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Java concurrency: the hidden thread deadlocks

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Most Java programmers are familiar with the Java thread deadlock concept. It essentially involves 2 threads waiting forever for each other. This condition is often the result of flat (synchronized) or ReentrantLock (read or write) lock-ordering problems.                 Found one Java-level deadlock: ============================= "pool-1-thread-2": waiting to lock monitor 0x0237ada4 (object 0x272200e8, a java.lang.Object), ...

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Spring Framework: Three Spring Bean Lifecycle Techniques

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When using the term ‘lifecycle’ the Guys at Spring are referring to the construction and destruction of your beans and usually this is in relation to the construction and destruction the Spring Context. There are those occassions when the management of your bean’s lifecycle is not a trivial task as there’s the need for it to perform its own internal ...

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How aggressive is method inlining in JVM?

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Ctrl + Alt + M is used in IntelliJ IDEA to extract method. Ctrl + Alt + M. It’s as simple as selecting a piece of code and hitting this combination. Eclipse also has it. I hate long methods. To the point where this smells way too long for me:                 public void ...

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Jenkins hierarchical jobs and jobs status aggregation

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As you probably know, Jenkins is highly configurable CI server. We can setup different custom build process. And I’m going to share some approach I’ve been using to setup the hierarchy of Jenkins’ jobs. Here is use case: We have one main entry job which is invoked to start the whole build process. This job can have from one to ...

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Caching with Spring Data Redis

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In the example below, I’ll show you how to use the Spring Data – Redis project as a caching provider for the Spring Cache Abstraction that was introduced in Spring 3.1. I get a lot of questions about how to use Spring’s Java based configuration so I’ll provide both XML and Java based configurations for your review. Dependencies The following ...

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A brief chronology of SSL/TLS attacks

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I haven’t had a substantial post for quite a long time, so it’s time for something useful and interesting. Although not Java-specific, this post might still be interesting to some of  you. A brief warning before reading: This is a very lengthy post, but – believe it or not – this is just the brief summary of an even longer ...

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Multiple Java JDK(s), on your MacOSX environment

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Yet again, a small tip towards configuring your Java development environment on a Mac (OSX 10.8.x+). If you are really starting right now,  I recommend you read  one of my previous posts,  a quick and clean (I suppose) way to set up your environment variables and start your Java coding. My tip for today is about easily switching from one ...

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Tips To Overcome Ageism In Hiring As a Software Professional

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As a recruiter who is about to celebrate (as if recruiters celebrate such a thing) mark fifteen years in the technology industry, I am starting to see that many of the contacts I made back in the late 90?s are now having some concerns about ageism during a job search. Any failed interview for older software professionals may cause a ...

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MongoDB Authentication

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I recently updated mongometer to make it a bit more flexible. Shortly after releasing the new version, one of the users fed back an issue via a comment on the post. I booted up my machine, opened up my IDE, found the issue and had pushed the fix out to github within half-an-hour. This isn’t a quick turn-around, success story ...

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