SpringBoot - Unable to start embedded container

Question

My SpringBootLoginController class throw this error( unable to start embedded container) which is shown below when i have started the springboot application.It is a hello world kind spring boot application example.

   .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
    ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::        (v1.5.2.RELEASE)

org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean.
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:536) ~[spring-context-4.3.7.RELEASE.jar:4.3.7.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.2.RELEASE.jar:1.5.2.RELEASE]

My pom.xml

<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.test.springboot</groupId>
    <artifactId>HelloSpringBoot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>HelloSpringBoot</name>
    <description>HelloSpringBoot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

My Controller :

import org.springframework.boot.*;
import org.springframework.web.bind.annotation.*;

@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootLoginController.class, args);
    }

}

Answer 1

Annotating with the @SpringBootApplication resolves this issue.

@SpringBootApplication
@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootLoginController.class, args);
    }
}

Alternatively , by Adding the @EnableAutoConfiguration also resolves this issue.

@EnableAutoConfiguration
@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootLoginController.class, args);
    }
}

Answer 2

Try annotating your SpringBootLoginController class with @SpringBootApplication annotation.

@SpringBootApplication
@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootLoginController.class, args);
    }
}

Answer 3

For my case, I was developing a command line project with springboot.

@SpringBootApplication
public class Application implements CommandLineRunner {
//my code here
}

So I was just using the simple starter.

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

But I also got this error, and there was no web related dependency in my pom which was really wired.

And at last I found out that one of my dependency project was using the "javax.servlet.Servlet" in its own pom.

If you check the source code of the springboot, it will check if there is any "javax.servlet.Servlet" in your project when starting the application. And try to start a web "embedded container" when there is any "javax.servlet.Servlet".

That's why I got this error because I was using the "spring-boot-starter" and there was no web container in it.

So the solution is very simple, just tell the springboot that this is not a web project in the "application.properties":

spring.main.web-environment=false

Answer 4

I deleted my .m2 repo, changed my version from 1.3.1 to 2.1.3 for the below, did a maven clean, re-build the project and it ran first time (using intellij)

parent>
   <groupId>org.springframework.boot</groupId>
   <version>2.1.3.RELEASE</version>
   <artifactId>spring-boot-starter-parent</artifactId>
</parent>

Answer 5

Change the version of the org.springframework.boot to 2.1.3 from 1.4.2

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>

Answer 6

in my case adding

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
</dependency>

solved issue

Answer 7

You should annotate your SpringBootLoginController class. Read about @SpringBootApplication annotation.

@SpringBootApplication
@RestController
public class SpringBootLoginController {

    @RequestMapping("/hello")
    String hello() {
        return "Hello World!!!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(SpringBootLoginController.class, args);
    }
}

Answer 8

If you are using maven then build by

mvn package

instead of IDE build jar.

There are many problems with the IDE built jar in my case.

Answer 9

直到现在我还没有弄清楚这个问题，但我删除了我的 .m2 存储库，提供了安装版本，一切都像魅力一样工作

Answer 10

you have a problem on your dependencies. Add this

<dependency>
<groupId><groupId></groupId>
<artifactId><some dependency></artifactId>
<version><version></version>
<exclusions>
    <exclusion>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
    </exclusion>
</exclusions>