spring-boot RedisTemplate<String,User> exception - redis

Question

My code like this:
Java:
#Autowired
private RedisTemplate<String,User> myTemplate;
#Override
public String login(String email, String password) {
User user = this.userRepository.findByEmailAndPassword(email, password);
System.out.println(user);
if (user == null) return null;
String key1 = "lic" + "$" + user.getId() + "$" + user.getRole() + "$" + user.getName() + "$" + user.getEmail();
ValueOperations<String, User> ops = this.myTemplate.opsForValue();
if (!this.myTemplate.hasKey(key1)) {
ops.set(key1, user);
}
return key1;
}
when app run, inject bean ,like this:
#SpringBootApplication
public class ApplicationApp extends WebMvcConfigurerAdapter {
// #Autowired
// private RedisTemplate<String,String> template;
#Bean
JedisConnectionFactory jedisConnectionFactory() {
return new JedisConnectionFactory();
}
#Bean
RedisTemplate<String, User> redisTemplate() {
final RedisTemplate<String, User> template = new RedisTemplate<String, User>();
template.setConnectionFactory(jedisConnectionFactory());
template.setKeySerializer(new StringRedisSerializer());
template.setHashValueSerializer(new GenericToStringSerializer<User>(User.class));
template.setValueSerializer(new GenericToStringSerializer<User>(User.class));
return template;
}
#Override
public void addInterceptors(InterceptorRegistry registry) {
// super.addInterceptors(registry);
registry.addInterceptor(new AuthorAccess()).addPathPatterns("/api/sc/**");
}
public static void main(String[] args) throws Exception {
SpringApplication.run(ApplicationApp.class, args);
}
}
then , call login service found error like this:
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type com.qycloud.oatos.license.domain.User to type java.lang.String

Answer 1

Set ValueSerializer with Jackson2JsonRedisSerializer instead of GenericToStringSerializer and it should work. GenericToStringSerializer do not support Object to String conversion.
template.setValueSerializer(new Jackson2JsonRedisSerializer<User>(User.class));

Answer 2

You need to register you're own implementation of TypeConverter or a ConversionService able to deal with User.class via eg. setTypeConverter(TypeConverter converter). Otherwise GenericToStringSerializer will just try using the DefaultConversionService which does not know about your type.