Browser says Java not installed when it is?

When I try to use a Java app, my browser says Java is not installed, though Minecraft is working just fine and I double checked just in case and Java IS installed. I tried making sure JavaScript is enabled in Chrome, and it is. How can I fix this?

I don't know

Upgrade all your browsers. And try to install this https://www.java.com/en/download/manual.jsp

Go to the browsers website