The UnsupportedCharsetException is probably not the problem. It happens also on systems where SNAP is working. Also, the Java version should not be an issue because SNAP brings its own Java instance.
On which operating system do you run SNAP? Is it a VM?
Sometimes the 3D WorldWind View causes trouble. Maybe you need to update the driver of the graphics card or try to disable it. Please have a look at this post:
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