If you use the service, you’ll notice that the logs have lots of entries with the message Fetching boot metadata from spring.io/project_metadata/spring-boot. To avoid checking for the latest Spring Boot versions too often, you should enable caching on your service. Spring Initializr has some auto-configuration to apply the proper caches if you are willing to use a JCache (JSR-107) implementation.

Add the javax.cache:cache-api and your favorite JCache implementation and simply enable caching by adding @EnableCaching to your @SpringBootApplication. For instance, you could use ehcache by adding the following:

<dependency>
    <groupId>javax.cache</groupId>
    <artifactId>cache-api</artifactId>
</dependency>
<dependency>
    <groupId>org.ehcache</groupId>
    <artifactId>ehcache</artifactId>
</dependency>

Or if you are using Gradle:

compile("javax.cache:cache-api")
compile("org.ehcache:ehcache")

You’ll notice that the log entry is much more rare. If you do not want to use JSR-107, you should configure the cache yourselves. Here are the caches used by the application (each one will require some configuration to get it working):