xercesImpl.jar和xml-apis.jar (系统找不到指定的文件)

springboot内置的tomcat为8.5.23，我们需要指定springboot的内置tomcat版本
修改pom.xml文件，增加<tomcat.version>7.0.90</tomcat.version>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<tomcat.version>7.0.90</tomcat.version>

org.apache.tomcat tomcat-juli ${tomcat.version}