simtk.org

Hi, I tried to install a new version of OpenSim 1.1, but it doesn't work. There is an error message about "A java.lang.NoClassDefFoundError exception has occurred.". How can I do? Thanks. Carrie

Dear Carrie,

Please report any prior installations of OpenSim on the machine you're installing OpenSim on. In general you should:
1. Uninstall previous versions of OpenSim (using
All Programs -> OpenSim 1.0 -> Uninstall)
2. Make sure you select the radio button to
"Add OpenSim to the system PATH for all users".

If you didn't have old installations then it's very likely item 2. You just need to reinstall the package from the downloaded executable, and select the radio button as described above when installing.

-Ayman

I have the same problem

So, did you try the solution I proposed earlier?

I've seen a case where the installer didn't end up adding the OpenSim installation directory to the PATH because of a user PATH that was very long, or had some unusual characters.

You can always check if it's a path problem by openning a command prompt window (using Start->run->cmd) and then type "scale" for example which is one of the executables we distribute. If it can't be found then it's obviously a path issue.

You also need to make sure you invoke the application from the start-menu, otherwise the executable may not be invoked with correct environment.

-Ayman