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The depths of Java: API leak exposed through covariance

Java can be very tricky some times, especially in API design. Let’s have a look at a very interesting showcase. jOOQ strongly separates API from implementation. All API is in the ...
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NetBeans Usability Tips

Java IDEs have come a long way since the days of JBuilder (though JBuilder seemed like a welcome advance at the time). Today’s Java IDEs (such as NetBeans, Eclipse, IntelliJ ...
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The Visitor Pattern Re-visited

The visitor pattern is one of the most overrated and yet underestimated patterns in object-oriented design. Overrated, because it is often chosen too quickly (possibly by an architecture ...
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Maven Build Dependencies

Maven and Gradle users who are familiar with release and snapshot dependencies may not know about TeamCity snapshot dependencies or assume they’re somehow related to Maven (which ...
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Implementing the State Machine Pattern as a Stream Processor

In my last blog, I said that I really thought that some of the Gang Of Four (GOF) patterns were becoming somewhat obsolete, and if not obsolete then certainly unpopular. In particular ...
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Java 7: Closing NIO.2 file channels without loosing data

Closing an asynchronous file channel can be very difficult. If you submitted I/O tasks to the asynchronous channel you want to be sure that the tasks are executed properly. This can ...
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NetBeans 7.1: Create a Custom Hint

I have talked about some of my favorite NetBeans hints in the posts Seven NetBeans Hints for Modernizing Java Code and Seven Indispensable NetBeans Java Hints. The fourteen hints covered ...
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What’s Cooking in Java 8 – Project Jigsaw

What is Project Jigsaw: Project Jigsaw is the project to make the java compiler module aware. For years java API has been monolithic, i.e. the whole API was seen from any part of the ...
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JUnit and Hamcrest: Improving On assertEquals

In my blog post Are Static Imports Becoming Increasingly Accepted in Java?, I discussed the increasing use of static imports in Java to make code more fluent in certain contexts. Unit ...
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Secure Encryption in Java

Last time I wrote about cryptography, I outlined Apache Shiro crypto API and shown how to use its two symmetric ciphers. I also wrote that “You do not need more to encrypt and ...
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