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Garbage Collectors – Serial vs. Parallel vs. CMS vs. G1 (and what’s new in Java 8)

The 4 Java Garbage Collectors – How the Wrong Choice Dramatically Impacts Performance The year is 2014 and there are two things that still remain a mystery to most developers – ...
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Creating an object stream from a JDBC ResultSet

The introduction of  features Stream API and Lambda in Java 8 enables us to make an elegant conversion from a JDBC ResultSet to a stream of objects just providing a mapping function. ...
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Simple Aspect Oriented Programming (AOP) using CDI in JavaEE

We write service APIs which cater to certain business logic. There are few cross-cutting concerns that cover all service APIs like Security, Logging, Auditing, Measuring Latencies and ...
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JPA Hibernate Alternatives. What can I use if JPA or Hibernate is not good enough for my project?

Hello, how are you? Today we will talk about situations that the use of the JPA/Hibernate is not recommended. Which alternatives do we have outside the JPA world? What we will talk ...
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How to customize Hibernate dirty checking mechanism

Introduction In my previous article I described the Hibernate automatic dirty checking mechanism. While you should always prefer it, there might be times when you want to add your own ...
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Objects Should Be Immutable

In object-oriented programming, an object is immutable if its state can’t be modified after it is created. In Java, a good example of an immutable object is String. Once created, ...
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JUnit in a Nutshell: Test Runners

The fourth chapter of my multi-part tutorial about JUnit testing essentials explains the purpose of the tool’s exchangable test runners architecture and introduces some of the available ...
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Java Concurrency Tutorial – Locking: Intrinsic locks

In previous posts we reviewed some of the main risks of sharing data between different threads (like atomicity and visibility) and how to design classes in order to be shared safely ...
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jUnit: Rules

Rules add special handling around tests, test cases or test suites. They can do additional validations common for all tests in the class, concurrently run multiple test instances, set ...
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EJB 3.x : Lifecycle and Concurrency models (part 2)

This is the second post of the two part series. The first part covered the life cycle and the concurrency behavior of Stateful and Stateless EJBs. I’ll cover Singleton EJBs in ...
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