Java Uploader is a tool that comes packaged with Java. In order to fix the issues, I suggest you update the program to the latest version. Once the installation process is complete, your browser should identify it as a plugin and enable it by default. If not, you can enable from the following locations:
Mozilla Firefox: Click Tools and then Add-ons;
Internet Explorer: Click Tools and then Manage Add-ons;
Google Chrome: Type chrome://plugins/ in the address bar.