如何决定 java.net.BindException: 地址已使用

我正在尝试配置服务器 tomcat 8 在 ubuntu 14 通过数字海洋在这本教科书的帮助下
http://https://www.digitalocea ... 14-04
. 但我无法进入屏幕保护程序 tomcat.

一切顺利，直到我到达我开始的舞台 tomcat

sudo initctl start tomcat

这返回了一条消息

tomcat start/running, 过程 9180

但是当我输入的时候 url

my-droplet-ip-address:8080

屏幕保护程序永远不会加载。

我读过你可以开始 tomcat 从

sh startup.sh

虽然当我这样做时， catalina.out 给了我一条错误消息

31-Jul-2016 05:37:41.018 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]

31-Jul-2016 05:37:41.086 SEVERE [main] org.apache.coyote.AbstractProtocol.init Failed to initialize end point associated with ProtocolHandler ["http-nio-8080"]

 java.net.BindException: Address already in use

 at sun.nio.ch.Net.bind0/Native Method/

 at sun.nio.ch.Net.bind/Net.java:433/

 at sun.nio.ch.Net.bind/Net.java:425/

 at sun.nio.ch.ServerSocketChannelImpl.bind/ServerSocketChannelImpl.java:223/

 at sun.nio.ch.ServerSocketAdaptor.bind/ServerSocketAdaptor.java:74/

 at org.apache.tomcat.util.net.NioEndpoint.bind/NioEndpoint.java:229/

 at org.apache.tomcat.util.net.AbstractEndpoint.init/AbstractEndpoint.java:866/

 at org.apache.tomcat.util.net.AbstractJsseEndpoint.init/AbstractJsseEndpoint.java:213/

 at org.apache.coyote.AbstractProtocol.init/AbstractProtocol.java:558/

 at org.apache.coyote.http11.AbstractHttp11Protocol.init/AbstractHttp11Protocol.java:65/

 at org.apache.catalina.connector.Connector.initInternal/Connector.java:1010/

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:107/

 at org.apache.catalina.core.StandardService.initInternal/StandardService.java:549/

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:107/

 at org.apache.catalina.core.StandardServer.initInternal/StandardServer.java:873/

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:107/

 at org.apache.catalina.startup.Catalina.load/Catalina.java:606/

 at org.apache.catalina.startup.Catalina.load/Catalina.java:629/

 at sun.reflect.NativeMethodAccessorImpl.invoke0/Native Method/

 at sun.reflect.NativeMethodAccessorImpl.invoke/NativeMethodAccessorImpl.java:62/

 at sun.reflect.DelegatingMethodAccessorImpl.invoke/DelegatingMethodAccessorImpl.java:43/

 at java.lang.reflect.Method.invoke/Method.java:498/

 at org.apache.catalina.startup.Bootstrap.load/Bootstrap.java:311/

 at org.apache.catalina.startup.Bootstrap.main/Bootstrap.java:494/



31-Jul-2016 05:37:41.089 SEVERE [main] org.apache.catalina.core.StandardService.initInternal Failed to initialize connector [Connector[HTTP/1.1-8080]]

 org.apache.catalina.LifecycleException: Failed to initialize component [Connector[HTTP/1.1-8080]]

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:111/

 at org.apache.catalina.core.StandardService.initInternal/StandardService.java:549/

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:107/

 at org.apache.catalina.core.StandardServer.initInternal/StandardServer.java:873/

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:107/

 at org.apache.catalina.startup.Catalina.load/Catalina.java:606/

 at org.apache.catalina.startup.Catalina.load/Catalina.java:629/

 at sun.reflect.NativeMethodAccessorImpl.invoke0/Native Method/

 at sun.reflect.NativeMethodAccessorImpl.invoke/NativeMethodAccessorImpl.java:62/

 at sun.reflect.DelegatingMethodAccessorImpl.invoke/DelegatingMethodAccessorImpl.java:43/

 at java.lang.reflect.Method.invoke/Method.java:498/

 at org.apache.catalina.startup.Bootstrap.load/Bootstrap.java:311/

 at org.apache.catalina.startup.Bootstrap.main/Bootstrap.java:494/

Caused by: org.apache.catalina.LifecycleException: Protocol handler initialization failed

 at org.apache.catalina.connector.Connector.initInternal/Connector.java:1012/

 at org.apache.catalina.util.LifecycleBase.init/LifecycleBase.java:107/

 ... 12 more

Caused by: java.net.BindException: Address already in use

 at sun.nio.ch.Net.bind0/Native Method/

 at sun.nio.ch.Net.bind/Net.java:433/

 at sun.nio.ch.Net.bind/Net.java:425/

 at sun.nio.ch.ServerSocketChannelImpl.bind/ServerSocketChannelImpl.java:223/

 at sun.nio.ch.ServerSocketAdaptor.bind/ServerSocketAdaptor.java:74/

 at org.apache.tomcat.util.net.NioEndpoint.bind/NioEndpoint.java:229/

 at org.apache.tomcat.util.net.AbstractEndpoint.init/AbstractEndpoint.java:866/

 at org.apache.tomcat.util.net.AbstractJsseEndpoint.init/AbstractJsseEndpoint.java:213/

 at org.apache.coyote.AbstractProtocol.init/AbstractProtocol.java:558/

 at org.apache.coyote.http11.AbstractHttp11Protocol.init/AbstractHttp11Protocol.java:65/

 at org.apache.catalina.connector.Connector.initInternal/Connector.java:1010/

 ... 13 more



31-Jul-2016 05:37:41.091 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8181"]

31-Jul-2016 05:37:41.105 INFO [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read

31-Jul-2016 05:37:41.117 INFO [main] org.apache.catalina.startup.Catalina.load Initialization processed in 1568 ms

31-Jul-2016 05:37:41.180 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service Catalina

31-Jul-2016 05:37:41.180 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.4

31-Jul-2016 05:37:41.211 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /opt/tomcat/webapps/host-manager

我检查了哪些端口使用 sudo lsof-i, 并尝试使用需要的端口杀死流程 tomcat, 以及改变不同的端口 server.xml, 避免此错误。 但它继续发生，无论我做什么。

我最近看到了这个链接

https://www.digitalocean.com/c ... ava-7
建议

也许这是由于熵来源的问题。 设置参数

-Djava.security.egd=file:/dev/./urandom 无论是in. catalina.sh, 无论是in. /etc/default/tomcat .

问题是我找不到文件 /etc/default/tomcat 我无法理解在哪里 catalina.sh 添加作者提供的此字符串。

为什么我无法跑 tomcat, 到达屏幕保护程序？ 这是一个与之相关的问题 entroy source? 如果是这样，那么在哪里 catalina.sh 这个字符串吗？ 如果没有，那么对我如何解决这个问题的任何建议都将得到理解。