Tomcat9在CentOS7上啓動慢解決辦法，實測可行

1.修改jdk目錄下的java.security文件

vim /usr/lib/jvm/jdk1.8.0/jre/lib/security/java.security

將以下配置
securerandom.source=file:/dev/random

改成
securerandom.source=file:/dev/urandom

2.修改tomcat9下conf的catalina.properties

將tomcat.util.scan.StandardJarScanFilter.jarsToSkip=後面加載的jar包刪除

改成tomcat.util.scan.StandardJarScanFilter.jarsToSkip=*.jar