java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start com

Maven webapp项目在tomcat上run on server时报错：

java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]    at java.util.concurrent.FutureTask.report(FutureTask.java:122)    at java.util.concurrent.FutureTask.get(FutureTask.java:192)    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)    at java.util.concurrent.FutureTask.run(FutureTask.java:266)    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:745)Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Tomcat].StandardHost[localhost].StandardContext[]]

原因：jar包依赖冲突，在maven项目中，jstl自身依赖（jstl间接依赖老版本的api）的servet-api和jsp-api和容器提供的servlet-api、jsp-api冲突（即pom.xml中指定的？？）。
解决方法：
(1) 在pom.xml中将servlet-api的 dependency标签的scope设置为provided，保证这个Servlet-api在项目运行的时候不会引入，从而与容易提供的发生冲突。