title: IntelliJ says the package does not exist, But I can access the package
body: <p>I get the error below, but I can find the package in rt.jar.
  I can see the JDK being used from Project Structure.
  I'm not sure what's missing.</p>
  
  <pre><code>Error:(6, -1) Play 2 Compiler: 
   C:\user\projects\portal\app\com\example\security\cert\X509Cert.java:6: package sun.security.pkcs10 does not exist
   import sun.security.pkcs10.*;
   C:\user\projects\portal\app\com\v\security\cert\GenerateCSR.java:75: cannot find symbol
  </code></pre>