Java HotSpot Virtual Machine

Hello, I've been trying to figure this out but so far no luck. Here's what I have in C:

typedef struct _strvectitem
{
char *szValue;
void *pData;
struct _strvectitem *pNext;
} STRVECTITEM, *PSTRVECTITEM;

typedef struct _strvect
{
unsigned long nNumItems;
PSTRVECTITEM pFirst;
PSTRVECTITEM pLast;
} STRVECT, *PSTRVECT;

which I have translated to Java following the JNA API

public static class PStrVectItem extends Structure {
public static class ByReference extends PStrVectItem implements Structure.ByReference {}

public String szValue;
public Pointer pData;
public PStrVectItem.ByReference pNext;
}

public static class PNameVect extends Structure {
public static class ByReference extends PNameVect implements Structure.ByReference {}

public NativeLong nNumItems;
public PStrVectItem.ByReference pFirst;
public PStrVectItem.ByReference pLast;
}

This works well if I call a function:

//--- C ---
int PassStructurePtr( PNAMEVECT pItem );

translated in Java to

//--- Java ---
int PassStructurePtr(PNameVect pItem);

PNameVect pItem = PNameVect();
PassStructurePtr(pItem);

BUT I can't figure out what to pass to a function that has the following signature:

//--- C ---
int PassStructurePtrPtr( PNAMEVECT *ppItem );

I have tried passing the PNameVect by reference like this:

//--- Java ---
int PassStructurePtrPtr(PNameVect ppItem);

PNameVect.ByReference ppItem = PNameVect.ByReference();
PassStructurePtrPtr(ppItem);

but this does not seem to work.

What am I doing wrong? Thanks for the help!

Slawek