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Would you dare to change HashMap implementation?

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There are bold engineers working for the Oracle nowadays. I came to this conclusion when trying to nail down a Heisenbug yesterday. Not too surprisingly, the bug seemed to disappear when I was trying to find the solution. Several hours later, the “Heisen”-part of the bug was removed, when the problem was traced down to minor differences between the JDK7 ...

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Type Conversion in Spring

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Here are few straight cases where we need type conversion: Case #1. To help simplifying bean configurations, Spring supports conversion of property values to and from text values. Each property editor is designed for a property of certain type only. And to put them in use, we have to register them with Spring container. Case #2. Also when using Spring ...

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Too Many Parameters in Java Methods, Part 7: Mutable State

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In this seventh post of my series on addressing the issue of too many parameters in a Java method or constructor, I look at using state to reduce the need to pass parameters. One of the reasons I have waited until the 7th post of this series to address this is that it is one of my least favorite approaches ...

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Too Many Parameters in Java Methods, Part 6: Method Returns

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In the current series of posts I am writing on reducing the number of parameters required to call Java methods and constructors, I have focused so far on approaches that directly affect the parameters themselves (custom types, parameters objects, builder pattern, method overloading, and method naming). Given this, it might seem surprising for me to devote a post in this ...

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Authentication and Authorization as an open source solution service

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Designing a centralized service for all user data by implementing authentication and authorization (a&a) mechanism. I’ll share my experience and finalize conclusions for a solution. The design includes the clients (Web applications) and the server (a&a center). Terminology:       1. Authentication: Authentication is the mechanism whereby systems may securely identify their users. Answering the question “Who is the User?” ...

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4 Signs That Agile is Declining-The Sequel

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It’s been more than two years since I’ve wrote “4 signs that agile is declining”. I gave a talk at Agile Eastern Europe (which hopefully will be up soon) that revisited this topic. I went over  things I see today that help agile lose. Not because it’s bad, but the way it seems from business point of view. Here’s a ...

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Batch processing best practices

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Most applications have at least one batch processing task, executing a particular logic in the background. Writing a batch job is not complicated but there are some basic rules you need to be aware of, and I am going to enumerate the ones I found to be most important. From an input type point of view, the processing items may ...

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Landscapes in Mobile Application Security

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There are different aspects in Cloud and Mobile application security – and in different angles you can look in to it. Within the first decade of the 21st century – internet worldwide increased from 350 million to more than 2 billion and Mobile phone subscribers from 750 million to 5 billion – and today it hits 6 billion mark – ...

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R.I.P. RETE time to get PHREAKY

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I’ve just done some high level documentation for the new rule algorithm I’ve called PHREAK, a word play on Hybrid Reasoning. It’s still a bit rough and high level, but hopefully still interesting. It builds on ReteOO, so good to read that bit first. ReteOO Algorithm The ReteOO was developed throughout the 3, 4 and 5 series releases. It takes ...

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