3 Ways To Modify Embedded Tomcat Server Port Inwards Jump Kicking Application

If you lot know Spring Boot actually simplifies the spider web evolution yesteryear embedding essential libraries every bit good every bit a tomcat server to run Java spider web application. By default, this tomcat server listens on port 4588 in addition to yesteryear whatever argue if you lot desire to alter than Spring kicking provides several configuration options to accomplish that. For example, I wanted tomcat to psyche on port 8080 because port fourscore is forwarded to 8080 inwards our Linux machine in addition to nosotros wanted our clients to render our customer amongst a create clean URL without a port.

Since yesteryear default HTTP asking goes to port fourscore in addition to if you lot accept forwarded that asking to 8080 in addition to if your Spring Boot application is listening on that port hence you lot tin access it amongst port similar http://localhost:8080/myspringbootapp or without port similar http://localhost/myspringbootapp.


If you lot also ask to alter the port of embedded Tomcat inwards Spring Boot application hence you lot accept come upwards to the correct place. In this article, I'll demo you lot iii ways to brand your restrain kicking application psyche on a specified port.

Btw, if you lot are novel to Spring Boot hence I also propose you lot bring together a comprehensive class like Learn Spring Boot inwards 100 Steps on Udemy to acquire inwards a to a greater extent than structured way. Spring kicking is 1 of the frameworks you lot should acquire inwards 2019 in addition to coming years, non only to develop awesome application but also to remain ahead amongst competition.

1. Changing Spring Boot Port inwards Tomcat using VM options

This is my favorite means to alter the port of embedded tomcat inwards Spring kicking application, only foremost your JVM amongst -Dserver.port=8080 or --server.port=8080 in addition to it volition psyche on that port.

If you lot are running Spring kicking application every bit an executable jar, hence you lot tin run your application using coffee -jar in addition to render the JVM arguments -Dserver.port=8080 every bit shown inwards the next example:

$ coffee -jar -Dserver.port=8080 myspringbootapp.jar


If you lot are using Eclipse to run the Spring kicking application, hence you lot tin also croak Run -> Run Configurations in addition to hence Arguments tab. Here you lot tin set the VM arguments -Dserver.port=8080 every bit shown below:

2. Changing Spring Boot Port inwards Embedded Tomcat using Properties

Another means to alter the port of embedded tomcat inwards Spring Boot application is yesteryear specifying the server.port property inwards the resources file. For example, if you lot desire your Spring kicking application to psyche on port 8080 hence you lot tin specify server.port=8080 on the application.properties inwards /src/main/resources/ folder.

$ truthful cat application.properties
server.port = 8080

If you lot desire to role random port i.e. every fourth dimension your Spring kicking application starts it uses a novel port, you lot tin laid server.port=0, this is skillful if you lot don't attention close port but non advised inwards whatever environs other than your local dev environs because it tin crusade port clashing.

Also, when you lot role the random port you lot tin acquire the port information yesteryear using the @Value annotation every bit shown below:

@Value("${local.server.port}")

If you lot already accept a duo of properties for your Spring Boot application hence this is the preferred means to alter the port of embedded tomcat server inwards Spring boot.

3. Changing Spring Boot Tomcat Port Programmatically

If you lot are a purist who likes to create everything inwards Java yesteryear writing code hence this method is for you. It allows you lot to specify the tomcat port for a Spring kicking application inwards code:

@Configuration public class ServletConfig { @Bean public EmbeddedServletContainerCustomizer containerCustomizer() {    return (container -> {      container.setPort(8080);     });   } }

Though beware, if you lot ask to alter the port 1 time to a greater extent than hence you lot ask to compile in addition to rebuild the project. That's why it's ameliorate to set whatever setting on JVM declaration or belongings file. If you lot role those methods you lot tin alter the tomcat port of Spring kicking application without recompiling in addition to rebuilding them.


That's all close how to alter the port of embedded tomcat server inwards Spring Boot application. As I said, yesteryear default Spring kicking application server listens on port 4588 but you lot tin alter the port yesteryear using these methods to croak far psyche on to a greater extent than familiar port 8080 or whatever other port of your choice. I by in addition to large prefer the VM alternative but if you lot similar properties file, experience gratuitous to role it. The programmatic means is really rare in addition to alone for purists.

Further Learning
Learn Spring Boot
Master Java Web Services amongst Spring Boot
Master Hibernate in addition to JPA amongst Spring Boot inwards 100 Steps


Other Java in addition to Spring articles you lot may like
v Spring Boot Features Every Java Developer Should Know (features)
Top v Free Courses to acquire Spring in addition to Spring Boot inwards 2019 (courses)
v Course to Master Spring Boot online inwards 2019 (courses)
10 Things Java Developer should acquire inwards 2019 (goals)
10 Tools Java Developers role inwards their day-to-day life (tools)
10 Tips to croak a ameliorate Java developer inwards 2019 (tips)
3 Best Practices Java Programmers tin acquire from Spring (best practices)
v courses to acquire Spring Boot in addition to Spring Cloud inwards 2019( courses)
v Spring Boot Annotations Java developer should acquire (annotations)
v Spring Books Java developers should read inwards 2019 (books)

Thanks for reading this article hence far. If you lot honour this Spring Boot tutorial in addition to tips useful hence delight percentage amongst your friends in addition to colleagues. If you lot accept whatever questions or feedback hence delight driblet a note.