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New Custom Control: TaskProgressView

I have written a new custom control and commited it to the ControlsFX project. It is a highly specialized control for showing a list of background tasks, their current status and progress. ...
java-interview-questions-answers

JPA Tutorial: Mapping Entities – Part 3

In my last article I showed two different ways to read/write persistent entity state – field and property. When field access mode is used, JPA directly reads the state values from ...
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Java And The Sweet Science

When you have been developing in Java for 15 years and a coworker asks you to help them debug a null pointer exception, you don’t expect to be surprised. Usually it is quite obvious ...
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A Java conversion puzzler, not suitable for work (or interviews)

A really hard interview question would be something like this:                   int i = Integer.MAX_VALUE; i += 0.0f; int j = i; System.out.println(j ...
java-interview-questions-answers

Injecting domain objects instead of infrastructure components

Dependency Injection is a widely used software design pattern in Java (and many other programming languages) that is used to achieve Inversion of Control. It promotes reusability, testability, ...
spring-interview-questions-answers

Spring @Configuration and injecting bean dependencies as method parameters

One of the ways Spring recommends injecting inter-dependencies between beans is shown in the following sample copied from the Spring’s reference guide here:                   @Configuration public ...
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Factory Without IF-ELSE

Object Oriented Language has very powerful feature of Polymorphism, it is used to remove if/else or switch case in code. Code without condition is easy to read. There are some places ...
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WildFly subsystem for RHQ Metrics

For RHQ-Metrics I have started writing a subsystem for WildFly 8 that is able to collect metrics inside WildFly and then send them at regular intervals (currently every minute) to a ...
java-interview-questions-answers

Beginner’s Guide to Hazelcast Part 2

This article continues the series that I have started featuring Hazelcast, a distributed, in-memory database.  If one has not read the first post, please click here. Distributed Collections Hazelcast ...
spring-interview-questions-answers

Using Asciidoctor with Spring: Rendering Asciidoc Documents with Spring MVC

Asciidoc is a text based document format, and that is why it is very useful if we want to commit our documents into a version control system and track the changes between different ...
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