Unable to initialize com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener

Question

I am using Vaadin with Spring boot for Kafka, Using Java corretto-11, Target Bytecode Version - 8, mvn application. The program was running fine and all of a sudden while running the program again, its throwing error as below:

18:52:01.994 [Thread-0] DEBUG org.springframework.boot.devtools.restart.classloader.RestartClassLoader - Created RestartClassLoader org.springframework.boot.devtools.restart.classloader.RestartClassLoader@5043836f
 _____  _                     ____  ____   __  __   _____         _                 _         _ 
|  ___|| |  ___  __      __  / ___||  _ \ |  \/  | |_   _| _   _ | |_   ___   _ __ (_)  __ _ | |
| |_   | | / _ \ \ \ /\ / / | |    | |_) || |\/| |   | |  | | | || __| / _ \ | '__|| | / _` || |
|  _|  | || (_) | \ V  V /  | |___ |  _ < | |  | |   | |  | |_| || |_ | (_) || |   | || (_| || |
|_|    |_| \___/   \_/\_/    \____||_| \_\|_|  |_|   |_|   \__,_| \__| \___/ |_|   |_| \__,_||_|
                                                                                                

2023-01-10 18:52:02.671  INFO 11832 --- [  restartedMain] com.example.application.Application      : Starting Application using Java 11.0.17 on ** with PID 11832 (C:\Users\Downloads\flow-crm-tutorial\flow-crm-tutorial\target\classes started by AL11106 in C:\Users\Downloads\flow-crm-tutorial)
2023-01-10 18:52:02.673  INFO 11832 --- [  restartedMain] com.example.application.Application      : No active profile set, falling back to 1 default profile: "default"
2023-01-10 18:52:02.784  INFO 11832 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2023-01-10 18:52:02.784  INFO 11832 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2023-01-10 18:52:03.934  INFO 11832 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2023-01-10 18:52:03.979  INFO 11832 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 30 ms. Found 0 JPA repository interfaces.
2023-01-10 18:52:05.288  INFO 11832 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-01-10 18:52:05.303  INFO 11832 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-01-10 18:52:05.304  INFO 11832 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.69]
2023-01-10 18:52:05.552  INFO 11832 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-01-10 18:52:05.553  INFO 11832 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2768 ms
2023-01-10 18:52:05.631  INFO 11832 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2023-01-10 18:52:05.956  INFO 11832 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2023-01-10 18:52:05.974  INFO 11832 --- [  restartedMain] o.s.b.a.h2.H2ConsoleAutoConfiguration    : H2 console available at '/h2-console'. Database available at 'jdbc:h2:mem:afd07beb-5972-4036-80cb-ba1690b1d740'
2023-01-10 18:52:06.180  INFO 11832 --- [  restartedMain] c.v.f.s.VaadinServletContextInitializer  : Search for VaadinAppShell took 30 ms
2023-01-10 18:52:07.938  INFO 11832 --- [  restartedMain] c.v.f.s.VaadinServletContextInitializer  : Search for subclasses and classes with annotations took 1637 ms
2023-01-10 18:52:07.960 ERROR 11832 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Exception sending context initialized event to listener instance of class [com.vaadin.flow.spring.VaadinServletContextInitializer$CompositeServletContextListener]

