今天在服务器上部署项目，忘了项目已经在运行中了，所以没有停直接就启动了项目，结果一看日志报错了，原来是端口被占用了：

14:21:43.803 [main] INFO org.apache.coyote.http11.Http11NioProtocol - [log,180] - Starting ProtocolHandler ["http-nio-13301"]

14:21:43.810 [main] ERROR org.apache.catalina.core.StandardService - [log,182] - Failed to start connector [Connector[HTTP/1.1-13301]]

org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-13301]]

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167)

        at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225)

        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:256)

        at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:198)

        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:300)

        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:162)

        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:553)

        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)

        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780)

        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1277)

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1265)

        at cn.sciencedb.SdbProjectVersionApplication.main(SdbProjectVersionApplication.java:19)

        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.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)

        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)

        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)

        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)

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

        at org.apache.catalina.connector.Connector.startInternal(Connector.java:1020)

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

        ... 21 common frames omitted

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:219)

        at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1151)

        at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:591)

        at org.apache.catalina.connector.Connector.startInternal(Connector.java:1018)

        ... 22 common frames omitted

14:21:43.820 [main] INFO  org.apache.coyote.http11.Http11NioProtocol - [log,180] - Pausing ProtocolHandler ["http-nio-13301"]

解决方法：将被占用端口的服务停掉或者是将项更该一个端口在运行。