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Determining File Types in Java

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Programmatically determining the type of a file can be surprisingly tricky and there have been many content-based file identification approaches proposed and implemented. There are several implementations available in Java for detecting file types and most of them are largely or solely based on files’ extensions. This post looks at some of the most commonly available implementations of file type ...

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Even Doctors Will Be Data Scientists

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We all know how it works. You walk into a doctor’s office complaining about some pain in your leg or otherwise. They take your temperature, get you on the scale, check your blood pressure, and perhaps even get out the rubber hammer. These measurements are simply snapshots at one particular instant in time and may be subject to error. This ...

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JBoss Fuse – Some less known trick

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TL;DR expose java static calls as Karaf shell native commands override OSGi Headers at deploy time override OSGi Headers after deploy time with OSGi Fragments Expose java static calls as Karaf shell native commands As part of my job as software engineer that has to collaborate with support guys and customers, I very often find myself in the need of ...

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The Optimum Method to Concatenate Strings in Java

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Recently I was asked this question – Is it bad for performance to use the + operator to concatenate Strings in Java? This got me thinking about the different ways in Java to concatenate Strings and how they would all perform against each other. These are the methods I’m going to investigate:           Using the + operator Using ...

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MySQL as Kubernetes Service, Access from WildFly Pod

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Java EE 7 and WildFly on Kubernetes using Vagrant (Tech Tip #71) explained how to run a trivial Java EE 7 application on WildFly hosted using Kubernetes and Docker. The Java EE 7 application was the hands-on lab that have been delivered around the world. It uses an in-memory database that is bundled with WildFly and allows to understand the ...

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“NoSQL Injection” – What 40000 Unsecured MongoDB Databases Mean for our Industry

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The news is all over reddit… Major security alert as 40,000 MongoDB databases left unsecured on the internet Security is a feature that is often neglected until it’s too late. And when it’s too late, it is often hard to bake it into a well-established architecture without major refactoring efforts. Every system and thus also every database is always vulnerable. ...

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How to: Refine Hive ZooKeeper Lock Manager Implementation

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Hive has been using ZooKeeper as distributed lock manager to support concurrency in HiveServer2. The ZooKeeper-based lock manager works fine in a small scale environment. However, as more and more users move to HiveServer2 from HiveServer and start to create a large number of concurrent sessions, problems can arise. The major problem is that the number of open connections between ...

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