使用BeanUtils下ConvertUtils时，项目启动就报错

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我是靠谱客的博主动人导师，最近开发中收集的这篇文章主要介绍使用BeanUtils下ConvertUtils时，项目启动就报错，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

自己在做一个小项目时用到了日期转换，使用了ConvertUtils.register注册转换器，但是项目在编译阶段就报错了。

下面是报错信息，主要是说 java.lang.NoClassDefFoundError: org/apache/commons/beanutils/Converter 没有找见Converter类。

12-Feb-2020 19:36:04.951 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyMall]]
   at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:755)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:731)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
   at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1730)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
   at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:485)
   at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:434)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
   at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
   at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
   at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
   at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
   at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
   at sun.rmi.transport.Transport$1.run(Transport.java:200)
   at sun.rmi.transport.Transport$1.run(Transport.java:197)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
   at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
   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.NoClassDefFoundError: org/apache/commons/beanutils/Converter
   at java.lang.Class.getDeclaredFields0(Native Method)
   at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
   at java.lang.Class.getDeclaredFields(Class.java:1916)
   at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
   at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:269)
   at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:137)
   at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)
   at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:336)
   at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:776)
   at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:307)
   at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
   at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
   at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5262)
   at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
   ... 44 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.beanutils.Converter
   at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1352)
   at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
   ... 58 more

12-Feb-2020 19:36:04.957 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method manageApp
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyMall]]
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:731)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
   at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1730)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
   at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:485)
   at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:434)
[2020-02-12 07:36:05,004] Artifact MyMall:Web exploded: Error during artifact deployment. See server log for details.
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
   at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
   at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
   at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
   at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
   at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
   at sun.rmi.transport.Transport$1.run(Transport.java:200)
   at sun.rmi.transport.Transport$1.run(Transport.java:197)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
   at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
   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)

12-Feb-2020 19:36:04.958 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method createStandardContext
javax.management.RuntimeOperationsException: Exception invoking method manageApp
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:308)
   at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:485)
   at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:434)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
   at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
   at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
   at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
   at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
   at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
   at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
   at java.security.AccessController.doPrivileged(Native Method)
   at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
   at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
   at sun.rmi.transport.Transport$1.run(Transport.java:200)
   at sun.rmi.transport.Transport$1.run(Transport.java:197)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
   at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
   at java.security.AccessController.doPrivileged(Native Method)
   at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
   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: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/MyMall]]
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:731)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
   at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1730)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
   ... 35 more

百度查了半天，大多说是项目没有导入commons-beanutils的jar包。我的项目是maven项目，依赖已经在pom.xml中添加了。

<!-- https://mvnrepository.com/artifact/commons-beanutils/commons-beanutils -->
<dependency>
    <groupId>commons-beanutils</groupId>
    <artifactId>commons-beanutils</artifactId>
    <version>1.8.3</version>
</dependency>

困扰了我两个多小时，后来在网上偶然看到有网友说，有可能是tomcat启动时没有找到commons-beanutils的jar包，需要把jar包复制到tomcat的lib中一份。试了一下果然解决了问题。