Spring provides a utility for this. http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/util/ClassUtils.html#getUserClass-java.lang.Class- public static Class<?> getUserClass(Class<?> clazz) “Return the user-defined class for the given class: usually simply the given class, but the original class in case of a CGLIB-generated subclass.”
Ref Spring docs. What is CGLIB & how is it related to Spring? CGLIB is a code generation library. Spring uses CGLIB, to generate proxies. Spring AOP defaults to using standard JDK dynamic proxies for AOP proxies. This enables any interface (or set of interfaces) to be proxied. Yes, you have to tell spring to … Read more
Short Answer Don’t iterate through all the loaded classes from Instrumentation. Instead, just examine the class name passed in to the transformer and if it matches your target class, then transform it. Otherwise, simply return the passed classfileBuffer unmodified. Make the set up calls outside the transformer, (i.e. in your case, do the following from … Read more
Analysis of bytecode libraries As I can tell from the answers you got here and ones in the questions that you have looked at, these answers do not formally address the question in the explicit manner you have stated. You asked for a comparison, meanwhile these answers have vaguely stated what one might want based … Read more
ASM java-asm CGLIB and almost all other libraries are built on top of ASM which itself acts on a very low level. This is a show-stopper for most people as you have to understand the byte code and a little bit of the JVMS to use it properly. But mastering ASM is most certainly very … Read more
Yes, Spring does some magic. Check the Spring Docs: This is where the magic comes in: All @Configuration classes are subclassed at startup-time with CGLIB. In the subclass, the child method checks the container first for any cached (scoped) beans before it calls the parent method and creates a new instance. This means that the … Read more
JDK Dynamic proxy can only proxy by interface (so your target class needs to implement an interface, which is then also implemented by the proxy class). CGLIB (and javassist) can create a proxy by subclassing. In this scenario the proxy becomes a subclass of the target class. No need for interfaces. So Java Dynamic proxies … Read more