reflection

Oct 28, 2018 annotations reflection vaadin

Listing annotated classes in Java EE

The Java EE platform is huge, and I must confess I’m not aware of every one of its API. This is also true of the Spring framework, even though I think I know more of Spring than of Java EE. Lately, I was working on the version 10 of the Vaadin framework also known as Vaadin Flow. This version introduces routes. When a path is requested, the Vaadin Servlet displays the component. Routes are created by annotating specific components with the @Route annotation. Thus, Vaadin needs to list all a

Jul 29, 2018 GraalVM native AOT reflection

Configuring Graal Native AOT for reflection

I’ve been following GraalVM with a lot of interest. One of the interesting areas is its ability to compile bytecode Ahead-Of-Time, and create a native image. Such images have a lot of advantages, including small size, no dependency on a JRE, etc. However, AOT has some limitations. In particular, the native image executable cannot compile what it doesn’t know about. This post aims to describe how to configure the compilation process when code is using reflection. Let’s start

Aug 15, 2008 reflection

Java - The power of reflection

Ever heard of reflection? It’s a powerful Java technique that make it a possible for the JVM to manipulate objects the developer did not know about. There’s an entire API devoted to it: it is located under the java.lang.reflect package. For example, I once created a RPC web-services engine that could launch any methods of any class so long a the adequate class could be found on the classpath. It is not really hard to do. But the true power of reflection lies within its ability to