Digital Persona one touch sdk- cannot perform verification in java

Question

I've captured a featureset in the form of a string using an applet. I need to convert that string back into bytes and deserialize it in order to match it. But I dont know where am going wrong as its not comparing the template with the featureset. I've been fighting with this for weeks, Please anyone help me.

//Converting string stored in db back to template:
            byte[] byteArray = new byte[1];
            byteArray = hexStringToByteArray(dbTemplate);
            DPFPTemplate template = DPFPGlobal.getTemplateFactory().createTemplate();
            template.deserialize(byteArray);

//Converting featureset string captured by applet 
            byte[] fsArray = new byte[1];
            fsArray = hexStringToByteArray(ftsetstring);
            DPFPFeatureSet features = null;
            features.deserialize(fsArray);

//Comparing template with features acquired
            DPFPVerification matcher =   DPFPGlobal.getVerificationFactory().createVerification();
            DPFPVerificationResult fresult = matcher.verify(features, template);

                if (fresult.isVerified()) {

                    return "The fingerprint was VERIFIED.";

                } else {
                    return "The fingerprint was NOT VERIFIED.";

Where is my error???

Answer 1

I've never used Digital Persona before, but in any API, this:

        DPFPFeatureSet features = null;
        features.deserialize(fsArray);

Will cause a NullPointerException. I tried to look up how to correctly use the class but you have to be a member of Digital Persona to see the javadoc. Sorry!