云服务器tomcat部署后启动超级慢，十几分钟才能启动怎么办
1.在启动tomcat时出现这种错误，
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07:50:06.372 INFO [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
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解决方法时：把项目从tomcat_home/webapps中移出来，放在其它位置。这样做是为了避免 tomcat 加载项目两次的坑，因为配置文件中如果配置了该项目会被加载一次，而项目在 webapps 下面又会被自动重复加载一次，这个坑会引发一些莫名奇妙的问题。
2.tomcat启动超级慢，十几分钟才能启动。
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12-Oct-2017 14:20:59.089 WARNING [localhost-startStop-1] org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [850,730] milliseconds.
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这个启动时间非常恐怖，其实是tomcat阻塞在那里了，具体原因是我大致了解到的是，linux根据噪声来获取随机值，键盘声等。
解决方法：jdk1.8.0_111/jre/lib/security/java.security。在你的jdk安装目录下找到这个文件，替换下面的这句话，大约在第117行
重启tomcat就好了，你会发现启动超级快哦！！！