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Vaadin add-ons and Maven

Introduction One (of the many) thing I like about Vaadin, is its community of ‘add-ons’ to the Vaadin framework – what they call the Vaadin Directory. An ‘add-on’ is a community-contributed ...
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Concurrency optimization – Reduce lock granularity

Performance is very important in high load multi-threaded applications. Developers must be aware of concurrency issues in order to achieve better performance. When we need concurrency ...
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Apache Shiro : Application Security Made Easy

Considering that JAVA is over 10+ years old, the number of choices for application developers that need to build authentication and authorization into their applications is shockingly ...
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Java EE6 Events: A lightweight alternative to JMS

The feature I’m going to talk about today is the event mechanism that is in java EE 6. The general idea is to fire an event and let an event listener pick it up. I have created this ...
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Monitoring OpenJDK from the CLI

Currently I do quite a bit of work in and around the Java virtual machine (JVM), most of the time on Linux. When things go awry and I am trying to establish why, I reach for the Java ...
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Programming antipatterns

 Did you ever do a code review where you recorded an extremely high amount of WTF/m? And did you ever wonder what the cause of all this bad code is? Most of the time cause number ...
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Sending emails with Java

I start writing this post as a simple “how to send an email” using Java, but later I found I need to briefly explain more things. So, here is this kind of all in one summary about ...
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Oracle WebLogic Java Cloud Service – Behind the scenes.

More on the Open World side of happenings one big and probably unexpected announcement was that Oracle is finally supporting the cloud movement and offering their own public cloud service. ...
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Spring MVC Interceptors Example

I thought that it was time to take a look at Spring’s MVC interceptor mechanism, which has been around for a good number of years and is a really useful tool. A Spring Interceptor ...
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Java EE Past, Present, & Cloud 7

One prominent topic of the recent JavaOne 2011 was the next major Java EE 7 release. As stated in the keynotes, the work on it is well underway. It will contain the 28 specifications ...
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