新部署的項(xiàng)目啟動(dòng)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 [/opt/tomcat/webapps/host-manager]
將近7分鐘。

[root@app-web-2-64-0002 bin]# tail -500f ../logs/catalina.2018-07-04.out ...... 04-Jul-2018 16:28:59.520 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 328 ms 04-Jul-2018 16:28:59.534 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina] 04-Jul-2018 16:28:59.534 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.16 ...... 卡了近7分鐘 ...... 04-Jul-2018 16:35:00.238 WARNING [localhost-startStop-1] org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [360,548] milliseconds. 04-Jul-2018 16:35:00.273 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [/opt/tomcat/webapps/host-manager] ....

解決方法：
修改jdk的java.security文件securerandom.source項(xiàng)

[root@app-web-2-64-0002 bin]# grep "source=file" /usr/java/jdk1.8.0_161/jre/lib/security/java.security #securerandom.source=file:/dev/random securerandom.source=file:/dev/./urandom [root@app-web-2-64-0002 bin]#

將securerandom.source=file:/dev/random修改為securerandom.source=file:/dev/./urandom

linux或者部分unix系統(tǒng)提供隨機(jī)數(shù)設(shè)備是/dev/random 和/dev/urandom ，兩個(gè)有區(qū)別，urandom安全性沒有random高，但random需要時(shí)間間隔生成隨機(jī)數(shù)。jdk默認(rèn)調(diào)用random。可通過 head -n 1 /devrandom 查看是否的系統(tǒng)會(huì)出現(xiàn)偽隨機(jī)數(shù)提供等待，

轉(zhuǎn)載于:https://blog.51cto.com/ityunwei2017/2136206

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