PojoToMap.java

import com.fasterxml.jackson.databind.BeanDescription;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationConfig;
import com.fasterxml.jackson.databind.introspect.BeanPropertyDefinition;
import com.fasterxml.jackson.databind.introspect.ClassIntrospector;

import java.util.LinkedHashMap;
import java.util.Map;

public class PojoToMap {
    private final ObjectMapper mapper = new ObjectMapper();
    
    public <T> Map<String, Object> pojoToMap(T pojo) {
        SerializationConfig serializationConfig = mapper.getSerializationConfig();
        ClassIntrospector classIntrospector = serializationConfig.getClassIntrospector();
        JavaType javaType = serializationConfig.getTypeFactory().constructType(pojo.getClass());
        BeanDescription beanDescription = classIntrospector.forSerialization(serializationConfig, javaType, serializationConfig);
        Map<String, Object> map = new LinkedHashMap<>();
        for (BeanPropertyDefinition propDef : beanDescription.findProperties()) {
            map.put(propDef.getName(), propDef.getAccessor().getValue(pojo));
        }
        return map;
    }
}