We will start with available servers and then change the embedded server to undertow and then configure the server specific properties.
Spring Boot supports Tomcat, Undetow and Jetty as embedded servers. Now, we will change and/ or configure the default embedded server and common properties to all the available servers.
In the previous post, we created a web application which uses Apache Tomcat as default embedded server. We will change it to undertow.
Spring Boot provides convenient way of configuring dependencies with its starters. For changing the embedded server, we will user its spring-boot-starter-undertow.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-undertow</artifactId>
</dependency>spring-boot-starter-web comes with Embedded Apache Tomcat. We need to exclude this dependency.
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>This is all we need to do to change the embedded server.
There are some generic properties which is applicable for every server and some server specific properties that we can tweak to improve the preformance. Let's change some of the server properties.
server.port property is used for configuring the port on our Spring Boot application should run.
You can enable to compression on response sent by server and can tweak the mimeTypes, minResponseSize for compression. By default, the compression is disabled. Default property value for mimeTypes is text/html, text/xml, text/plain, text/css, text/javascript,application/javascript. Default property value for minResponseSize is 2048 bytes.
You can also enable ssl, modify maxHttpPostSize, contextParameters, contextPath and other server related properties. To know more, see org.springframework.boot.autoconfigure.web.ServerProperties class.
You can also change embedded server specific properties. In our example, we have changed embedded server to Undertow and have tweaked its ioThreads and workerThreads properties.
A sample properties file which have above mentioned properties changes.
server:
port: 8082
undertow:
ioThreads: 15
workerThreads: 150
accesslog:
enabled: true
compression:
enabled: true
mimeTypes: text/xml, text/css, text/html, application/json
minResponseSize: 4096
spring:
application:
name: gauravdotcc-embedded-server-exampleI hope this post is informative and helpful. You can see the full example code on Github.