Failed to introspect Class [com.ssm.controller.OrderController] from ClassLoader [ParallelWebappClas

在完成自己的项目后，在部署到linux里面时，我tomcat的项目启动不起来，找了一天的bug，最有发现包导入出错，解决如下：

ERROR ContextLoader Context initialization failedorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'orderController': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.ssm.controller.OrderController] from ClassLoader [ParallelWebappClassLoadercontext: ssm_shop_ryhdelegate: false
----------> Parent Classloader:
java.net.URLClassLoader@19469ea2
]at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:289)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineConstructorsFromBeanPostProcessors(AbstractAutowireCapableBeanFactory.java:1286)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1201)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4763)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5232)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:755)at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1016)at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1903)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.ssm.controller.OrderController] from ClassLoader [ParallelWebappClassLoadercontext: ssm_shop_ryhdelegate: false
----------> Parent Classloader:
java.net.URLClassLoader@19469ea2
]at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481)at org.springframework.util.ReflectionUtils.doWithLocalMethods(ReflectionUtils.java:321)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.determineCandidateConstructors(AutowiredAnnotationBeanPostProcessor.java:267)... 27 more
Caused by: java.lang.NoClassDefFoundError: org/apache/catalina/servlet4preview/http/HttpServletRequestat java.lang.Class.getDeclaredMethods0(Native Method)at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)at java.lang.Class.getDeclaredMethods(Class.java:1975)at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463)... 29 more
Caused by: java.lang.ClassNotFoundException: org.apache.catalina.servlet4preview.http.HttpServletRequestat org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1415)at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1223)... 33 more

我最后发现是将HttpServletRequest导错了，只要将导的包改成import javax.servlet.http.HttpServletRequest就可以了。

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