title: No output with jdeps when using -jdkinternals
body: <p>I am trying to use the <a href="https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool" rel="nofollow">Java Dependency Analysis Tool (jdeps)</a>. First I tried to do it with no arguments like so:</p>
  
  <pre><code>jdeps myJar.jar
  </code></pre>
  
  <p>It lists the dependencies that it uses. So far so good.</p>
  
  <pre><code>org.example (myJar.jar)
     -&gt; java.io
     -&gt; java.lang
     -&gt; java.text
     -&gt; java.util
     [...]
  </code></pre>
  
  <p>However, the biggest reason to use <code>jdeps</code> is to detect dependencies on packages that will not be accessible in Java 9 (e.g. <code>sun.*</code> packages). So I try to use the <code>-jdkinternals</code> flag, which checks for these incompatibilities. Thus my command is:</p>
  
  <pre><code>jdeps -jdkinternals myJar.jar
  </code></pre>
  
  <p>However, there is no output when I run this. Does this mean that it failed to run? What am I missing?</p>