<p>When trying to upgrade Java, you might encounter the following error message:</p>
<p>Java install did not complete. Error Code: 1603.</p>
<p><img class="alignnone wp-image-5715" src="https://www.wincert.net/wp-content/uploads/2025/04/java-setup-1.png" alt="" width="573" height="307" /></p>
<p>The most probable cause of this error message is that you&#8217;re trying to update Java on the Server, but other users are logged in. To successfully update the Java installation, log off other server users.</p>
<p>Navigate to the <strong>task manager</strong> and log off other users from the Server in the Users tab.</p>
<p><img class="alignnone size-full wp-image-5718" src="https://www.wincert.net/wp-content/uploads/2025/04/java-setup-2.png" alt="" width="723" height="261" /></p>
<p>During the setup, you&#8217;ll be asked to remove the old Java version and install the new one. Even though the setup went fine and the Java folder with the latest version was created, I could not locate the Java shortcuts in the Start Menu, which at first look appears as if the installation did not complete successfully.</p>
<p><img class="alignnone wp-image-5717" src="https://www.wincert.net/wp-content/uploads/2025/04/java-setup-4.png" alt="" width="272" height="445" /></p>
<p>I&#8217;ve tried to run the frmservlet extension that opened with Java before the update, but this file extension was not registered to open with Java.</p>
<p><img class="alignnone wp-image-5716" src="https://www.wincert.net/wp-content/uploads/2025/04/java-setup-3.png" alt="" width="526" height="181" /></p>
<p>To solve this error, rerun the Java setup, and the installation will be completed successfully the second time. It appears that there&#8217;s a bug either in the Java installer or with the combination of the old Java version removal.</p>