why cannot extract spring boot executable jar : <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>
