title: No session repository could be auto-configured, check your configuration (session store type is 'null')
body: <p>What does this spring boot start up error mean?</p>
  
  <pre><code>2016-07-04 21:53:53 [restartedMain] ERROR o.s.boot.SpringApplication - Application startup failed    org.springframework.beans.factory.BeanCreationException: Error creating bean with name org.springframework.boot.autoconfigure.session.SessionAutoConfiguration$SessionRepositoryValidator': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: No session repository could be auto-configured, check your configuration (session store type is 'null')
  </code></pre>