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 :

    <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">       <modelVersion>4.0.0</modelVersion>    <groupId>com.boot</groupId>   <artifactId>das-boot</artifactId>   <version>0.0.1-SNAPSHOT</version>   <packaging>jar</packaging>     <parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-parent</artifactId>         <version>1.3.1.RELEASE</version>     </parent>   <name>das-boot</name>   <url>http://maven.apache.org</url>    <properties>     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>   </properties>    <dependencies>   <dependency>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-web</artifactId>   </dependency>     <dependency>       <groupId>junit</groupId>       <artifactId>junit</artifactId>       <version>3.8.1</version>       <scope>test</scope>     </dependency>   </dependencies> </project> 

Answer 1

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

Answer 2

You need to add the tomcat dependency in your pom

<dependency>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-tomcat</artifactId> </dependency>