An internal error occurred during: “contacting software sites”. java.lang.nullpointerexception

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  <pre>
    <code>
      &lt;!DOCTYPE html&gt;
      &lt;html&gt;
        &lt;head&gt;
          &lt;title&gt;Internal Server Error&lt;/title&gt;
        &lt;/head&gt;
        &lt;body&gt;
          There was an internal error.
          &lt;h1&gt;An Internal Error Occurred&lt;/h1&gt;
          &lt;p&gt;During: "Contacting Software Sites"&lt;/p&gt;
          &lt;p&gt;java.lang.NullPointerException&lt;/p&gt;
          &lt;p&gt;Explanation:&lt;/p&gt;
          &lt;p&gt;The error message indicates that a NullPointerException occurred while trying to contact software sites.&lt;/p&gt;
          &lt;p&gt;A NullPointerException is thrown when code attempts to use an object reference that has a null value.&lt;/p&gt;
          &lt;h2&gt;Example&lt;/h2&gt;
          &lt;pre&gt;
            &lt;code&gt;
              public class SoftwareSite {
                public void contactSites() {
                  String site = null;
                  System.out.println(site.length());
                }
              }
              
              public class Main {
                public static void main(String[] args) {
                  SoftwareSite softwareSite = new SoftwareSite();
                  softwareSite.contactSites();
                }
              }
            &lt;/code&gt;
          &lt;/pre&gt;
          &lt;p&gt;In this example, the contactSites() method tries to access the length of a null string, which throws a NullPointerException.&lt;/p&gt;
        &lt;/body&gt;
      &lt;/html&gt;
    </code>
  </pre>
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