Add failing test to illustrate issue

libtest/struct/NumericStruct.c

@@ -55,3 +55,16 @@ GET_VAL(pointer);
 int struct_num_size() {
     return sizeof(NumericStruct);
 }
+
+long struct_num_al_test(FfiStrList s) {
+   return s.count;
+}
+/*
+This will work but I don't have access to the original code and I rather not create a wrapper in c
+int struct_num_al_test(FfiStrList *s) {
+   return struct_num_al_test_internal(*s);
+}
+
+int struct_num_al_test_internal(FfiStrList s) {
+   return s.count;
+}*/

libtest/struct/StructTypes.h

@@ -57,3 +57,12 @@ typedef union NestedUnion_t {
     NumericStruct *ptr_NumericStruct;
     NumericUnion *ptr_NumericUnion;
 } NestedUnion;
+
+typedef const char *FfiStr;
+
+typedef struct FfiList_FfiStr {
+  size_t count;
+} FfiList_FfiStr;
+
+typedef struct FfiList_FfiStr FfiStrList;
+

src/test/java/jnr/ffi/struct/NumericStructTest.java

@@ -43,6 +43,16 @@ public class NumericStructTest {
 
     public enum Enum {e0, e1, e2, e3}
 
+    public static class FfiStrList extends Struct {
+        //public final UTF8String count = new UTF8String(32); <-- works as per example
+        public final Struct.LONG count = new Struct.LONG(); //<-- not working
+        //public final PointerByReference data; //TODO add in rest of structure
+        //public final Struct.Pointer[] data; // Or this ???
+        public FfiStrList(jnr.ffi.Runtime runtime /*, java.lang.String[] sAry*/) {
+            super(runtime);
+        }
+    }
+
     public static class NumericStruct extends Struct {
         public final Struct.Signed8 val_int8_t = new Struct.Signed8();
         public final Struct.Signed16 val_int16_t = new Struct.Signed16();
@@ -87,6 +97,8 @@ public void reset() {
     }
 
     public static interface Lib {
+
+        public long struct_num_al_test(FfiStrList s);
         public byte struct_num_get_int8_t(NumericStruct s);
         public void struct_num_set_int8_t(NumericStruct s, byte v);
 
@@ -145,6 +157,15 @@ public static void beforeAll() {
         runtime = Runtime.getRuntime(lib);
     }
 
+    @Test
+    public void testAlNumeric() {
+        FfiStrList s = new FfiStrList(runtime);
+        s.count.set(34);
+
+        long r = lib.struct_num_al_test(s);
+        assertEquals(34, r);
+    }
+
     // ========================= Byte ===============================
 
     @Test