about spring boot how to disable web environment correctly

Question

Spring boot non-web application, when start it has below error

Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWe         


        

Answer 1

This answer is obsolete. Please note the other answer for Spring Boot 2.0

Original answer for Spring Boot 1.x:

The reason this config is not working because these are two different instances:

new SpringApplication().setWebEnvironment(false); 
SpringApplication.run(SpringBootDisableWebEnvironmentApplication.class, args);

You are disabling setWebEnvironment(false) in new SpringApplication() object and calling static method run() on SpringApplication.run(...) which is different one.

I figured out 3 ways to do this:

@SpringBootApplication
public class SpringBootDisableWebEnvironmentApplication implements CommandLineRunner{


    public static void main(String[] args) throws Exception {

//      Method#1: Using SpringApplicationBuilder.

        SpringApplication springApplication = 
                new SpringApplicationBuilder()
                .sources(SpringBootDisableWebEnvironmentApplication.class)
                .web(false)
                .build();

        springApplication.run(args);

//--------------------------------------------------------      

//      Method#2: Using SpringBootDisableWebEnvironmentApplication.     

//      SpringBootDisableWebEnvironmentApplication springBootDisableWebEnvironmentApplication = 
//              new SpringBootDisableWebEnvironmentApplication();
//      springBootDisableWebEnvironmentApplication.run(args);

//--------------------------------------------------------      

//      Method#3: Using SpringApplication().

//      SpringApplication springApplication = new SpringApplication();
//      springApplication.setWebEnvironment(false);
//      
//      Set<Object> sources = new HashSet<>();
//      sources.add(SpringBootDisableWebEnvironmentApplication.class);
//      springApplication.setSources(sources);
//      springApplication.run(args);

//--------------------------------------------------------  

    }

    @Override
    public void run(String... arg0) throws Exception {
        System.out.println("Hello, Spring Boot gives many options ;)");
    }
}

Here is the complete working Project.

And you don't need to exclude below config:

@SpringBootApplication(exclude = {EmbeddedServletContainerAutoConfiguration.class, 
                              WebMvcAutoConfiguration.class})

Because you don't have spring-boot-starter-web dependency in your pom.xml

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

Answer 2

Starting from Spring Boot 2.0

-web(false)/setWebEnvironment(false) is deprecated and instead Web-Application-Type can be used to specify

• Application Properties

  spring.main.web-application-type=NONE 
  # REACTIVE, SERVLET
  

• or SpringApplicationBuilder

  @SpringBootApplication
  public class SpringBootDisableWebEnvironmentApplication {
  
      public static void main(String[] args) {
          new SpringApplicationBuilder(SpringBootDisableWebEnvironmentApplication.class)
              .web(WebApplicationType.NONE) // .REACTIVE, .SERVLET
              .run(args);
     }
  }
  

---

Where WebApplicationType:

• NONE - The application should not run as a web application and should not start an embedded web server.
• REACTIVE - The application should run as a reactive web application and should start an embedded reactive web server.
• SERVLET - The application should run as a servlet-based web application and should start an embedded servlet web server.

Courtesy: Another SO Answer