tomcat启动卡住
新部署的项目启动tomcat后一直停在org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.16，卡在了org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory将近7分钟。
# tail -500f ../logs/catalina.2018-07-04.out
......
04-Jul-2018 16:28:59.520 INFO org.apache.catalina.startup.Catalina.load Initialization processed in 328 ms
04-Jul-2018 16:28:59.534 INFO org.apache.catalina.core.StandardService.startInternal Starting service
04-Jul-2018 16:28:59.534 INFO org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.16
......
卡了近7分钟
......
04-Jul-2018 16:35:00.238 WARNING org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using took milliseconds.
04-Jul-2018 16:35:00.273 INFO org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory
....
解决方法：
修改jdk的java.security文件securerandom.source项
# grep "source=file" /usr/java/jdk1.8.0_161/jre/lib/security/java.security
#securerandom.source=file:/dev/random
securerandom.source=file:/dev/./urandom
#
将securerandom.source=file:/dev/random修改为securerandom.source=file:/dev/./urandom
linux或者部分unix系统提供随机数设备是/dev/random 和/dev/urandom ，两个有区别，urandom安全性没有random高，但random需要时间间隔生成随机数。jdk默认调用random。可通过 head -n 1 /devrandom 查看是否的系统会出现伪随机数提供等待，
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