I'm getting this error in my Java application:
ERROR o.a.catalina.core.StandardService – Failed to start connector [Connector[HTTP/1.1-9004]] org.apache.catalina.LifecycleException: Failed to start component [Connector[HTTP/1.1-9004]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:167) at org.apache.catalina.core.StandardService.addConnector(StandardService.java:225) at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.addPreviouslyRemovedConnectors(TomcatEmbeddedServletContainer.java:265) at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainer.start(TomcatEmbeddedServletContainer.java:208) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.startEmbeddedServletContainer(EmbeddedWebApplicationContext.java:297) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.finishRefresh(EmbeddedWebApplicationContext.java:145) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) at ie.aviva.app.TomcatApp.main(TomcatApp.java:31) 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) ... 13 common frames omitted Caused by: java.net.BindException: Address already in use: bind at sun.nio.ch.Net.bind0(Native Method) at sun.nio.ch.Net.bind(Net.java:461) at sun.nio.ch.Net.bind(Net.java:453) at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:222) at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:85) at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:210) at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1150) at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:591) at org.apache.catalina.connector.Connector.startInternal(Connector.java:1018) ... 14 common frames omitted
I'm guessing two of my applications are trying to start Tomcat on the same port but I've no knowledge or experience of tomcat. Also assume it's embedded in SpringBoot in some way. How do I investigate/resolve this?
You can set the server port in application.properties
server.port=8081
or application.yml:
server:
port: 8081
One of both files is probably present in src/main/resources, if not, you can create one.