"Address already in use: bind" when running Spring Boot application

Question

I have a problem with running my sample Spring Boot Application. When I try to run it, this error occurs:

 java.net.BindException: Address already in use: bind
            at sun.nio.ch.Net.bind0(Native Method)
            at sun.nio.ch.Net.bind(Unknown Source)
            at sun.nio.ch.Net.bind(Unknown Source)
            at sun.nio.ch.ServerSocketChannelImpl.bind(Unknown Source)
            at sun.nio.ch.ServerSocketAdaptor.bind(Unknown Source)
            at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:473)
o.apache.catalina.core.StandardService   : Failed to initialize connector [Connector[org.apache.coyote.http11.Http11NioProtocol-8080]]

    org.apache.catalina.LifecycleException: Failed to initialize component [Connector[org.apache.coyote.http11.Http11NioProtocol-8080]]
            at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)
            at org.apache.catalina.core.StandardService.initInternal(StandardService.java:559)
            at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
            at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:814)
            at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
            at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:139)
            at org.apache.catalina.startup.Tomcat.start(Tomcat.java:335)
            at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.initialize(TomcatEmbeddedServletContainer.java:57)
            at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.<init>(TomcatEmbeddedServletContainer.java:52)
            at 

Answer 1

Is it ok the first time you run it, and run it again you get an error? If this is the case, You need to stop service before running again. Here is a way to stop. Click the stop button that looks like this:

Answer 2

"Address already in use" means, there is already another application running on port 8080. Use your OS tools to find that process and end it, before you start your application, or let your application run on another port. If you use an embedded server in your Boot application, you can specify the following property:

server.port=8085 

Of course you can choose whatever port you want.