java.net.BindException: Address already in use:80 linux

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本文记录了一次启动Apache Tomcat时遇到80端口被占用的问题，并提供了详细的排查和解决方案，包括如何查找占用端口的进程及终止该进程。

Jul 9, 2012 5:06:14 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/java/jdk1.5.0_22/jre/lib/amd64/server:/usr/java/jdk1.5.0_22/jre/lib/amd64:/usr/java/jdk1.5.0_22/jre/../lib/amd64
Jul 9, 2012 5:06:14 PM org.apache.coyote.http11.Http11BaseProtocol init
SEVERE: Error initializing endpoint
java.net.BindException: Address already in use:80
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:298)
at org.apache.coyote.http11.Http11BaseProtocol.init(Http11BaseProtocol.java:139)
at org.apache.catalina.connector.Connector.initialize(Connector.java:1017)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:578)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:782)
at org.apache.catalina.startup.Catalina.load(Catalina.java:504)
at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Jul 9, 2012 5:06:14 PM org.apache.catalina.startup.Catalina load
SEVERE: Catalina.start
LifecycleException: Protocol handler initialization failed: java.net.BindException: Address already in use:80
at org.apache.catalina.connector.Connector.initialize(Connector.java:1019)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:578)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:782)
at org.apache.catalina.startup.Catalina.load(Catalina.java:504)
at org.apache.catalina.startup.Catalina.load(Catalina.java:524)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:267)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Jul 9, 2012 5:06:14 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 669 ms

解决方法如下：

第一，使用如下命令查看哪个进程正在使用80端口：

netstat -nlutp

[root@zhang-12-07 bin]# netstat -nlutp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      3998/mysqld
tcp        0      0 :::80                       :::*                        LISTEN      27285/java
tcp        0      0 :::9009                     :::*                        LISTEN      27285/java
tcp        0      0 :::22                       :::*                        LISTEN      2112/sshd
udp        0      0 0.0.0.0:5353                0.0.0.0:*                               2157/avahi-daemon:
udp        0      0 0.0.0.0:54133               0.0.0.0:*                               2157/avahi-daemon:
udp        0      0 :::38051                    :::*                                    2157/avahi-daemon:
udp        0      0 :::5353                     :::*                                    2157/avahi-daemon:

第二，使用如下命令结束正在使用80端口的进程：

[root@zhang-12-07 bin]# kill -9 27285

再次查看，可以看到已经被kill了！
[root@zhang-12-07 bin]# netstat -nlutp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      3998/mysqld
tcp        0      0 :::22                       :::*                        LISTEN      2112/sshd
udp        0      0 0.0.0.0:5353                0.0.0.0:*                               2157/avahi-daemon:
udp        0      0 0.0.0.0:54133               0.0.0.0:*                               2157/avahi-daemon:
udp        0      0 :::38051                    :::*                                    2157/avahi-daemon:
udp        0      0 :::5353                     :::*                                    2157/avahi-daemon: