Couldn't generate CGLIB subclass of class : org.springframework.aop.framework.AopConf

[ishaan]

Dear All,

I am having a problem with simple AOP application. Actually I think the proxy of my class does not created. So anybody please guide what is the actually problem and how can I resolve this. I am using Eclipse6 IDE and I added the following jars.

spring-beans.jar
spring-context.jar
spring-core.jar
commons-attributes-api.jar
commons-attributes-comiler.jar
commons-logging.jar
log4j-1.2.14.jar

spring-aop.jar
spring-agent.jar
spring-tomcat-weaver.jar
asm-2.2.3.jar
asm-comons-2.2.3.jar
asm-util-2.2.3.jar
aspectjrt.jar
aspectjweaver.jar
aopalliance.jar
cglib-nodep-2.1_3.jar
jakarta-2.0.8.jar


I found the following Exceptions

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testDao' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Couldn't generate CGLIB subclass of class [class test.TestDao]: Common causes of this problem include using a final class or a non-visible class; nested exception is net.sf.cglib.core.CodeGenerationException: java.lang.reflect.InvocationTargetException-->null
Caused by: org.springframework.aop.framework.AopConfigException: Couldn't generate CGLIB subclass of class [class test.TestDao]: Common causes of this problem include using a final class or a non-visible class; nested exception is net.sf.cglib.core.CodeGenerationException: java.lang.reflect.InvocationTargetException-->null
Caused by: net.sf.cglib.core.CodeGenerationException: java.lang.reflect.InvocationTargetException-->null
	at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:237)
	at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
	at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:285)
	at org.springframework.aop.framework.Cglib2AopProxy.getProxy(Cglib2AopProxy.java:196)
	at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:429)
	at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:299)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:315)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1181)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:428)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:270)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:733)
	at main.SpringMain.main(SpringMain.java:17)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:384)
	at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:219)
	... 13 more
Caused by: java.lang.SecurityException: class "test.TestDao$$EnhancerByCGLIB$$651400c9"'s signer information does not match signer information of other classes in the same package
	at java.lang.ClassLoader.checkCerts(Unknown Source)
	at java.lang.ClassLoader.preDefineClass(Unknown Source)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	... 19 more

my applicationCotext.xml is as follows

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">

	<bean id="testDao" class="test.TestDao" scope="prototype"></bean>
	
	<bean id="methodTimingAdvice" class="interceptor.MethodTimingInterceptor"/>
	
	<aop:config>
		<aop:pointcut id="getCountriesPointCut" expression="execution(* test.TestDao.getCountries())"/>
		<aop:advisor id="methodTimingAdvisor" advice-ref="methodTimingAdvice" pointcut-ref="getCountriesPointCut"/>
	</aop:config>
</beans>

my testDao class is as follows...

public TestDao(){
		System.out.println("Instance of TestDao is being created");
	}
	
	@Override
	public String toString() {
		return "New Object of TestDao created at ---> "+super.toString();
	}
	
	public List<String> getCountries(){
                        //having some db logic
             }
}

my TimingInteceptor is as follows

package interceptor;

import java.math.BigDecimal;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
import org.apache.commons.lang.time.DateUtils;
import org.apache.commons.lang.time.StopWatch;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class MethodTimingInterceptor implements MethodInterceptor {

	final Log log = LogFactory.getLog(getClass());
	
	public Object invoke(final MethodInvocation methodinoInvocation) throws Throwable {
		
		Object methodResult = null;
		final StopWatch stopWatch = new StopWatch();
		stopWatch.start();
		
		try{
			methodResult = methodinoInvocation.proceed();
		}finally{
			stopWatch.stop();
		}
		
		final long milis = stopWatch.getTime();
		
		final BigDecimal seconds = new BigDecimal(milis).divide(new BigDecimal(DateUtils.MILLIS_PER_SECOND), BigDecimal.ROUND_HALF_UP);
		
		log.info("Method Invocation : "+methodinoInvocation.getThis().getClass().getName()+" : "
				+methodinoInvocation.getMethod().getName()+" /n Total Time of Execution : "+seconds+" Seconds "+milis+" Milis");

		return methodResult;
	}

}

Thank you very much in advance for you response.

[Marten Deinum]

Caused by: java.lang.SecurityException: class "test.TestDao$$EnhancerByCGLIB$$651400c9"'s signer information does not match signer information of other classes in the same package

Are you working with signed jars?

[ishaan]

Dear Marten,

Thanks a lot for prompt reply. I am using the jars which Eclipse provides by default and I think those are signed as having the following files.

gunitc.sf and
gunitc.dsa

So now will you please tell me that what should I do to make my program run ?

should I need to add new jars or some other steps I need to take ?

Thanking you,

[Marten Deinum]

I am using the jars which Eclipse provides by default

Which jars?

[ishaan]

The list of jars are as follows. Which are available with Eclipse6 by default and these jar files also having the
gunitc.sf and
gunitc.dsa



spring-beans.jar
spring-context.jar
spring-core.jar
commons-attributes-api.jar
commons-attributes-comiler.jar
commons-logging.jar
log4j-1.2.14.jar

spring-aop.jar
spring-agent.jar
spring-tomcat-weaver.jar
asm-2.2.3.jar
asm-comons-2.2.3.jar
asm-util-2.2.3.jar
aspectjrt.jar
aspectjweaver.jar
aopalliance.jar
cglib-nodep-2.1_3.jar
jakarta-2.0.8.jar

[Marten Deinum]

Don't use the ones from eclipse, use the ones provided by spring.