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Cglib

CGLib (Code Generation Library) is a run time code generation library for the Java platform licensed under the Apache 2.0 license.

Javassist

Javassist is a class library for editing bytecode in java.



Others

Example

Note that javassist is significantly slower then for example cglib because it reads in class files directly instead of using reflective access in order to avoid class loading

from question  

Attach proxy to an existing object?

The javadoc of javassist is way better than that of cglib

from question  

Are there alternatives to cglib?

The class engineering api is ok but javassist is not perfect either;in particular the proxyfactory which is the equivalent of the cglib s enhancer suffer from some drawbacks too just to list a few

from question  

Are there alternatives to cglib?

You can instead register an asm visitor with the cglib enhancer which should be responsible for adding the annotation to the cglib generated class;however you might want to consider creating your classes using javassist which has a more modern api and supports the writing of annotations

from question  

RESTEasy can't find Message Body Writer for application/xml when using dynamically created class

This makes for example javassist or proxetta significantly slower than cglib which simply reads the methods via the reflection api and overrides them

from question  

Are there alternatives to cglib?

Also javassist is recognized to be slower than cglib

from question  

Are there alternatives to cglib?

Here in so i found a lot of questions asking something similar and the answers normally said you can use cglib or asm or javassist is better than cglib or bcel is old and is dying or asm is the best because it gives x and y

from question  

Dynamic Java Bytecode Manipulation Framework Comparison

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