Last updated: January 16, 2019
If you encounter a Java applet in your web browser, and see a window display that says Application Blocked by Security Settings, don’t fret. Your security settings have blocked an application from running with insecure or expired Java (JRE). It may be due to running an old version of Java on your computer. This alert displays to help protect your computer system from potential vulnerabilities that may exist in older versions of the plug-in. By blocking the application, it is not allowed to run in your web browser.
It is difficult to view Java content on modern systems and in modern browsers. For tips on viewing Java content on Windows 10, please refer to our Java support on Windows 10 article for the latest information. For up-to-date information on viewing Java content using Google Chrome (yes, it’s possible) — the internet’s most popular web browser — please see Java support in Google Chrome. macOS removed support for Java in Safari 12, but Mac users still have a few options too.
We recommend always running the latest version of Java on your computer. When Oracle releases a new version of the Java plug-in, the major web browsers may prevent certain plug-ins from launching if the plug-in version is old. The configuration of your Java Security Settings may also prevent applets from loading if your Java version is old. Please see How to update Java on your computer for more information.
Workaround
If you decide to run a blocked application, run it only if you understand the risk and implications. You may use the Exception Site List to run any blocked application. To do so, launch your computer’s Java Control Panel, and click the Security tab:
Next, click the Edit Site List button. A new Exception Site List window displays. Within the new Exception Site List window, click the Add button.
Finally, click in the empty field under the Location field. Enter the URL (the URL should start with http:// or https://, for example, https://www.domain.com). The domain name of the embedded applet’s codebase URL may differ from the domain name of the web page you are visiting. If so, add both domain names.
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