Problem Solution
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It takes a very long time for an application to load

Run JAT Applications locally for faster execution

In the process of loading, some large files have to be downloaded, which may create the impression that the application has crashed. It is recommended instead to download the applications to the local hard drive and run them locally.


  • Download
  • Extract the downloaded file
  • Within the extracted folders, navigate a web browser to jat/deploy/index.html
  • Click on the desired application

The applications listed here can be run directly from the Internet. They have been tested to work with

Java 7.

I don't have Java3D on my computer. Install Java3D. On Ubuntu, open the software center and search for Java3D.
I try run a Jat3D application. It does not run at all or I get a security warning. Java's security policy does not allow a browser to use native libraries (such has the 3D graphics library) unless explicitly permitted. On Ubuntu Linux, this is accomplished by creating a security policy file named ".java.policy" or "java.policy" in your home directory. For simplicity, you could grant Java all permissions to test the software, but you should not leave this in place as it could compromise the security of your system. Example:

Contents of file /home/jatuser/.java.policy

grant {

You will have to close all open browser windows and restart the web browser to enact the policy change.

I try run a Jat3D application. It does not run at all or I get the error: java.lang.UnsatisfiedLinkError: no j3dcore-ogl in java.library.path The library may not be in the library path of the web browser.
Copy the library into the /lib folder. Open a terminal and run

sudo cp /usr/lib/jni/ /lib/

Then, restart the browser.

I run a Jat3D application and when I try to run another Jat3D application,
I get the error:
java.lang.UnsatisfiedLinkError: Native Library /lib/ already loaded in another classloader
Close the web browser and restart it. Reload index.html and the application.