Проблема с Spring AOP и финальным выбрасыванием класса "Не удалось сгенерировать подкласс CGLIB" - PullRequest
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Проблема с Spring AOP и финальным выбрасыванием класса "Не удалось сгенерировать подкласс CGLIB"

0 голосов
/ 15 октября 2018

1) Ниже представлен небольшой проект, в котором я хочу войти в SpringAOP.Использование spring-aop-4.1.6.RELEASE.jar и ниже - это LoggingAspect.java с несколькими точечными разрезами.

package com.myprj.aop.aspect;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class LoggingAspect {
    private final Log log = LogFactory.getLog(getClass());

    @Before("logForAllMethods()") // after advice with name pointcut that declared as name logForAllMethods()
    public void beforeAdviceForAllMethods(JoinPoint jp) throws Throwable {
        Object clazz = jp.getTarget().getClass().getName();
        String methodName = jp.getSignature().getName();
        log.info("Before Entering to Class " + clazz + " With Method Name " + methodName);
        // getting method parameter name
        Object[] obj = jp.getArgs();
        for (Object o : obj) {
            if (o != null) {
                log.info("Parameter Name..." + o.toString());
            } else {
                log.info("");
            }
        }

    }

    @After("logForAllMethods()") // after advice with name pointcut that declared as name logForAllMethods()
    public void afterAdviceForAllMethods(JoinPoint jp) throws Throwable {
        Object clazz = jp.getTarget().getClass().getName();
        String methodName = jp.getSignature().getName();
        log.info("After Entring to Method " + methodName + " in Calss " + clazz);
    }

    @Pointcut("execution(public * *(..))")      // enable for all public methods
    public void logForAllMethods() {
    }
}

Также ниже приведены примеры классов Service и ServiceImpl, которые у меня есть 

package com.myprj.aop.service;

public interface TransferService {

    void transfer(String accountA, String accountB, Long amount);

    Double checkBalance(String account);

    Long withdrawal(String account, Long amount);

    void diposite(String account, Long amount);
}


package com.myprj.aop.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

@Service
public class TransferServiceImpl implements TransferService {

    @Autowired
    @Qualifier("finalClass")
    FinalClass finalClass;

    @Override
    public void transfer(String accountA, String accountB, Long amount) {
        System.out.println(amount + " Amount has been tranfered from " + accountA + " to " + accountB);
    }

    @Override
    public Double checkBalance(String account) {
        System.out.println("Available balance: 50000");
        finalClass.toString();
        return new Double(50000);
    }

    @Override
    public Long withdrawal(String account, Long amount) {
        System.out.println("Withdrawal amount: " + amount);
        finalClass.toString();
        return amount;
    }

    @Override
    public void diposite(String account, Long amount) {
        System.out.println(amount + " Amount has been diposited to " + account);
        finalClass.toString();
    }

}

Кроме того, у меня есть класс Singleton, в котором нужно вызывать несколько методов, как показано ниже. 

package com.myprj.aop.service;

public class FinalClass {

    private String constructorParam;

    private FinalClass(String param) {
        constructorParam = param;
    }

    @Override
    public String toString() {
        System.out.println(constructorParam);
        return constructorParam;
    }
}

Ниже приведен applicationContext.xml 

<?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:util="http://www.springframework.org/schema/util"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <context:component-scan base-package="com.myprj.aop.*" />       
    <bean id="finalClass" class="com.myprj.aop.service.FinalClass">
        <constructor-arg value="constructorArg"></constructor-arg>
    </bean>
    <aop:aspectj-autoproxy/>    
</beans>

Основной класс: 

package com.myprj.aop.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.myprj.aop.config.AppConfig;
import com.myprj.aop.service.TransferService;


public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // ConfigurableApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
        TransferService transferService = applicationContext.getBean(TransferService.class);
        transferService.transfer("accountA", "accountB", 50000l);
        transferService.checkBalance("accountA");
        transferService.diposite("accountA", 50000l);
        transferService.withdrawal("accountB", 40000l);
        //applicationContext.close();
    }

}

Ошибка ниже 

WARNING: Exception encountered during context initialization - cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transferServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.myprj.aop.service.FinalClass com.myprj.aop.service.TransferServiceImpl.finalClass; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'finalClass' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.myprj.aop.test.Main.main(Main.java:19)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.myprj.aop.service.FinalClass com.myprj.aop.service.TransferServiceImpl.finalClass; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'finalClass' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 13 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'finalClass' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1120)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1044)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 15 more
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:212)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:109)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:447)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:333)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:293)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
    ... 24 more
Caused by: java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:531)
    at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:448)
    at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
    at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:202)
    ... 31 more

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transferServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.myprj.aop.service.FinalClass com.myprj.aop.service.TransferServiceImpl.finalClass; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'finalClass' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1210)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.myprj.aop.test.Main.main(Main.java:19)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.myprj.aop.service.FinalClass com.myprj.aop.service.TransferServiceImpl.finalClass; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'finalClass' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 13 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'finalClass' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1120)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1044)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 15 more
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class com.myprj.aop.service.FinalClass]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:212)
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:109)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:447)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:333)
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:293)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:422)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
    ... 24 more
Caused by: java.lang.IllegalArgumentException: No visible constructors in class com.myprj.aop.service.FinalClass
    at org.springframework.cglib.proxy.Enhancer.filterConstructors(Enhancer.java:531)
    at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:448)
    at org.springframework.cglib.transform.TransformingClassGenerator.generateClass(TransformingClassGenerator.java:33)
    at org.springframework.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
    at org.springframework.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216)
    at org.springframework.cglib.proxy.Enhancer.createHelper(Enhancer.java:377)
    at org.springframework.cglib.proxy.Enhancer.createClass(Enhancer.java:317)
    at org.springframework.aop.framework.ObjenesisCglibAopProxy.createProxyClassAndInstance(ObjenesisCglibAopProxy.java:57)
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:202)
    ... 31 more

Инъекция инъекций не удалась.После поиска в Google многие предложили инъекцию на основе сеттера.Но когда создается синглтон-класс, в реальном коде выполняется больше операций.Также по ссылке ниже, это было исправлено в Spring 4.0 .Что не так с моим кодом?

Ответы [ 2 ]

0 голосов
/ 15 октября 2018

Он говорит вам, в чем проблема: No visible constructors in class com.myprj.aop.service.FinalClass.

Spring не может "угадать", какой статический метод getInstance () вызывать для создания экземпляра синглтона.
Вы должны предоставить для этого открытый пустой c'or.

Если вы используете Spring в своем приложении, вы можете определить FinalClass как синглтон, используя свойство @ Scope .

0 голосов
/ 15 октября 2018

как говорит само ваше исключение 

No visible constructors in class com.myprj.aop.service.FinalClass

измените ваш частный конструктор на public.

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