Spring 2.0中 AOP的编程：
[color=red]nested exception： 该嵌套异常往往是导入包是嵌套造成的，将包remove后再重新导入[/color]
方式一：
publicclass User {
publicvoid method() {
System.out.println("in method1");
}
}
publicclass LogBean {
public Object aroundLogCalls(ProceedingJoinPoint joinPoint) throws Throwable {
System.out.println("before invoke method:"
+ joinPoint.getSignature().getName());
Object object = joinPoint.proceed();
System.out.println("after invoke method:"
+ joinPoint.getSignature().getName());
return object;
}

}
采用在xml配置aop:
<?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.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 注意上面的四个地址用空格分开 -->
<aop:config>
<!-- expression 表示要执行的匹配表达式，这里匹配所有的public方法，但是去除logger类的所有方法，防止无限调用-->

<aop:pointcut id="loggableCalls"
expression="execution(public * *(..)) "/>


<aop:aspect id="logAspect" ref="logBean">
<aop:around pointcut-ref="loggableCalls"
method="aroundLogCalls" />
</aop:aspect>

</aop:config>
<bean id="logBean" class="LogBean" />
<bean id="user" class="User" />
方式二：
采用标注：
@Aspect
publicclass LogAspect {

@Pointcut("execution(public * *(..))")
publicvoid publicMethods() {
}
@Around("publicMethods()")
public Object aroundLogCalls(ProceedingJoinPoint joinPoint)
throws Throwable {
System.out.println("before invoke method:"
+ joinPoint.getSignature().getName());
Object object = joinPoint.proceed();
System.out.println("after invoke method:"
+ joinPoint.getSignature().getName());
return object;
}
}
<?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.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 注意上面的四个地址用空格分开 -->

<aop:aspectj-autoproxy />

<!-- 或者使用以下定义

<bean class="org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator" />

-->
<bean id="logAspect" class="LogAspect" />
<bean id="user" class="User" />

</beans>
这样配置文件就就只有一个<aop:aspectj-autoproxy />很简单。
出现的问题解决：
问题1：Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory at org.springframework.util.ClassUtils.<clinit>(ClassUtils.java:67) at org.springframework.core.io.DefaultResourceLoader.<init>(DefaultResourceLoader.java:52) at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:184) at org.springframework.context.support.AbstractRefreshableApplicationContext.<init>(AbstractRefreshableApplicationContext.java:80) at org.springframework.context.support.AbstractXmlApplicationContext.<init>(AbstractXmlApplicationContext.java:58) at
需要加上：commons-logging.jar log4j-1.2.11.jar

问题2：Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [text.xml]; nested exception is java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException
Caused by: java.lang.NoClassDefFoundError: org/aspectj/weaver/reflect/ReflectionWorld$ReflectionWorldException
at java.lang.Class.forName0(Native Method)

需要加上：aspectjweaver.jar

问题3：Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'logBean' defined in class path resource [text.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.
Caused by: org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.
需要加上：cglib-2.1.3.jar


问题4：xception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'logBean' defined in class path resource [text.xml]: Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: org/objectweb/asm/Type
Caused by: java.lang.NoClassDefFoundError: org/objectweb/asm/Type
at net.sf.cglib.core.TypeUtils.parseType(TypeUtils.java:180)
需要加上：asm.jar
转载：http://pengchua.iteye.com/blog/142879
[color=orange]
问题5： CGLIB Enhancement failed: com.bowen.domain.Schools
java.lang.NoSuchMethodError: org.objectweb.asm.ClassVisitor.visit(IILjava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;)V
at net.sf.cglib.core.ClassEmitter.begin_class(ClassEmitter.java:77)
at net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:173)
at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25)
解决：由于不同版本让我想到了可能会因为其它三方包是不同版本引起的最新的MyEclipse，所以里面的Hibernate也是最新的3.1（它里面还带有一个3.0版本的）
删除 多余的包 Hibernate3.1[/color]现象2：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in resource [/WEB-INF/dataAccessContext-hibernate.xml] of ServletContext: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: javax/transaction/TransactionManager
java.lang.NoClassDefFoundError: javax/transaction/TransactionManager

原因：缺少jta.jar

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

现象3：

java.lang.NoClassDefFoundError: org/dom4j/Attribute
缺dom4j.jar
java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
缺ehcache.jar
java.lang.NoClassDefFoundError: net/sf/cglib/core/KeyFactory
缺cglib-full.jar