Memory Access Error with a JNA Structure that contains a pointer to an array of pointers

Question

Below is the code I am working with: C API:

typedef struct {
    int matId;
    int nMatNameSize;
    char* materialName;
    int isHyMat;
    lDVDetailOutput* dVOutputs;
} innerStruct;

typedef struct {
    int nMaterials;
    innerStruct** moreDetailOutputs;
} detailOutput;

int LDValues(const char* version,
             const detailInput* input,
             detailOutput* output);

JNA Declarations:

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

    int dValue;
    int nVars;
    yetAnotherStructure.ByReference vars;

    @Override
    protected List<String> getFieldOrder() {
        return Arrays.asList(new String[] { 
            "dValue", "nVars", "yetAnotherStructure", });
    }
}

public static class jInnerStruct extends Structure{
    int matId;
    int nMatNameSize;
    String materialName;
    int isHyMat;
    lDVDetailOutput.ByReference dValueOutputs;

    jInnerStruct() {
        super();
    }

    @Override
    protected List<String> getFieldOrder() {
        return Arrays.asList(new String[] { 
            "matId", "nMatNameSize", "materialName",
            "isHyMat", "dValueOutputs", });
    }
}

public static class jDetailOutput extends Structure {
    public static class ByReference extends detailOutput implements Structure.ByReference{}

    int nMaterials;
    Pointer moreDetailOutputs; // jInnerStruct**

    public jDetailOutput(Pointer p) {
        super(p);
        read();
    }

    @Override
    protected List<String> getFieldOrder() {
        return Arrays.asList(new String[] { 
            "nMaterials", "moreDetailOutputs", });
    }
}

public static LDValues(final String inputString,
                       final jDetailInput.ByReference inputValues,
                       jDetailOutput.ByReference outputValues) {}

In my main program I have the following code:

jDetailOutput.ByReference recvDetailOutput = new jDetailOutput.ByReference();

int success = LDValues(stringObject, inputValues, recvDetailOutput);

Pointer[] myDetailOutputPointers = recvDetailOutput.moreDetailOutputs.getPointerArray(0, recvDetailOutput.detailOutput.nMaterials);

jInnerStruct interimLMDO = new jInnerStruct(matDetailOutputPointers[0]);

I am getting a Memory Access error during the read() call in the jDetailOutput(Pointer P) constructor. Specifically when trying to read the dValueOutputs member of jInnerStruct.

Using the Eclipse debugger I see that dValueOutputs has a value of null. I do see that nMaterials in jDetailOutput has a correct value in it.

Do I need to create a different constructor for jInnerStruct?

Thanks, Doug