These 3 look good
CL-USER(2): (jclass-of (jfield "java.lang.System" "out")) "java.io.PrintStream" "java.io.PrintStream"
CL-USER(4): (jclass-of 1) NIL NIL
CL-USER(5): (jclass-of (make-immediate-object 1)) "java.lang.Integer" "java.lang.Integer"
But is this correct?
CL-USER(17): (jclass-of (jfield "java.lang.Boolean" "TRUE")) NIL NIL CL-USER(18): (jclass-of (jfield "java.lang.Boolean" "FALSE")) NIL NIL