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Application blocked by Java security error: Quick Fix

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Java is one of the most popular computer languages to have ever been released. Hundreds of millions of devices use Java to run applications, including our computers. However, as universal as it might be, running Java applications doesn’t always go as smoothly as intended. 

In this article, we’re taking a look at the “application blocked by Java security” error message, its causes and what you can do to fix the problem. 

What causes this error?

Starting with the Java 7 Update 51, the language has enhanced security to make the user system less vulnerable to external exploits, meaning that unsigned programs, self-signed programs or programs with missing permission attributes aren’t allowed to run anymore. 

This is great for a number of reasons as the language will block out any applications that might be trying to exploit your system since they will almost never have proper signing or permission attributes.

Also read: How to fix “Error: could not find or load main class” in Java?

How to fix this?

Here are a couple of simple solutions that you can try out to fix the application blocked by Java security error.

Update the program

In most cases, if you’re using the development or beta build of a product, the developer will at some point update it with the required permissions and signing attributes. Check to see if there are any updates available and if there are, update your program immediately before trying again. 

What's the difference between Java and Javascript?

Add the program to the Java exception list

Adding the program to the exception list will allow Java to ignore any signing or permission issues and run it directly. 

Step 1: Head over to the Control Panel and click the Java icon.

Step 2: Head over to the Security tab and click Edit Site List.

Step 3: Click the Add button under Exception Site List.

Step 4: Click the empty field under Location and type the full URL. Make sure you include any prefixes such as HTTP:// or HTTPS://. 

Step 5: Click the OK button and you’re good to go. 

Let us know if you’re still facing the application blocked by Java security error and any other measures you found useful to solve the issue.

Also read: What is Android System Webview? Everything you need to know


Yadullah Abidi

Yadullah is a Computer Science graduate who writes/edits/shoots/codes all things cybersecurity, gaming, and tech hardware. When he's not, he streams himself racing virtual cars. He's been writing and reporting on tech and cybersecurity with websites like Candid.Technology and MakeUseOf since 2018. You can contact him here: