title: Why can't I extract a spring boot executable jar?
body: <p>spring boot project, build as a executable jar, but I found cannot extract the executable jar, e.g.</p>
  
  <pre><code>jar xvf spring-boot-foo-0.0.1-SNAPSHOT.jar
  </code></pre>
  
  <p>nothing output.
  But when extract a normal jar, it is successful</p>
  
  <pre><code>jar xvf mysql-connector-java-5.1.38.jar
  created: META-INF/
  inflated: META-INF/MANIFEST.MF
  created: META-INF/services/
  ...
  </code></pre>
  
  <p>why is this?</p>