SpringトランザクションアノテーションがCGLIBエラーを返す

Question

@Transactionalアノテーションを使用するときに次のエラーが発生します。何か案は？

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myRepository' defined in file [myFile]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class myRepository]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191) 
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:636) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) 
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) 
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) 
    at myRepository.main(myRepository.java:104) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:606) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) 
Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class [class myRepository]: Common causes of this problem include using a final class or a non-visible class; nested exception is java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given 
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:217) 
    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:111) 
    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:477) 
    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:409) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1520) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) 
    ... 16 more 
Caused by: java.lang.IllegalArgumentException: Superclass has no null constructors but no arguments were given 
    at org.springframework.cglib.proxy.Enhancer.emitConstructors(Enhancer.java:721) 
    at org.springframework.cglib.proxy.Enhancer.generateClass(Enhancer.java:499) 
    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.create(Enhancer.java:285) 
    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:205) 

コード：

@Repository 
public class MyRepository { 

    private MyDao myDao; 


    @Autowired 
    public MyRepository(MyDao myDao) { 
     this.myDao = myDao 
    } 

    @Transactional 
    public void save(Object obj) { 
     if (obj.isNew()) 
      myDao.create(obj) 

    } 
} 

XML：

<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"> 

<!-- Enable Annotation based Declarative Transaction Management --> 
<tx:annotation-driven proxy-target-class="true" 
         transaction-manager="transactionManager" /> 

<!-- Creating TransactionManager Bean, since JDBC we are creating of type DataSourceTransactionManager --> 
<bean id="transactionManager" 
     class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> 
    <property name="dataSource" ref="dataSource" /> 
</bean> 

<bean id="dataSource" 
     class="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" > 

// datasource settings 
</bean> 

Answer 1

スーパークラスは、あなたがフィールドをautowireする必要がヌルコンストラクタを持っていませんが、引数が

を与えられませんでした、とコンストラクターを削除するか、引数なしのコンストラクターを追加してください。 CGLIBは全く関与する必要はありませんので、代わりに

@Repository 
public class MyRepository { 
    @Autowired 
    private MyDao myDao; 

    @Transactional 
    public void save(Object obj) { 
     if (obj.isNew()) 
      myDao.create(obj) 
     } 
    } 
} 

は、クラスの代わりに@Transactionalインタフェースを使用しています。

@Repository 
@Transactional 
public interface MyRepository { 
    void save(Object obj); 
} 

public class MyRepositoryImpl implements MyRepository { 
    private final MyDao myDao; 

    @Autowired 
    public MyRepository(MyDao myDao) { 
     this.myDao = myDao 
    } 

    public void save(Object obj) { 
     if (obj.isNew()) 
      myDao.create(obj) 
     } 
    } 
}