →

Posted in en | Tagged , , | Comments Off on JPA + ObjectDB example

ConfigurationException: XML-22101: (Fatal Error) DOMSource node as this type not supported

Posted on 23/06/2010 by dariusz.cieslak

When you setup your project with commons-configuration library plugged in sometimes you can get very misleading error: ConfigurationException: XML-22101: (Fatal Error) DOMSource node as this type not supported This error may be caused by missing XML library bindings. In order … Continue reading →

Posted in en | Tagged | 4 Comments

Is Static Typing the Root of All Evil?

Posted on 16/05/2010 by dariusz.cieslak

Anders Janmyr has written recently an interesting article why he hates static typing: Donald Knuth wrote in his famous paper Structured Programming with go to Statements (PDF) We should forget about small efficiencies, say about 97% of the time: pre-mature … Continue reading →

Posted in en | Tagged | 1 Comment

commons-logging.jar considered harmfull?

Posted on 01/05/2010 by dariusz.cieslak

During recent 2nd level cache implementation research I noticed EHCache has a very funny dependency: slf4j. Hey, WTH, yet another log library implementation? – I asked myself. No commons-logging as everywhere? I googled around and found "The evils of commons-logging.jar … Continue reading →

Posted in en | Tagged , | Comments Off on commons-logging.jar considered harmfull?

How To Debug JNDI Lookup Problems

Posted on 30/04/2010 by dariusz.cieslak

Sometimes when you get an exception like this: javax.naming.NameNotFoundException: Name "comp/UserTransaction" not found in context "java:" you want to see what entries are visible in JNDI. No problem, place this code somewhere near lookup problem code location: InitialContext ic = … Continue reading →

Posted in en | Tagged , | 1 Comment