In this post, we will see how to resolve Is there some method to get all class name under some package of JRE’s system module(Java9+),for example java.base Question: I refer to this article (https://www.baeldung.com/java-find-all-classes-in-package), under Java11: work only to the ...

Question: I am trying to compile, load and use an inherited class at runtime. Here is the structure of my Java/Maven project. Note there are no .java files under com.mycompany.model.inherited. This is where generated class files will be placed. BaseClass.java ...

Question: This is the definition of java.lang.ClassLoader.resolveClass(Class) in OpenJDK 20+10: It appears to be doing nothing except checking that the argument is non-null. And yet, the doc comment claims: Does calling this method actually do anything useful? Since it is ...

Question: I have a maven project for an application, which I run in a WildFly server. The project has log4j dependencies: I would like to get the LoggerContext like this: However, this results in ClassCastException: After some debugging, I have ...

Question: I am trying to enable AspectJ load-time weaving (not Spring AOP) in a Spring Boot application. My goal is to weave advice into annotated fields and java.lang.reflect.Field.set(Object, Object) at load-time. Per the Spring docs, I tried: Running the Spring ...

Question: I am trying to compile and load dynamically generated Java code during runtime. Since both ClassLoader::defineClass and Unsafe::defineAnonymousClass have serious drawbacks in this scenario, I tried using hidden classes via Lookup::defineHiddenClass instead. This works fine for all classes that ...