3 Ways To Modify Embedded Tomcat Server Port Inwards Leap Kick Application

If y'all know Spring Boot actually simplifies the spider web evolution past times 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 too past times whatever argue if y'all desire to alter than Spring boot provides several configuration options to laissez passer on that. For example, I wanted tomcat to heed on port 8080 because port eighty is forwarded to 8080 inwards our Linux machine too nosotros wanted our clients to furnish our customer amongst a create clean URL without a port.

Since past times default HTTP asking goes to port eighty too if y'all accept forwarded that asking to 8080 too if your Spring Boot application is listening on that port too then y'all tin post away access it amongst port similar http://localhost:8080/myspringbootapp or without port similar http://localhost/myspringbootapp.


If y'all also require to alter the port of embedded Tomcat inwards Spring Boot application too then y'all accept come upward to the correct place. In this article, I'll exhibit y'all 3 ways to brand your boundary boot application heed on a specified port.

Btw, if y'all are novel to Spring Boot too then I also propose y'all bring together a comprehensive class like Learn Spring Boot inwards 100 Steps on Udemy to larn inwards a to a greater extent than structured way. Spring boot is 1 of the frameworks y'all should larn inwards 2019 too coming years, non only to educate awesome application but also to rest ahead amongst competition.

1. Changing Spring Boot Port inwards Tomcat using VM options

This is my favorite agency to alter the port of embedded tomcat inwards Spring boot application, only kickoff your JVM amongst -Dserver.port=8080 or --server.port=8080 too it volition heed on that port.

If y'all are running Spring boot application every bit an executable jar, too then y'all tin post away run your application using coffee -jar too furnish the JVM arguments -Dserver.port=8080 every bit shown inwards the next example:

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


If y'all are using Eclipse to run the Spring boot application, too then y'all tin post away also survive out Run -> Run Configurations too and then Arguments tab. Here y'all tin post away set the VM arguments -Dserver.port=8080 every bit shown below:

2. Changing Spring Boot Port inwards Embedded Tomcat using Properties

Another agency to alter the port of embedded tomcat inwards Spring Boot application is past times specifying the server.port property inwards the resources file. For example, if y'all desire your Spring boot application to heed on port 8080 too then y'all tin post away specify server.port=8080 on the application.properties inwards /src/main/resources/ folder.

$ truthful cat application.properties
server.port = 8080

If y'all desire to role random port i.e. every fourth dimension your Spring boot application starts it uses a novel port, y'all tin post away laid server.port=0, this is practiced if y'all don't attention virtually port but non advised inwards whatever surroundings other than your local dev surroundings because it tin post away drive port clashing.

Also, when y'all role the random port y'all tin post away acquire the port information past times using the @Value annotation every bit shown below:

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

If y'all already accept a duo of properties for your Spring Boot application too then this is the preferred agency to alter the port of embedded tomcat server inwards Spring boot.

3. Changing Spring Boot Tomcat Port Programmatically

If y'all are a purist who likes to create everything inwards Java past times writing code too then this method is for you. It allows y'all to specify the tomcat port for a Spring boot application inwards code:

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

Though beware, if y'all require to alter the port over again too then y'all require to compile too rebuild the project. That's why it's ameliorate to set whatever setting on JVM declaration or belongings file. If y'all role those methods y'all tin post away alter the tomcat port of Spring boot application without recompiling too rebuilding them.


That's all virtually how to alter the port of embedded tomcat server inwards Spring Boot application. As I said, past times default Spring boot application server listens on port 4588 but y'all tin post away alter the port past times using these methods to acquire inwards heed on to a greater extent than familiar port 8080 or whatever other port of your choice. I by too large prefer the VM alternative but if y'all similar properties file, experience gratis to role it. The programmatic agency is really rare too exclusively for purists.

Further Learning
Learn Spring Boot
Master Java Web Services amongst Spring Boot
Master Hibernate too JPA amongst Spring Boot inwards 100 Steps


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Thanks for reading this article hence far. If y'all uncovering this Spring Boot tutorial too tips useful too then delight portion amongst your friends too colleagues. If y'all accept whatever questions or feedback too then delight drib a note.

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