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Hibernate Facts: Knowing flush operations order matters

Hibernate shifts the developer mindset from thinking SQL into thinking object state transitions. According to Hibernate Docs entity may be in one of the following states:                  new/transient: ...
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The Code That Made me Cry

A friend of mine recently told me about the kind of problems he’s currently struggling with in the legacy application he’s maintaining. Here’s a sample piece of code to illustrate ...
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MongoDB optimistic locking

When moving from JPA to MongoDb you start to realize how many JPA features you’ve previously taken for granted. JPA prevents “lost updates” through both pessimistic and optimistic ...
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Would you dare to change HashMap implementation?

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 ...
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Type Conversion in Spring

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 ...
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Top 10 Lists of Common Java Mistakes (That Makes Top 100!)

Top 10 lists are very popular, fun, and informative to read. But there are so many of them! How to choose the right one? Here’s a meta top 10 list helping you find the top 10 top ...
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Too Many Parameters in Java Methods, Part 7: Mutable State

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

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 ...
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Authentication and Authorization as an open source solution service

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 ...
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4 Signs That Agile is Declining-The Sequel

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 ...
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