How can I use JsonParser (javax.json.stream.JsonParser) twice

Question

I need to use a JsonParser twice, once to validate the format of my JsonStream by the json schema given..., then I need to contruct my object 'Product'.

The problem is that if I use the parser once, I cannot re-use it a second time. It's like it loses its data values .

Here is my Original code where I construct my Product object using the parser.. :

import javax.json.bind.serializer.DeserializationContext;
import javax.json.bind.serializer.JsonbDeserializer;
import javax.json.stream.JsonParser;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

 
public class ProductDeserializer implements JsonbDeserializer<Product>
{
    @Override
    public Product deserialize(final JsonParser parser, final DeserializationContext ctx, final Type rtType)
    {

        Product product = new Product();
         
        while (parser.hasNext())
        {
            JsonParser.Event event = parser.next();
            if (event == JsonParser.Event.KEY_NAME && parser.getString().equals("productNumber"))
            {
                parser.next();
                product.setProductNumber(parser.getString());

This works fine But I need to include this validation of the json format first..:

 ObjectMapper objectMapper = new ObjectMapper();
        JsonSchemaFactory schemaFactory = JsonSchemaFactory.getInstance(SpecVersion.VersionFlag.V201909);
        String schemaStream = "My json schema here..";

        JsonNode json = null;
        try
        {
            json = objectMapper.readTree(parser.getObject().toString());
        }
        catch (JsonProcessingException eParam)
        {
            eParam.printStackTrace();
        }
        JsonSchema schema = schemaFactory.getSchema(schemaStream);
        Set<ValidationMessage> validationResult = schema.validate(json);
        if (validationResult.isEmpty()) {
            System.out.println("no validation errors ");
        } else {
            System.out.println("There are validation errors ");
        }

So if I try to include this part then the contruction of my Product Object will not work anymore and the Product will be null..

So my question is how can I use the parser twice in the same method .. Thanks a lot in advance..