Question 197250 in Redis Question posted in
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ClassCastException: with unnamed module of loader 'app': Spring Data Redis

I am working on a small demo project for Redis and Spring Boot. But for the following GET endpoints I am getting ClassCastException.–

@GetMapping("/all")
    public List<Product> getAllProducts(){
        return productRepository.findAll();
    }

    @GetMapping("/product/{id}")
    public Product finProduct(@PathVariable int id){
        return productRepository.findProductById(id);
    }

Serivces-

public List<Product> findAll() {
        List<Product> products=new ArrayList<>();
        redisTemplate.opsForHash().values(HASH_KEY).forEach(e->products.add((Product)e));
        return products;
    }

    public Product findProductById(int id) {

        return (Product) redisTemplate.opsForHash().get(HASH_KEY, id);
    }

I am getting following error-

java.lang.ClassCastException: class com.ayushsingh.springdataredisdemo.entity.Product cannot be cast to class com.ayushsingh.springdataredisdemo.entity.Product (com.ayushsingh.springdataredisdemo.entity.Product is in unnamed module of loader 'app'; com.ayushsingh.springdataredisdemo.entity.Product is in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @18f69edd)

I referred the following article: https://medium.com/javarevisited/classcast-exception-when-using-redis-and-springboot-frameworks-in-conjunction-ea132dd0d7ea, but still getting same error.
Beans-

@Configuration
@EnableRedisRepositories
public class RedisConfig {

    // Connection Configuration
    @Bean
    public JedisConnectionFactory connectionFactory() {
        RedisStandaloneConfiguration configuration = new RedisStandaloneConfiguration();
        configuration.setHostName("localhost");
        configuration.setPort(6379);
        Duration readTimeout = Duration.ofMillis(30 * 1000);
        Duration connectTimeout = Duration.ofMillis(3 * 1000);
        JedisClientConfiguration clientConfiguration = JedisClientConfiguration.builder()
                .readTimeout(readTimeout)
                .connectTimeout(connectTimeout)
                .usePooling()
                .build();
        JedisConnectionFactory jedisConnectionFactory = new JedisConnectionFactory(configuration, clientConfiguration);
        return jedisConnectionFactory;
    }

    // Redis template to acces Redis server
    @Bean
    public RedisTemplate<String, Object> redisTemplate() {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory());
        template.setKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashKeySerializer(new JdkSerializationRedisSerializer(getClass().getClassLoader()));
        template.setValueSerializer(new JdkSerializationRedisSerializer(getClass().getClassLoader()));
        template.setEnableTransactionSupport(true);

        template.afterPropertiesSet();
        return template;
    }
}

application properties-

spring.devtools.restart.enabled=false
server.port=8082

Please help!

Tags:

2

Answers


  1. 0

    I met the same error. The only way is to remove spring-devtools module. It seems like to be caused by ClassLoader. But I don’t know how to solve it. But removing this module really worked.

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  2. 0

    try this way:

    you need to set a System property before calling SpringApplication.run(…​). For example:

    public static void main(String[] args) {
System.setProperty("spring.devtools.restart.enabled", "false");
SpringApplication.run(MyApp.class, args);}

    Reference Spring Doc

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