From what I can see at www.openlaszlo.org it requires a Java servlet container. These are generally not permitted on DH shared servers.
If you REALLY want to try it, you could ask DH Support but I’m pretty sure that you’ll get at least one of two answers - maybe both.
“We don’t support it.”
“Don’t even try it.”
from the wiki we see that persistent processes (which a servlet container would be) are frowned upon.