You can run the jar from from the current library and point to your desired jre library by the following:
.\jre6\bin\java.exe -jar DesktopApplication1.jar
Running and Deploying Jar Files
Refer: article

Technical notes, and other ideas.
You can run the jar from from the current library and point to your desired jre library by the following:
.\jre6\bin\java.exe -jar DesktopApplication1.jar
Running and Deploying Jar Files
Refer: article