How to pass variable to lua script from java? ( io.lettuce.core )

I have a lua script like this that does an hgetall command on a remote redis cluster:

String shaFindAccount = syncCommands.scriptLoad("local hgetAllKeys = function(key) \n"+"local acc = redis.call('HGETALL', key)\n"+"return acc\n"+"end\n");

I want to pass a variable to the hgetall call. This is what my eval statement, calling the above script, looks like:

list = syncCommands.evalsha(shaFindAccount, ScriptOutputType.MULTI, key);

Where key is a unique identifier (primary key) of acc. Right now this function returns an empty list.

How do I pass a java variable into the above lua script with io.lettuce.core? (There are no connection issues, i can use a similar query with a hardcoded key value and it works)