A common application is to generate proxy classes at runtime, i.e. to create a subclass at runtime that intercepts all method invocations. Examples: Hibernate uses Proxies to intercept method invocations on entities to implement lazy loading, i.e. fetching the object from the database when it is first accessed. The Spring Framework uses Proxies to implement … Read more
If you look at this table, you’ll see that “constant type: 18” refers to the CONSTANT_InvokeDynamic attribute whose tag value is 18 (0x12). So you are using a library which has a class parser which is not Java 8 compatible. Actually, this class parser even isn’t Java 7 compatible as this constant value is specified since Java 7. … 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
It’s not simple. Once a class is loaded by a classloader, there is no way to change the methods of loaded classes. When a class is requested, a classloader will load it and link it. And there is no way (with Java) to change the linked code or to add/remove methods. The only trick that … Read more