java.lang.RuntimeException: Unable to initialize com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener
    at com.vaadin.flow.spring.VaadinServletContextInitializer$FailFastServletContextListener.contextInitialized(VaadinServletContextInitializer.java:192) ~[vaadin-spring-23.3.1.jar:na]
    at com.vaadin.flow.spring.VaadinServletContextInitializer$CompositeServletContextListener.lambda$contextInitialized$0(VaadinServletContextInitializer.java:214) ~[vaadin-spring-23.3.1.jar:na]
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) ~[na:na]
    at com.vaadin.flow.spring.VaadinServletContextInitializer$CompositeServletContextListener.contextInitialized(VaadinServletContextInitializer.java:214) ~[vaadin-spring-23.3.1.jar:na]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4762) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5222) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1393) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1383) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:835) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1393) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1383) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:265) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:430) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:479) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:211) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:184) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.24.jar:5.3.24]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) ~[spring-boot-2.7.6.jar:2.7.6]
    at com.example.application.Application.main(Application.java:26) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.7.6.jar:2.7.6]
Caused by: java.lang.IllegalStateException: Failed to determine project directory for dev mode. Directory 'C:\Users\Downloads\flow-crm-tutorial' does not look like a Maven or Gradle project. Ensure that you have run the prepare-frontend Maven goal, which generates 'flow-build-info.json', prior to deploying your application
    at com.vaadin.base.devserver.startup.DevModeInitializer.getBaseDirectoryFallback(DevModeInitializer.java:404) ~[vaadin-dev-server-23.3.1.jar:na]
    at com.vaadin.base.devserver.startup.DevModeInitializer.initDevModeHandler(DevModeInitializer.java:216) ~[vaadin-dev-server-23.3.1.jar:na]
    at com.vaadin.base.devserver.DevModeHandlerManagerImpl.initDevModeHandler(DevModeHandlerManagerImpl.java:81) ~[vaadin-dev-server-23.3.1.jar:na]
    at com.vaadin.flow.spring.VaadinServletContextInitializer$DevModeServletContextListener.failFastContextInitialized(VaadinServletContextInitializer.java:475) ~[vaadin-spring-23.3.1.jar:na]
    at com.vaadin.flow.spring.VaadinServletContextInitializer$FailFastServletContextListener.contextInitialized(VaadinServletContextInitializer.java:188) ~[vaadin-spring-23.3.1.jar:na]
    ... 46 common frames omitted

2023-01-10 18:52:07.961 ERROR 11832 --- [  restartedMain] o.apache.catalina.core.StandardContext   : One or more listeners failed to start. Full details will be found in the appropriate container log file
2023-01-10 18:52:07.962 ERROR 11832 --- [  restartedMain] o.apache.catalina.core.StandardContext   : Context [] startup failed due to previous errors
2023-01-10 18:52:07.976  INFO 11832 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2023-01-10 18:52:07.980  WARN 11832 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
2023-01-10 18:52:07.981  INFO 11832 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2023-01-10 18:52:07.985  INFO 11832 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
2023-01-10 18:52:07.999  INFO 11832 --- [  restartedMain] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-01-10 18:52:08.037 ERROR 11832 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:165) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577) ~[spring-context-5.3.24.jar:5.3.24]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1303) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1292) ~[spring-boot-2.7.6.jar:2.7.6]
    at com.example.application.Application.main(Application.java:26) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.7.6.jar:2.7.6]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:142) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:479) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:211) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:184) ~[spring-boot-2.7.6.jar:2.7.6]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:162) ~[spring-boot-2.7.6.jar:2.7.6]
    ... 13 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1076) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:447) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123) ~[spring-boot-2.7.6.jar:2.7.6]
    ... 18 common frames omitted
Caused by: java.net.BindException: Address already in use: bind
    at java.base/sun.nio.ch.Net.bind0(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.bind(Net.java:459) ~[na:na]
    at java.base/sun.nio.ch.Net.bind(Net.java:448) ~[na:na]
    at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:227) ~[na:na]
    at org.apache.tomcat.util.net.NioEndpoint.initServerSocket(NioEndpoint.java:275) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:230) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1227) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1313) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:615) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1073) ~[tomcat-embed-core-9.0.69.jar:9.0.69]
    ... 25 common frames omitted


Process finished with exit code 0

I am trying to make UI using Vaadin framework which will connect to kafka cluster and can produce and consume messages through the UI. It was working good and I was able to achieve the goal too but all of a sudden while running again, I am getting the error.

Answer 1

The exception says: Address already in use: bind

This means there is already something running on port 8080.

If that's true you have to stop it. If this is a service you need you can change the port in the application.properties

server.port=8081