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What should I do if the Redis cache of OAuth2Authorization object fails in Spring Boot?
What should I do if the Redis cache of OAuth2Authorization object fails in Spring Boot?
Apr 19, 2025 pm 08:03 PM
Serialization problems and solutions encountered when using Redis to cache OAuth2Authorization objects in Spring Boot applications
In Spring Boot applications, when combining Spring Security OAuth2 Authorization Server (version 3.1.0) and Redis for cache management, you often encounter the problem of failing to serialize OAuth2Authorization objects to Redis. This article will analyze the causes of the problem and provide effective solutions.
Problem description:
The project relies on spring-boot-starter-oauth2-authorization-server and uses RedisTemplate to cache data. RedisTemplate uses Jackson as the serializer ( RedisSerializer.json() ). However, after cached the OAuth2Authorization object to Redis, it cannot be deserialized. The root cause is that the AuthorizationGrantType class inside the OAuth2Authorization object lacks a parameterless constructor, which causes Jackson to fail to serialize and deserialize correctly. Although using RedisSerializer.java() can solve the serialization problem, the generated binary data is poorly readable, which is not conducive to debugging.
Solution:
In order to solve the serialization problem caused by the lack of parameterless constructor of AuthorizationGrantType class, we can take advantage of Jackson's Mixin function. Create a Mixin class AuthorizationGrantTypeMixin and add a constructor annotated with @JsonCreator , which receives a string parameter to meet Jackson's deserialization needs.
Code example:
public abstract class AuthorizationGrantTypeMixin {
@JsonCreator
public AuthorizationGrantTypeMixin(@JsonProperty("value") String value) { }
}
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.addMixIn(AuthorizationGrantType.class, AuthorizationGrantTypeMixin.class);
RedisSerializer<object> serializer = new GenericJackson2JsonRedisSerializer(objectMapper);
template.setDefaultSerializer(serializer);</object>
This code first defines a Mixin class AuthorizationGrantTypeMixin , providing a custom constructor for the AuthorizationGrantType class. Then, create an ObjectMapper instance and register AuthorizationGrantTypeMixin as the Mixin of AuthorizationGrantType class. Finally, create a GenericJackson2JsonRedisSerializer using a custom ObjectMapper and set it as the default serializer for RedisTemplate . In this way, the OAuth2Authorization object can be correctly serialized and deserialized into Redis, while maintaining the readability of JSON data.
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