Java:创建名称为 'loadTimeWeaver' 的 bean 时出错？

Question

我目前正在做一个 Maven 项目，但每次我尝试部署我的 war 时，我都会遇到以下异常:

ERROR [DispatcherPortlet:276] Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.context.weaving.AspectJWeavingEnabler#0': Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'loadTimeWeaver': Initialization of bean failed;  nested exception is java.lang.IllegalStateException: ClassLoader [org.apache.catalina.loader.WebappClassLoader] does NOT provide an 'addTransformer(ClassFileTransforme r)' method. Specify a custom LoadTimeWeaver or start your Java virtual machine with Spring's agent: -javaagent:org.springframework.instrument.jar
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1097)
        at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:661)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:446)
        at org.springframework.web.portlet.FrameworkPortlet.createPortletApplicationContext(FrameworkPortlet.java:356)
        at org.springframework.web.portlet.FrameworkPortlet.initPortletApplicationContext(FrameworkPortlet.java:294)
        at org.springframework.web.portlet.FrameworkPortlet.initPortletBean(FrameworkPortlet.java:268)
        at org.springframework.web.portlet.GenericPortletBean.init(GenericPortletBean.java:120)

我根本不明白当我把一切都准备好时为什么会出现这个错误。请检查我在 POM.xml 中的声明

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.4</version>
    <configuration>
            <forkMode>once</forkMode>
            <argLine>
                 -javaagent:"path\spring-instrument-3.1.0.RELEASE.jar"
            </argLine>
            <useSystemClassloader>true</useSystemClassloader>
    </configuration>
</plugin>

请指导。

Answer 1

如果您正在使用 tomcat bundle 并在 Tomcat 中启用 load-time-weaving 添加 Spring Instrument Tomcat到 Tomcat 的 lib 目录和 context.xml 中的以下内容，位于您的 tomcat 的 META-INF 目录中:

<Context path="/test">
    <Loader loaderClass="org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader"/>
</Context>

引用Spring Docs在 tomcat 的配置上。

注意:tomcat 的配置因版本而异。