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Creating a generic array in Java

Generic array initialization Recently I work with CompletableFutures. I used the allOf method which takes a varargs as input. Based on the request, a couple of things had to be processed. So how do I create a generic array that I could use at CompletableFuture.allof()? Array.newInstance together with toArray() does the trick. This is my […]

Echo your REST calls with a echo service

Echo services are a simple tool for developing and testing When you implement a service are often in a situation where you have to call another web service, for example service B. And to complicate the situation, service B is not fully implemented or even not available. Than an echo service could make sense for […]

Counting active accounts with Metrics

Based on a request parameter in a servlet context Recently I had the task to report active accounts based on http requests. Here I’m going to show you my solution with Dropwizard Metrics. Basically I am using a servlet filter togehter with an counter. Each account has its own counter. So I have a ConcurrentHashMap […]

Why you should use new language features

A quick list I put together a list with a number of reasons why you should use new language features. The list includes points which are obvious, I learned or I found on the internet. improved design * easier to understand * easier to change * less defects effectiveness * using standards * getting help […]

Test JSON with a few lines of code

JSONassert helps you writing JSON unit tests You have to write a unit test and JSON is involved. Usually this will end up in a lot of lines of code. You know the situation, I bet. Here JSONassert comes into play. It allows to write JSON unit tests with just a few lines of code. For example checking an […]