title: graphql-java - How to use subscriptions with spring boot?
body: <p>In a project I use <strong><a href="https://github.com/graphql-java/graphql-java" rel="noreferrer">graphql-java</a></strong> and <strong><em>spring boot</em></strong> with a postgreSQL Database. Now I would like to use the <strong><a href="https://graphql-java.readthedocs.io/en/latest/schema.html#subscription-support" rel="noreferrer">subscription feature</a></strong> published in version 3.0.0. Unfortunately, the information about the application of the subsciption function is not very mature. </p>
  
  <p>How is the approach to achieve <strong>real-time functionality</strong> using <code>graphql-java</code> with subscriptions?</p>