Spring boot Unable to start embedded Tomcat servlet container

Question

I m new to Spring Boot and having with error while running my application  I m following a tutorial and I believe I m having proper parent and dependencies with POM  please help me   main class   package com boot  import org springframework boot SpringApplication  import org springframework boot autoconfigure EnableAutoConfiguration  import org springframework boot autoconfigure SpringBootApplication  import org springframework context annotation ComponentScan  import org springframework context annotation Configuration          Hello world           SpringBootApplication public class App        public static void main  String   args                 SpringApplication run App class   hello              error is      org springframework boot context embedded EmbeddedServletContainerException  Unable to start embedded Tomcat servlet container         at org springframework boot context embedded tomcat TomcatEmbeddedServletContainer start TomcatEmbeddedServletContainer java 165    spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot context embedded EmbeddedWebApplicationContext startEmbeddedServletContainer EmbeddedWebApplicationContext java 293    spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot context embedded EmbeddedWebApplicationContext finishRefresh EmbeddedWebApplicationContext java 141    spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework context support AbstractApplicationContext refresh AbstractApplicationContext java 541    spring-context-4 2 4 RELEASE jar 4 2 4 RELEASE          at org springframework boot context embedded EmbeddedWebApplicationContext refresh EmbeddedWebApplicationContext java 118    spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot SpringApplication refresh SpringApplication java 764   spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot SpringApplication doRun SpringApplication java 357   spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot SpringApplication run SpringApplication java 305   spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot SpringApplication run SpringApplication java 1124   spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at org springframework boot SpringApplication run SpringApplication java 1113   spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE          at com boot App main App java 18   classes  na Caused by  java lang IllegalStateException  Tomcat connector in failed state         at org springframework boot context embedded tomcat TomcatEmbeddedServletContainer start TomcatEmbeddedServletContainer java 159    spring-boot-1 3 1 RELEASE jar 1 3 1 RELEASE              10 common frames omitted   POM         lt project xmlns  http   maven apache org POM 4 0 0  xmlns xsi  http   www w3 org 2001 XMLSchema-instance        xsi schemaLocation  http   maven apache org POM 4 0 0 http   maven apache org xsd maven-4 0 0 xsd  gt         lt modelVersion gt 4 0 0 lt  modelVersion gt      lt groupId gt com boot lt  groupId gt     lt artifactId gt das-boot lt  artifactId gt     lt version gt 0 0 1-SNAPSHOT lt  version gt     lt packaging gt jar lt  packaging gt       lt parent gt           lt groupId gt org springframework boot lt  groupId gt           lt artifactId gt spring-boot-starter-parent lt  artifactId gt           lt version gt 1 3 1 RELEASE lt  version gt       lt  parent gt     lt name gt das-boot lt  name gt     lt url gt http   maven apache org lt  url gt      lt properties gt       lt project build sourceEncoding gt UTF-8 lt  project build sourceEncoding gt     lt  properties gt      lt dependencies gt     lt dependency gt     lt groupId gt org springframework boot lt  groupId gt     lt artifactId gt spring-boot-starter-web lt  artifactId gt     lt  dependency gt       lt dependency gt         lt groupId gt junit lt  groupId gt         lt artifactId gt junit lt  artifactId gt         lt version gt 3 8 1 lt  version gt         lt scope gt test lt  scope gt       lt  dependency gt     lt  dependencies gt   lt  project gt

User · Answer

This could happen due to the change in java version of the project Say for example if the project is build in java 8 and if we change the java version to 11 then there can be such issue  In intellij idea go to the File- gt Project Structure then change the Project SDK Version

User · Answer

Try to change the port number in application yaml  or application properties  to something else

User · Answer

You need to Tomcat Dependency and also extend your Application Class from extends SpringBootServletInitializer    SpringBootApplication   public class App extend SpringBootServletInitializer       public static void main  String   args                 SpringApplication run App class   hello

User · Answer

Simple way to handle this is to include this in your application properties or  yml file  server port 0 for application properties and server port  0 for application yml files  Of course need to be aware these may change depending on the springboot version you are using  These will allow your machine to dynamically allocate any free port available for use  To statically assign a port change the above to server port   someportnumber  If running unix based OS you may want to check for zombie activities on the port in question and if possible kill it using fuser -k  theport  tcp  Your  yml or  properties should look like this   server    port  8089   servlet      context-path   somecontextpath

User · Answer

For me  the problem was in XML migrations  I deleted all tables and sequences and it works on next bootRun

User · Answer

For me  I just had to put a -X flag with mvn  Look at the debug log  there was an issue with Spring while locating the  properties file

User · Answer

You need to add the tomcat dependency in your pom   lt dependency gt           lt groupId gt org springframework boot lt  groupId gt           lt artifactId gt spring-boot-starter-tomcat lt  artifactId gt   lt  dependency gt

User · Answer

If you are running on a linux environment  basically your app does not have rights for the default port  Try 8181 by giving the following option on VM  -Dserver port 8181

User · Answer

In my condition when I got an exception   Unable to start embedded Tomcat servlet container    I opened the debug mode of spring boot by adding debug true in the application properties   and then rerun the code  and it told me that java lang NoSuchMethodError  javax servlet ServletContext getVirtualServerName  Ljava lang String  Thus  we know that probably I m using a servlet API of lower version  and it conflicts with spring boot version   I went to my pom xml  and found one of my dependencies is using servlet2 5  and I excluded it   Now it works  Hope it helps

[java] Spring boot: Unable to start embedded Tomcat servlet container

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