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How to build and clear a reference data cache with singleton EJBs and MBeans

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In one of my projects I had a requirement to load reference data from several sources in a Java EE 6 WebLogic environment, with EclipseLink as ORM framework. Since I couldn’t find an annotation in the Java EE world comparable to the [email protected] from Spring YET, I had to write my “own” caching solution. Although reference data barely changes over time, ...

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How Nashorn Impacts API Evolution on a New Level

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Following our previous article about how to use jOOQ with Java 8 and Nashorn, one of our users discovered a flaw in using the jOOQ API as discussed here on the user group. In essence, the flaw can be summarised like so:               Java code package org.jooq.nashorn.test; public class API { public static void ...

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How to Access a Git Repository with JGit

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A Git repository is represented in JGit through the Repository class that can be viewed as a handle to a repository. With a Repository instance, you can create JGit commands (through the Git factory class), gain access to configuration settings, resolve refs, etc. There are several ways to obtain a repository reference and because I have seen people having trouble ...

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Using @ConfigurationProperties in Spring Boot

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In my latest blog post I described shortly how one can configure mail in Spring Boot application. To inject properties into the configuration I used Spring’s @Value annotation. But Spring Boot provides an alternative method of working with properties that allows strongly typed beans to govern and validate the configuration of your application. In this post I will demonstrate how ...

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Property-based testing with Spock

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Property based testing is an alternative approach to testing, complementing example based testing. The latter is what we’ve been doing all our lives: exercising production code against “examples” – inputs we think are representative. Picking these examples is an art on its own: “ordinary” inputs, edge cases, malformed inputs, etc. But why are we limiting ourselves to just few examples? ...

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Maven Common Problems and Pitfalls

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Love it or hate it (and a lot of people seem to hate it), Maven is a widely used tool by 64% of Java developers (source – Java Tools and Technologies Landscape for 2014). Most experienced developers already got their share of Maven headaches. Usually in the hard way, banging with their head into a brick wall. Unfortunately, I feel ...

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Processing Java Annotations Using Reflection

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In my previous article covering Java Annotations, I outlined a recent use case and provided you with some examples of custom annotations and how they might be used. In this article, I’m going to take that a step further and give you a few examples of custom annotations and how you would process these custom annotations using the Java Reflection API. ...

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AngularJS: Different ways of using Array Filters

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AngularJS provides filter feature which can be used to format input value or to filter an Array with the given matching input criteria. For example you can use ‘date’ filter to format a Date value into human readable Date representation like MM-DD-YYYY as {{dob | date}}. On the other hand there are Array filtering feature which is very useful while ...

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JUnit in a Nutshell: Unit Test Assertion

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This chapter of JUnit in a Nutshell covers various unit test assertion techniques. It elaborates on the pros and cons of the built-in mechanism, Hamcrest matchers and AssertJ assertions. The ongoing example enlarges upon the subject and shows how to create and use custom matchers/assertions. Unit Test Assertion Trust, but verify Ronald Reagan The post Test Structure explained why unit ...

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Garbage Collection: increasing the throughput

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The inspiration for this post came after stumbling upon “Pig in the Python” definition in the memory management glossary. Apparently, this term is used to explain the situation where GC repeatedly promotes large objects from generation to generation. The effect of doing so is supposedly similar to that of a python swallowing its prey in whole only to become immobilised ...

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