I'm having difficulty passing a null pointer to an array as an argument to a C function. The Java declaration is:

void efm111_det_enty_rop_at_loca(FacilityTypeStructure fac_type, int in_rl_nbr, PropoStructure in_propo[], ShortByReference sop_count, ObjectPointAndOrientationStructure sop[]);

It works fine when I use an actual array as the third argument ( PropoStructure in_propo[]), but I need to be able to test the use case where the array pointer is null. More specifically, where the C code says

if (in_propo == (Propo_Struct *)NULL) {...}

I tried substituting a Java null as the third argument, but that causes a JVM crash. I didn't see anything in the forum that covers this exact scenario, but I'm guessing one of the JNA memory or pointer classes must be what I want. I just can't figure out how to do it.

Any ideas?