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Grails render images on the fly in GSP

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This tutorial will show how to generate PNG images on the fly and display inside a GSP. This can serve as a basis on how to create a more complex behavior. For example, creating report graphs for display in your applications. Sample Output This tutorial will show how to generate simple shapes based on input size and color. Squares and ...

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Microservices in the Enterprise: Friend or Foe?

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A micro approach to a macro problem? The microservice hype is everywhere, and although the industry can’t seem to agree on an exact definition, we are repeatedly told that moving away from a monolithic application to a Service-Oriented Architecture (SOA) consisting of small services is the correct way to build and evolve software systems. However, there is currently an absence ...

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Infinite Loops. Or: Anything that Can Possibly Go Wrong, Does.

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A wise man once said: Anything that can possibly go wrong, does – Murphy Some programmers are wise men, thus a wise programmer once said: A good programmer is someone who looks both ways before crossing a one-way street. – Doug Linder In a perfect world, things work as expected and you may think that it is a good idea ...

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Java Flight Recorder (JFR)

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JFR is a Java profiler which will allow you to investigate the runtime characteristics of your code. Typically you will use a profiler to determine which parts of your code are causing  large amounts of memory allocation or causing excess CPU to be consumed. There are plenty of products out there.  In the past I’ve used YourKit, OptimizeIt, JProfiler, NetBeans ...

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How to get a 10,000 points StackOverflow reputation

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How it all started In spring 2014, I initiated the Hibernate Master Class project, focusing on best practices and well-established usage patterns. I then realized that all my previous Hibernate experience wouldn’t be enough for this task. I needed more than that. Hibernate has a very steep learning curve and tens of new StackOverflow questions are being asked on a ...

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The New Agile – Size Matters

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Coming up on the 15th year of agile, do we understand business better? Remember that agile started in development teams? As the time passes, we feel that what the agile manifesto can be applied also at the product level, and maybe even at the portfolio level. There’s definitely a demand for scaling the process from the business side. Let’s take ...

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Job Security, Career Stability, and Employability For Startups

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I was recently asked to answer a question on Quora about startups and stability, and as I read some of the other replies I noticed a trend. The question was basically “Would joining a startup be a mistake for someone with the goals of stability and career progression?”. The questioner then defined stability as being able to support a family and have nice things (financial ...

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Using Google Guava Cache for local caching

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Lot of times we would have to fetch the data from a database or another webservice or load it from file system. In cases where it involves a network call there would be inherent network latencies, network bandwidth limitations. One of the approaches to overcome this is to have a cache local to the application. If your application spans across ...

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JVM is down with “OutOfMemory” error – what should I do?

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Amazing as it may seem, but this particular cry “From the Depths” is frequently displayed among the results of search requests regarding JVM settings. You have probably been faced with the “I remember that option, but how to enable it” problem, while administrating servers or adjusting virtual appliances at times (semi-annualy, for example) and apart from your main tasks. There ...

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