Spring Boot Redis custom json serializer example.

App.java

package demo;

import java.io.Serializable;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import com.fasterxml.jackson.annotation.JsonTypeInfo.As;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectMapper.DefaultTyping;

@SpringBootApplication
public class App {

	@Bean
	@Primary
	RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory rcf) {

		RedisTemplate<String, Object> template = new RedisTemplate<>();
		template.setConnectionFactory(rcf);
		template.setKeySerializer(new StringRedisSerializer());
		template.setValueSerializer(new JsonRedisSerializer());

		return template;
	}

	static class JsonRedisSerializer implements RedisSerializer<Object> {

		private final ObjectMapper om;

		public JsonRedisSerializer() {
			this.om = new ObjectMapper().enableDefaultTyping(DefaultTyping.NON_FINAL, As.PROPERTY);
		}

		@Override
		public byte[] serialize(Object t) throws SerializationException {
			try {
				return om.writeValueAsBytes(t);
			} catch (JsonProcessingException e) {
				throw new SerializationException(e.getMessage(), e);
			}
		}

		@Override
		public Object deserialize(byte[] bytes) throws SerializationException {
			
			if(bytes == null){
				return null;
			}
			
			try {
				return om.readValue(bytes, Object.class);
			} catch (Exception e) {
				throw new SerializationException(e.getMessage(), e);
			}
		}
	}

	public static void main(String[] args) {

		RedisOperations<String, Object> redis = SpringApplication.run(App.class, args).getBean(RedisOperations.class);
		
		A a = new B();
		System.out.println(a);
		redis.opsForValue().set("foo", a);
		
		A aa = (A)redis.opsForValue().get("foo");
		System.out.println(aa);
		
	}

	public static class A implements Serializable{
		
		long longProperty = System.currentTimeMillis();
		String stringProperty = "foo";

		public String getStringProperty() {
			return stringProperty;
		}

		public void setStringProperty(String stringProperty) {
			this.stringProperty = stringProperty;
		}

		@Override
		public String toString() {
			return "A [stringProperty=" + stringProperty + "]";
		}
	}

	public static class B extends A {

		int intProperty = 42;

		public int getIntProperty() {
			return intProperty;
		}

		public void setIntProperty(int intProperty) {
			this.intProperty = intProperty;
		}

		@Override
		public String toString() {
			return "B [intProperty=" + intProperty + ", stringProperty=" + stringProperty + "]";
		}
	}
}

thanks for sharing !