Spring AOP日志记录拦截器和JAXB问题 [英] Spring AOP Logging Interceptor and JAXB issue

问题描述

我正在尝试在我的应用程序中实现日志记录方面.这是我第一次尝试AOP，因此，如果我缺少明显的内容，请告诉我.为了实现外部jar的编织，我正在尝试实现加载时间weaver.我确实在应用程序上下文中指定了加载时间编织器，并在context.xml文件中与aop.xml一起提到了TomcatInstrumentableClassLoader.我的应用程序是Spring MVC REST应用程序，还利用JAXB内容协商.在应用程序启动期间，从我提到的类构建JAXBContext时，JAXB会出现空指针异常错误.但是，如果没有TomcatInstrumentableClassLoader，则JAXBContext会正常初始化，并且一切正常.但是，如果没有TomcatInstrumentableClassLoader加载时间，编织将无法进行.有什么我可以解决的问题吗?任何帮助将不胜感激.

I am trying to implement logging aspect into my application. This is the first time I am attempting AOP, so please let me know if I am missing something obvious. In order to achieve weaving external jars, I am trying to implement load time weaver. I did specify the load-time-weaver in my application context and mentioned TomcatInstrumentableClassLoader in my context.xml file along with the aop.xml. My application is a Spring MVC REST application and utilizes JAXB content negotiation as well. During the application startup, JAXB errors out with a null pointer exception while building the JAXBContext from the classes I mentioned. However, without the TomcatInstrumentableClassLoader JAXBContext is initialized normally and everything works ok. But, without the TomcatInstrumentableClassLoader load time weaving will not work. Is there something I can do to fix this issue? Any help is greatly appreciated.

我的应用上下文:

    ....
    <aop:aspectj-autoproxy/>
    <context:load-time-weaver aspectj-weaving="on" />
    .....
    <oxm:jaxb2-marshaller id="jaxb2Marshaller">
    <oxm:class-to-be-bound name="core.jaxb.DocPackage"/>
    <oxm:class-to-be-bound name="core.jaxb.life.Life"/>
    <oxm:class-to-be-bound name="core.jaxb.corr.Corr"/>
    <oxm:class-to-be-bound name="core.jaxb.ps.PS"/>
</oxm:jaxb2-marshaller>

这是我的context.xml:

Here is my context.xml:

    <?xml version="1.0" encoding="UTF-8"?>
    <Context>
<Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader" useSystemClassLoaderAsParent="false"/>
</Context>

我的aop.xml:

     <!DOCTYPE aspectj PUBLIC
    "-//AspectJ//DTD//EN" "http://www.eclipse.org/aspectj/dtd/aspectj.dtd">
    <aspectj>
<weaver>
    <!-- only weave classes in our application-specific packages -->
    <include within="core.aspects.*"/>
</weaver>
<aspects>
    <!-- weave in just this aspect -->        
    <aspect name="core.aspects.LoggerAspect"/>
</aspects>

这是堆栈跟踪:

    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jaxb2Marshaller': Invocation of init method failed; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1420)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:844)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:786)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:703)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:478)
... 23 more
     Caused by: java.lang.NullPointerException
at java.util.EnumMap.<init>(EnumMap.java:113)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeEnumLeafInfoImpl.<init>(RuntimeEnumLeafInfoImpl.java:72)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.createEnumLeafInfo(RuntimeModelBuilder.java:94)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.createEnumLeafInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:213)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:89)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:198)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:84)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:304)
at com.sun.xml.internal.bind.v2.model.impl.SingleTypePropertyInfoImpl.getTarget(SingleTypePropertyInfoImpl.java:79)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeValuePropertyInfoImpl.getTarget(RuntimeValuePropertyInfoImpl.java:55)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeValuePropertyInfoImpl.getTarget(RuntimeValuePropertyInfoImpl.java:39)
at com.sun.xml.internal.bind.v2.model.impl.SingleTypePropertyInfoImpl.ref(SingleTypePropertyInfoImpl.java:73)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeValuePropertyInfoImpl.ref(RuntimeValuePropertyInfoImpl.java:59)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeValuePropertyInfoImpl.ref(RuntimeValuePropertyInfoImpl.java:39)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:244)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:89)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:198)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:84)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:304)
at com.sun.xml.internal.bind.v2.model.impl.TypeRefImpl.calcRef(TypeRefImpl.java:81)
at com.sun.xml.internal.bind.v2.model.impl.TypeRefImpl.getTarget(TypeRefImpl.java:58)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:47)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:40)
at com.sun.xml.internal.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:63)
at com.sun.xml.internal.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:61)
at java.util.AbstractList$Itr.next(AbstractList.java:345)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:244)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:89)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:198)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:84)
at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:304)
at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:319)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:430)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:277)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1100)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:143)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:110)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:202)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:376)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:522)
at org.springframework.oxm.jaxb.Jaxb2Marshaller.createJaxbContextFromClasses(Jaxb2Marshaller.java:372)
at org.springframework.oxm.jaxb.Jaxb2Marshaller.getJaxbContext(Jaxb2Marshaller.java:331)
at org.springframework.oxm.jaxb.Jaxb2Marshaller.afterPropertiesSet(Jaxb2Marshaller.java:317)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
... 33 more

推荐答案

哇-有很多实现日志记录的方法！这是我曾经取得巨大成功的策略:

Whoa - lot's of implementation for logging! Here's a strategy I have used to great success:

1. 创建一个用AspectJ @Aspect注释和Spring @Component注释注释的方面，因为一个使它成为一个方面，而后者使它成为一个Spring bean
2. 通过配置Speing AOP命名空间，然后设置<aop:aspectj-autoproxy>
，在您的应用中启用各个方面
3. 在方面中创建一个方法，并用@Around进行注释，以使其在处理程序方法执行之前和之后运行.将方法配置为仅对Controller软件包中的类运行，如下所示:@Around("execution(* com.mycontrollerpackage.(.*(..))")

1. Create an aspect annotated with the AspectJ @Aspect annotation, and the Spring @Component annotation, as one makes it an aspect, the latter makes it a Spring bean
2. Enable aspects in your app by configuring the Speing AOP namespace, then setting <aop:aspectj-autoproxy>
3. Create a method in the aspect, annotated with @Around so that it runs before and after the handler method execution. Configure the method to run only for classes in your Controller package, like so:@Around("execution(* com.mycontrollerpackage.(.*(..))")

现在，您具有在方法执行之前和之后运行的方面，允许您记录有关请求的信息，从传递的信息到花费的时间.您还可以执行安全检查，设置ThreadLocal变量以指导执行等.各种好东西.

Now you have an aspect that runs before and after method execution, allowing you to log information about requests, from what was passed in to how long it took to take. You can also perform security checks, set ThreadLocal variables to guide execution, etc. All kinds of good stuff.

这篇关于Spring AOP日志记录拦截器和JAXB问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！