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CORS with Keycloak and Spring Boot

A quick tip regarding Keycloak, Spring Boot and some kind of JavaScript UI technology. When you’re trying to connect a JavaScript UI like Angular to a backend which is secured by Keycloak you have to be aware of CORS. I’m pretty sure you already know this. However, there is a common pitfall, you have to […]

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How to check for updated dependencies with maven

Regularly updating your dependencies in a project is important because it ensures that you will get all the nice bugfixes that were done in the meantime in some of the libraries you use. However this can be a time-consuming and annoying task. Good news if you’re using maven because there is a nice command which […]

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Continuous Delivery with Jenkins and Docker

If you’ve ever wondered how to actually build a continuous delivery pipeline for your project this is going to be the ultimative guide. I will tell you how you can build a continuous delivery pipeline from ground up. The pipeline will make heavy use of Jenkins together with Docker to provide a stable platform to […]

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Speed up development with vagrant

Maybe you know this situation: Coming to a new project often requires to install a lot of stuff. Databases, Web servers, Dependencies and all the other stuff is starting to clutter your workstation. If you switch often between projects or you just want to try out a new technology for some days this could be […]

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Injecting properties in Java EE applications

In almost any application there are some settings that must be read from somewhere to configure the application. User names or IP addresses are great examples for such settings. To use settings is the standard procedure to make software configurable. There are many possibilities that one can use to achieve this. One example would be […]

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IIS Error 500 ExtensionlessUrlHandler

I’ve recently encountered the following error in my IIS after starting a (previously) working ASP .NET application: Handler “ExtensionlessUrlHandler-Integrated-4.0” has a bad module “ManagedPipelineHandler” in its module list (or in German: Der Handler “ExtensionlessUrlHandler-Integrated-4.0” weist das ung├╝ltige Modul “ManagedPipelineHandler” in der Modulliste auf) The error appeared after a fresh reinstall of Windows. After a lot […]

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C# How to force decimal precision in xml serialization

Recently, I’ve tried to serialize some xml in c# and stumbled accross the problem that I had to force the precision scale of decimal values. By default the XmlSerializer uses the exact value of the underlying decimal value while serializing to xml. That means, if you assign 2 to a decimal value your xml will […]

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Parse XML files with Groovy

Have you ever wondered how to parse a XML document with Groovy? Assume that we have the following xml stored in the file notes.xml: <notes>     <note>         <to>John</to>         <from>Kyle</from>         <heading>Reminder</heading>         <body>Don’t forget me this weekend!</body>     </note> […]

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Analyze and Visualize your Azure Logfiles with Alfa

I’ve been using Microsoft’s Cloud Platform Azure for several years now. Azure has built in logging support which can be used by applications deployed to Azure. Logging is as simple as calling one of the methods from the System.Diagnostics.Trace class. Trace.TraceInformation();   Trace.TraceWarning();   Trace.TraceError() All these logging information will NOT be stored in a […]

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JavaZone: Game of Codes

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