Caused by: java.lang.NoClassDefFoundError: org/apache/tomcat/util/descriptor/tld/TldParser

最近尝试着用spring boot ，页面模版使用的jsp，在pom里配置了对jsp的支持：

<dependency>    <groupId>org.apache.tomcat.embed</groupId>    <artifactId>tomcat-embed-jasper</artifactId></dependency>

发现tomcat启动的时候报错：

?? 26, 2017 2:20:19 ?? org.apache.catalina.core.ContainerBase addChildInternal??: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1863)    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:301)    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:618)    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)    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:301)    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)    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 javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)    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:346)    at sun.rmi.transport.Transport$1.run(Transport.java:200)    at sun.rmi.transport.Transport$1.run(Transport.java:197)    at java.security.AccessController.doPrivileged(Native Method)    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)at java.security.AccessController.doPrivileged(Native Method)at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at java.lang.Thread.run(Thread.java:748)Caused by: java.lang.NoClassDefFoundError: org/apache/tomcat/util/descriptor/tld/TldParserat org.apache.jasper.servlet.TldScanner.<init>(TldScanner.java:84)at org.apache.jasper.servlet.JasperInitializer.newTldScanner(JasperInitializer.java:118)    at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:99)    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5623)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)    ... 42 moreCaused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.descriptor.tld.TldParser    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)    ... 47 more

原因还是依赖了spring boot 内部提供的tomcat的问题，将上面pom的配置改成下面这样即可（作用域设置成依赖外部tomcat容器提供的jsp）：

<dependency>    <groupId>org.apache.tomcat.embed</groupId>    <artifactId>tomcat-embed-jasper</artifactId>    <scope>provided</scope></dependency>