Spring Boot: Change Port for Web Application

Question

I am currently trying to create a web application with Spring Boot. I need to host my application to localhost:8081. How do I change the port?

Answer 1

By default spring boot uses port 8080, BUT you can change the port just by adding the following code line in your main() like this:

System.getProperties().put( "server.port", *YOUR_PORT_NUMBER_GOES_HERE* );  

e.g

@SpringBootApplication
public class MyClass {
public static void main(String[] args) {
    System.getProperties().put( "server.port", 8181 );  //8181 port is set here
    SpringApplication.run(MyClass.class, args);
}

OR

You can configure it in your application.properties file like so:

server.port=8181

If you DON'T have an application.properties file in your spring-boot application, you can go ahead and create one. Right-click on the src/java/resources folder and go to New-> Other-> General and choose 'File' then name as: application.properties

Any other configurations you might need are listed here https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html. These properties are also configured in the application.properties file.

Answer 2

If you are using the embedded tomcat server, you can configure the EmbeddedServletContainerFactory bean yourself in your Application class annotated with @SpringBootApplication.

This will give you options to customize your tomcat server, example configuration

@Bean
public EmbeddedServletContainerFactory servletContainer() {
    TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
    factory.setPort(9000);
    factory.setSessionTimeout(10, TimeUnit.MINUTES);
    factory.addErrorPages(new ErrorPage(HttpStatus.NOT_FOUND, "/notfound.html"));
    return factory;
} 

You could also do the same for Jetty, using the JettyEmbeddedServletContainerFactory bean, or for Undertow using the UndertowEmbeddedServletContainerFactory .

Official documentation found here : http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/

Answer 3

In your application.properties file, just add one line

server.port = 8080

And for more configurations you can refer Spring Boot documentation on port

Answer 4

If you're using STS, you can do it following below steps:

• Go to Boot Dashboard view, you'll see your Boot app, say myApp1

• Right click and click on Open Config. This should open Run Time Configuration section.
• Go to Argument tab and add parameter server.port=, like in the example below, a custom port 9091 is added.

• Start the app and if everything is good, you'll see the desired port on Boot dashboard.

Answer 5

Actually you want to change server.port and you can change it in many different ways as described http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config

Examples:

• in your application.properties (in or outside the jar)

• command line

  java -Dserver.port=$PORT -jar target/demo-0.0.1-SNAPSHOT.jar

and much more

Answer 6

Actually you want to change server.port and you can change it in many different ways as described http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config

Put server.port=9000 in your application.properties