[JAVA] Mapping json to an already instantiated Object

To a bean class that cannot use the default constructor with no arguments It can be used when mapping Json.

• Only when all Bean fields are String

Source

import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ObjectMapper2 extends ObjectMapper{
	public <T> T readValue(String content, T bean)
		        throws IOException, JsonParseException, JsonMappingException
	{
		// JSON -> Map
		Map<String,String> map = null;
		ObjectMapper mapper = new ObjectMapper();
		try {
			map = mapper.readValue(content, new TypeReference<LinkedHashMap<String,String>>(){});
		} catch (Exception e) {
			e.printStackTrace();
		}
		map.forEach( (key,value)->{
			try{
				org.apache.commons.lang3.reflect.FieldUtils.writeDeclaredField(bean, key, value, true);
			}catch(Exception e){
				e.printStackTrace();
			}
		});
		return bean;
	}

}

Caller

AbcBean bean = objectMapper.readValue(loginSessionJson, new AbcBean(null,null,null));