class net.sf.cglib.core.DebuggingClassWriter has interface org.objectweb.asm.ClassVisitor as super class

In this post we see how to resolve the exception "java.lang.IncompatibleClassChangeError: class net.sf.cglib.core.DebuggingClassWriter has interface org.objectweb.asm.ClassVisitor as super class".The full stacktrace for this exception will look like below:

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employee' defined in class path resource [aop.xml]: Initialization of bean failed; nested exception is java.lang.IncompatibleClassChangeError: class net.sf.cglib.core.DebuggingClassWriter has interface org.objectweb.asm.ClassVisitor as super class

           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)

           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)

           at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)

           at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)

           at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)

           at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)

           at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580)

           at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)

           at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)

           at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)

           at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93)

           at aspect.AspectTest.main(AspectTest.java:10)

Caused by: java.lang.IncompatibleClassChangeError: class net.sf.cglib.core.DebuggingClassWriter has interface org.objectweb.asm.ClassVisitor as super class

           at java.lang.ClassLoader.defineClass1(Native Method)

           at java.lang.ClassLoader.defineClass(Unknown Source)

           at java.security.SecureClassLoader.defineClass(Unknown Source)

           at java.net.URLClassLoader.defineClass(Unknown Source)

           at java.net.URLClassLoader.access$100(Unknown Source)

           at java.net.URLClassLoader$1.run(Unknown Source)

           at java.net.URLClassLoader$1.run(Unknown Source)

           at java.security.AccessController.doPrivileged(Native Method)

           at java.net.URLClassLoader.findClass(Unknown Source)

           at java.lang.ClassLoader.loadClass(Unknown Source)

           at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

           at java.lang.ClassLoader.loadClass(Unknown Source)

           at net.sf.cglib.core.DefaultGeneratorStrategy.getClassVisitor(DefaultGeneratorStrategy.java:30)

           at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:24)

           at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)

           at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144)

           at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:116)

           at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108)

           at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104)

           at net.sf.cglib.proxy.Enhancer.(Enhancer.java:69)

           at org.springframework.aop.framework.Cglib2AopProxy.createEnhancer(Cglib2AopProxy.java:228)

           at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:170)

           at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:112)

           at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:476)

           at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:362)

           at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:322)

           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:407)

           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1426)

           at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)

           ... 11 more

This exception will be thrown,if we have the cglib.jar referring to a incompatible asm.jar set in our classpath.For instance if we have cglib-3.1.jar we will get this exception when we have asm-3.1.jar set in the classpath.Hence to resolve this we need to remove this older version of asm.jar and refer the asm.jar version greater than 4.0.So if we add the asm-4.0.jar(which is the compatible version for the cglib-3.1) to our classpath,we will not get the above exception.