Using HA Singleton in JBoss 7
Some time ago I had to change standard clustering behavior of Quartz Scheduler, and let it work without synchronizing over database. There are of course a lot of options to do that, but because I’m big...
View ArticleInjecting Spring beans into non-managed objects
Advantages coming from dependency injection can be addicting. It’s a lot easier to configure application structure using injections than doing all resolutions manually. It’s hard to resign from it when...
View ArticleUnderstanding Spring Web Initialization
Few years ago majority of us were used to write XML config files everywhere, to setup even simple Java EE application. Today using Java or Groovy to configure projects is becoming preferred way – you...
View ArticleDebugging OpenJDK
Sometimes debugging Java code is not enough and we need to step over the native part of Java. I spent some time to achieve proper state of my JDK to do that, so short description probably will be...
View ArticleNeed micro caching? Memoization to the rescue
Caching solves wide sort of performance problems. There are many ways to integrate caching into our applications. For example when we use Spring there is easy to use @Cacheable support. Quite easy but...
View ArticleDependency injection pitfalls in Spring
There are three injection variants in Spring framework: Setter-based injection Constructor-based injection Field-based injection Each of those mechanisms has advantages and disadvantages and there is...
View ArticleUsing jstat to report custom JVM metric sets
I’ve always been missing possibility to configure custom headers in JStat. Of course there are a lot of predefined data sets, but it’ll be nicer if we could create our own data set. And as you probably...
View ArticleDo we really still need a 32-bit JVM?
Even today (and it’s 2015) we have two versions or Oracle HotSpot JDK – adjusted to 32 or 64 bits architecture. The question is do we really would like to use 32bit JVM on our servers or even laptops?...
View ArticleJPA in case of asynchronous processing
Few years ago in Java world it was almost obvious that every “enterprise” class project needed JPA to communicate with database. JPA is a perfect example of “leaky abstraction” described by Joel...
View ArticleSmart package structure to improve testability
There are many ways of dividing whole application into packages. Discussions about pros and cons of packaging by feature or by layer can we found on many programming blogs and forums. I want to discuss...
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