CL-USER> (#"getMultiDimensional" 'Array)

#(#<jarray [I@2b8edf4d {30E64E92}> #<jarray [I@60306c52 {B17ACD4}> #<jarray [I@3f5397fc {91F41DF}> #<jarray [I@631d9c26 {2CF6B5A0}>)

CL-USER> (#0"getMultiDimensional" 'Array)

#<jarray [[I@4068f9fc {2BF4306D}>

or

(jstatic-raw "getMultiDimensional" (find-java-class "Array"))

#<jarray [[I@56810247 {2FBCAFAF}>

So try using #0"..." if you are using jss or jcall-raw if not.