SpringBoot java.lang.ClassCastException (unnamed module of loader 'app') error with Spring Data Redis

I am trying to use Redis with Spring Boot. I am facing error as described- Steps- 1. I created a Spring Boot Application with following dependencies-

<dependency>
            <groupId>redis.clients</groupId>
            <artifactId>jedis</artifactId>
            <version>5.0.0-alpha1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

1. I have added the following Configuration for Redis-

    @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;
    }

    @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());
        template.setValueSerializer(new JdkSerializationRedisSerializer(getClass().getClassLoader()));
        template.setEnableTransactionSupport(true);

        template.afterPropertiesSet();
        return template;
    }

1. Entity-

@Data
@AllArgsConstructor
@NoArgsConstructor
@RedisHash("Product")
public class Product implements Serializable{


    @Id
    private int id;

    private String name;

    private int qty;

    long price;
}

1. Created some rest endpoints-

@RestController
@RequestMapping("/redisdemo")
public class ProductController {

    @Autowired
    ProductRepository productRepository;

    @PostMapping("/save")
    public Product save(@RequestBody Product product){
        return productRepository.saveProduct(product);
    }

    @DeleteMapping("/delete/{id}")
    public String delete(@PathVariable int id){
        return productRepository.deleteProduct(id);
    }

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

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

Working- 1. /save- To save the entity (working as expected) 2. /delete- To delete entity (working as expected) 3. /all- List all the entities (ClassCastException) 4. /product/{id}- List the entity by id (ClassCastException) The exception is-

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';

Also posted on Stackoverflow- https://stackoverflow.com/questions/75943457/classcastexception-with-unnamed-module-of-loader-app-spring-data-redis

Comment From: philwebb

Lets keep the discussion on stackoverflow.