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Jackson (https://github.com/FasterXML/jackson) extension module that uses LambdaMetafactory based code generation to replace reflection calls.

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package com.fasterxml.jackson.module.blackbird.deser;

import java.io.IOException;
import java.util.function.BiConsumer;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.SettableBeanProperty;

final class SettableStringProperty
    extends OptimizedSettableBeanProperty
{
    private static final long serialVersionUID = 1L;
    private final BiConsumer _optimizedSetter;

    public SettableStringProperty(SettableBeanProperty src, BiConsumer optimizedSetter)
    {
        super(src);
        _optimizedSetter = optimizedSetter;
    }

    @Override
    protected SettableBeanProperty withDelegate(SettableBeanProperty del) {
        return new SettableStringProperty(del, _optimizedSetter);
    }

    /*
    /**********************************************************************
    /* Deserialization
    /**********************************************************************
     */

    // Copied from StdDeserializer.StringDeserializer:
    @Override
    public void deserializeAndSet(JsonParser p, DeserializationContext ctxt, Object bean) throws IOException
    {
        if (!p.hasToken(JsonToken.VALUE_STRING)) {
            delegate.deserializeAndSet(p, ctxt, bean);
            return;
        }
        set(bean, p.getText());
    }

    @Override
    public Object deserializeSetAndReturn(JsonParser p, DeserializationContext ctxt, Object instance) throws IOException
    {
        if (p.hasToken(JsonToken.VALUE_STRING)) {
            return setAndReturn(instance, p.getText());
        }
        return delegate.deserializeSetAndReturn(p, ctxt, instance);
    }

    @Override
    public void set(Object bean, Object value) throws IOException {
        try {
            _optimizedSetter.accept(bean, (String) value);
        } catch (Throwable e) {
            _reportProblem(bean, value, e);
        }
    }
}