如何解决java.net.BindException:地址已在使用中

Question

我试图通过数学海洋在ubuntu 14上设置一个tomcat 8服务器,使用本教程https://www.digitalocean.com/community/tutorials/how-to-install-apache-tomcat-8-on-ubuntu- 14-04.但是我无法访问tomcat的启动页面.

一切顺利,直到我到达启动tomcat的步骤

sudo initctl启动tomcat

这会返回一条消息

tomcat启动/运行,进程9180

但是当我输入网址时

我滴-IP地址:8080

启动页面永远不会加载.

我已经读过你可以用tomcat启动它了

sh startup.sh

虽然我这样做catalina.out给了我错误信息

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

我已经检查了sudo lsof -i正在使用哪些端口,并尝试查杀使用tomcat所需端口的进程,以及更改server.xml中的各个端口以避免此错误.但无论我做什么,它都会不断发生.

我最近也看到了这个链接

https://www.digitalocean.com/community/questions/tomcat-not-starting-in-ubuntu-14-04-tomcat-7-and-java-7

这表明

这可能是由于熵源问题.设置选项

-djava.security.egd = file:/ dev /./ urandom在catalina.sh或/ etc/default/tomcat中.

这个问题是我找不到文件/ etc/default/tomcat,也无法找出catalina.sh中添加作者建议的这一行的位置.

为什么我不能启动tomcat进入启动页面？这真的是一个与entroy相关的问题吗？如果是这样,catalina.sh中的这一行会去哪里？如果没有,任何建议如何解决这个问题将不胜感激.

Answer 1

您已经知道此问题的根本原因是您的应用程序尝试连接到某个其他进程(Java或非Java)正在使用的特定端口.你在这里答案:

在server.xml中找到这四个端口

1. HTTP/1.1
2. Tomcat管理端口.
3. AJP/1.3
4. SSL(如果已启用).

使用netstat命令查找正在使用这些端口的进程.

netstat -nap | grep <port>

现在,既然您已找到违规进程,则可以终止该进程并重新启动您的进程,如果终止该进程正常,否则,请更改server.xml中的端口

为所有4个端口执行此操作,然后重新启动tomcat.检查catalina.out,如果一切顺利,您将能够访问您的应用程序.

这真的是一个与entroy相关的问题吗？如果是这样,catalina.sh中的这一行会去哪里？

我不知道它是否与entroy source有关,但你可以 -Djava.security.egd=file:/dev/./urandom放入catalina.sh.JAVA_OPTS在catalina.sh中找到并用分号(;)分隔现有值.

如果你正在使用Eclips IDE让我知道.这一切都很简单.希望它会有所帮助.