启用 Spring AOP 时出现异常（创建 RESTful 服务时）

Question

我正在学习 Spring 并且正在创建 RESTful 服务。我正在尝试使用 AOP 找出所有 public 方法的执行时间。但是，在创建 Servlet 期间出现异常。

下面是我的代码。

src/main/webapp/WEB-INF/springmvc-servlet.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:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd"
>

    <context:component-scan base-package="com" />
    <context:annotation-config />
    <mvc:annotation-driven />
    <aop:aspectj-autoproxy/>
</beans>

com.aop.ExecutionTimeLoggingSpringAOP :

@Component
@Aspect
public class ExecutionTimeLoggingSpringAOP {

    final static Logger logger = Logger.getLogger(ExecutionTimeLoggingSpringAOP
.class);

    @Around("execution(public * *(..))")
    public Object profile(ProceedingJoinPoint pjp) throws Throwable {
        long startTime = System.nanoTime();
        String className = pjp.getTarget().getClass().getCanonicalName();
        String methodName = pjp.getSignature().getName();

        Object output = pjp.proceed();

        long elapsedTime = System.nanoTime() - startTime;

        logger.debug("Execution of " + className + "#" + methodName
                + " ended in " + new BigDecimal(elapsedTime).divide(
        new BigDecimal(1000000)) + " milliseconds");

        return output;
    }
}

下面给出的是我得到的例外，

javax.servlet.ServletException: Servlet.init() for servlet springmvc threw exception
...
java.lang.Thread.run(Thread.java:745)
root cause

org.springframework.beans.factory.BeanCreationException: Error creating bean with name
'org.springframework.web.servlet.mvc.method.
annotation.RequestMappingHandlerMapping#0': 
Initialization of bean failed; nested exception is org.springframework.beans.
ConversionNotSupportedException: ....

我是不是遗漏了什么？

PS ：REST API 在不使用 AOP 时工作（即当 aop:aspectj-autoproxy 从 springmvc-servlet.xml 中删除时）

Answer 1

您的切入点表达式过于笼统。这将为所有 Spring 托管 bean（包括基础结构 bean）创建代理。尝试更具体（类似于 execution(* com.yourcompany.*.*(..))）仅代理您的组件类.

启用 Spring AOP 时出现异常（创建 RESTful 服务时）

Exception in enabling Spring AOP (while creating RESTful service)

java

spring

spring-mvc

spring-aop