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Java implementation of Optimal String Alignment

For a while, I’ve used the Apache Commons lang StringUtils implementation of Levenshtein distance.  It implements a few well known tricks to use less memory by only hanging on ...
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Getting Started with Hazelcast

In July I wrote a blog introducing erlang to Java developers, highlighting some of the similarities and differences between the two languages. The erlang virtual machine has a number ...
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Coordination and service discovery with Apache Zookeeper

Service-oriented design has proven to be a successful solution for a huge variety of different distributed systems. When used properly, it has a lot of benefits. But as number of services ...
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SSH & Vagrant

Vagrant is a handy tool for creating VMs. It’s a lot like firing up an EC2 instance, but in Vagrant’s case, everything is localized. And best of all, it’s free. I tend to favor ...
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What are Reentrant Locks?

In Java 5.0 a new addition was made to enhance the intrinsic locking capabilities, called as Reentrant Lock. Prior to this, ‘synchronized’ and ‘volatile’ were the means for ...
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Using Sorted Sets with Jedis API

In the previous post we started looking into Jedis API a Java Redis Client. In this post we will look into the Sorted Set(zsets). Sorted Set works like a Set in the way it doesn’t ...
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How to use ECC with OpenJDK

Everyone who ever tried to use Elliptic Curve Cryptography (ECC) in Java with an OpenJDK was either forced to use Bouncy Castle or fumble with the SunEC provider. The SunEC provider ...
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It’s not a bug, it’s…

When does a bug become a bug? Who decides that it is a bug? How many legs does a lamb have if I say the tail is a leg?  The answer is 4, just because I say the tail is a leg does ...
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Hibernate Facts: Favoring bidirectional Set(s) vs List(s)

Hibernate is a great ORM tool, and it eases development considerably, but it has a lot of gotchas you must be aware of if you want to use it properly. On medium to large projects it’s ...
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Why Do We Estimate, Anyway?

I’ve been thinking about estimation these days. After the healthcare.gov site fiasco, and all the schedule games–many of which are estimation problems, I thought about why we estimate. The ...
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