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For one of the projects to provide a piece of generic functionality I had to write a small library based on annotations and reflection. The reflective invocatons include new instance creation via java.lang.Constructor.newInstance(…) and field value retrieval via java.lang.Field.get(Object). Since this library had also to be efficient in terms of … Continue reading
This is a note about Maven assembly plugin (version 2.3) in case someone wants to build similar distribution as I did using maven. Basically, if you try to create a custom distribution of a multimodule project and one of your modules is a web module (project of type ‘war’) with … Continue reading
First of all, I have to mention that Java 7 is supported only on MacOS X 10.7 (Lion) and later. 1. Download JDK 7 for MacOS from Oracle’s download site: http://www.oracle.com/technetwork/java/javase/downloads/jdk7u7-downloads-1836413.html 2. Double click the downloaded jdk-7u7-macosx-x64.dmg file. In result it will be mounted as a new device named JDK … Continue reading
We all used to define properties in Java classes with three (or two in case of a read-only property) components: – a private field, – a getter method and – a setter method. For instance: private String name; public void setName(String name) { this.name = name; } public String … Continue reading
Say, you’ve got a nicely designed piece of functionality that is to load some data and process it using some not trivial algorithm, which may include loading other bits of data. To make your algorithm isolated and stateless you decide to define all needed data as input parameters. And maybe … Continue reading
I was looking for an existing mechanisms in Spring to automatically reload bean definitions and stumbled on this old but still very useful article: Groovier Spring, Part 2: Change application behavior at run time Some of the described techniques discussed in the article are: 1. How to make Spring automatically … Continue reading
The bigger the application the more difficult to identify reasons for performance degradation and memory leaks (certainly, if there is a need at all). I turn to the low level analysis of runtime data (thread and heap dumps) only as a last resort to narrow down the scope for the … Continue reading
A couple days ago I posted an algorithmic problem. Stas Bashkirtsev provided quite a nice and clean solution, he chose Java and object-oriented approach (before re-posting it here I let myself to clean the code a little bit to reduce the size of it: removed irrelevant lines of code and … Continue reading
An interesting problem that seems very simple at a first glance. Given an array of strings { “PRAGMATIC”, “CREATIVITY”, “SOFTWARE”, “BLOG” } An algorithm should produce the following output: “PCSB”, “PCSL”, “PCSO”, “PCSG”, “PCOB”, “PCOL”, … (I guess you got the pattern ) Feel free to post your code for … Continue reading