The power of component scanning in Spring
Posted on November 5, 2021
When you use Spring (Boot) you inevitably come around or will use the @ComponentScan annotation to automatically detect your classes (meta) annotated with @Component.
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Dependency Injection in Java
Posted on July 28, 2020
Before diving in let’s take a look at two definitions of dependency injection (according to Wikipedia).
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Why are my autowired fields null
Posted on July 3, 2020
A commonly asked question on sites like StackOverflow is “Why is the field i’m autowiring null”. When this happens it generally is an error of the user as an autowired field in Spring cannot be null. At startup Spring will try to satisfy all the dependencies of a bean, if...
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Delay startup of your Spring Boot application until your DB is up.
Posted on June 30, 2020
When using Spring Boot or just plain Spring Framework it might be that you want to delay the startup of your application until a proper connection to the database can be made. This might be even more the case when using container technologies, like Docker.
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Upgrade Spring Framework in an existing application
Posted on June 21, 2019
When working on an existing application using an older version of the Spring Framework (aka Spring) it might be time to upgrade. Although in most cases upgrading to a newer version of Spring is a matter of changing the version. When doing a large upgrade, like from 2.5 to 5.1,...
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Data Objects aren't entities
Posted on February 13, 2019
When using a framework like Lombok it is very tempting and easy to use its @Data annotation.
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Use JDBI with Spring Boot
Posted on August 13, 2018
As a developer I’m always interested in using different data access technologies instead of plain JDBC. Especially combined with Spring Boot. Recently I came across JDBI and was intested in trying it out with Spring Boot as an experiment.
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Use @PropertySource with YAML files
Posted on July 4, 2018
By default the @PropertySource annotation isn’t usable with YAML files. This is also the standard answer given when asked on, for instance StackOverflow (even by me!).
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On Spring ApplicationContext and Bean Creation
Posted on April 12, 2018
There appears to be a lot of confusion in the community on how to expression bean configuration or rather how to convert bean configuration from XML to Java (or Groovy, or Kotlin, or…) as it appears as if the different ways of configuration are completely different things.
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Spring Framework: "Hidden" Gems
Posted on July 1, 2015
The Spring Framework (and its portfolio projects) contain a lot of functionality already by themselves. However there are also some nice hidden gems inside the framework, in this blog I will (un)cover a couple of them. The code for the sample(s) can be found on Github.
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Yeoman behind a (corporate) proxy
Posted on July 1, 2013
After playing around with AngularJS and Yeoman at home I decided to try it out at work. To clarify @Home I use a Mac with OSX and use Homebrew to install additional packages. @Work I have a virtual workstation running Windows 7 installed. Trying out that setup on that configuration was,...
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Hibernate Search by Example
Posted on June 27, 2013
In short Hibernate Search by Example is a great how-to guide if you quickly want to get started with Hibernate Search.
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Pro Spring MVC: with Web Flow - Sample Application Fails To Start
Posted on July 30, 2012
Update (1-8-2012): Please download the most recent version of the sources from either the GitHub repository or from the Apress website. This version fixes the problem with the project dependencies.
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Spring Security 3
Posted on November 7, 2010
Spring Security 3 is a pretty decent book if you want to get started with Spring Security or want to know more of the internals or exotic features it has to offer.
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Spring Persistence with Hibernate
Posted on November 5, 2010
This book sets out to explain the usage of hibernate with the spring framework. This is basically done in the first chapters. It explains how to configure hibernate from within a spring ApplicationContext and it explains how to write a dao. To bad that, for the dao, they still use...
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Migrate classic J2EE to Spring (Step 1) (revised)
Posted on October 2, 2009
A couple of months ago I wrote a step 1 on migrating a classis J(2)EE application to a spring based application. Recently I had some time again on my hands and after studying the application and also after some discussions I had I decided to structure the project a little...
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Spring Web Flow 2 Web Development
Posted on May 25, 2009
A few weeks ago I was contacted by packt publishing to review one of their books. They asked me if I wanted to review Spring Web Flow 2 Web Development (sample chapter).
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Migrate classic J2EE to Spring (Step 1)
Posted on May 6, 2009
A few months ago SpringSource released a white paper describing the migration from J2EE to a Spring framework based application. Even before they wrote that white paper I already had the idea of writing something about how to migrate from J2EE to a Spring based application. However Colin Sampaleanu (at...
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Configuring JNDI Resources in Tomcat
Posted on January 14, 2008
It seems quite hard to configure a JNDI Resource in Tomcat. Especially when it comes to configuring XA capable resources. The key lies in understanding how Resources work/need to be configured. A Resource has a few properties which are used by Tomcat, those are the auth, name, description, scope and...
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Securing Spring Web Flow
Posted on June 13, 2007
Well that is the title of the presentation I just gave at the NL-JUG 2007 conference. The presentation was about the Spring Web Flow solution we created to secure flows. The presentation can be found and the conference website. The code is available in the JIRA under issue SWF-93 but...
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Converting String to Date and Date-formatting in Spring-MVC
Posted on February 9, 2007
This week alone I answered the question about date formatting and how to bind Strings to Objects multiple times. If I would get an euro/dollar for everytime I gave the same answer. So I figured maybe it is time to create simple example to show how it is done in...
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One application, per client database
Posted on January 5, 2007
In one of my recent projects we came a cross an application model which had 1 codebase but for every client they had (around 40) they deployed one application. Sometimes they had to redeploy several times because they had memory and performance issues. We soon realized that we needed to...
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Spring Web Flow Tag Library
Posted on December 21, 2006
A while ago we started to use Spring Web Flow. We needed to convert our old WizardForms and Multi SimpleFormController screens to the Spring Web Flow ones. After converting about three jsp’s I got fed up with the hidden fields, the submit buttons with the specified name. Generating urls with...
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Using multiple validators in Controllers and FormAction
Posted on December 13, 2006
On a job I did recently we did a lot of refactoring the old (web) application, they used an abundance of (Web) Frameworks, we reduced it to 1 (well actually 2 if you count Spring Web Flow :) ).
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