Linux启动tomcat后执行shutdown.sh关闭时出现异常：8005. Tomcat may not be running.

本人从安装Apache到配置到启动tomcat都一帆风顺，但是startup.sh后想要shutdown.sh关闭tomcat时出现了问题。

启动tomcat成功：

关闭tomcat失败：

SEVERE: Could not contact localhost:8005. Tomcat may not be running.
SEVERE: Catalina.stop: 
java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at java.net.Socket.connect(Socket.java:528)
        at java.net.Socket.(Socket.java:425)
        at java.net.Socket.(Socket.java:208)
        at org.apache.catalina.startup.Catalina.stopServer(Catalina.java:450)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.apache.catalina.startup.Bootstrap.stopServer(Bootstrap.java:400)

        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:487)

然后到网上找了很多方法，例如修改/usr/tomcat/apache-tomcat-8.5.29/bin/catalina.sh文件，重启tomcat，重启服务器...都不成功。(后来觉得是因为本人安装的JDK为1.8，如果JDK为1.7或者1.6，可以参考这种方法：点击打开链接)

后来参考了一篇神奇的博客：点击打开链接

解决方法：找到你的jdk安装的地方，cd进入jdk1.x.x_xx/jre/lib/security，修改文件：vim  java.security

在文件中找到securerandom.source这个设置项，将其改为：securerandom.source=file:/dev/./urandom

重启tomcat~解决！