Stack Trace and sample methods

Sample DTO being used in this test:

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class WalletDto {
    private String address;
    private BigDecimal balance;
}


Method used in the test:
@Cacheable(
            value = "ethereum-balances",
            key = "T(org.springframework.security.core.context.SecurityContextHolder).getContext().getAuthentication().getName()"
    )
    public WalletDto getWalletBalance() {
        User user = authService.getCurrentUser();

        EthereumWallet ethereumWallet = ethereumWalletRepository.findByUser(user)
                .orElseThrow(
                        () -> new EntityNotFoundException("User does not have an Ethereum wallet"));

        if (ethereumWallet.isTradingLocked()) {
            throw new WalletLockedException("Wallet is currently in a transaction, try again later");
        }

        String address = ethereumWallet.getAddress();
        BigInteger updatedBalanceWei = getBalance(address);
        BigDecimal updatedBalanceEth = Converter.convertWeiToEth(updatedBalanceWei);

        return WalletDto.builder()
                .address(address)
                .balance(updatedBalanceEth)
                .build();

    }

Stack trace sample:
org.springframework.data.redis.serializer.SerializationException: Cannot serialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [com.kollybistes.common.dtos.WalletDto]
	at org.springframework.data.redis.serializer.JdkSerializationRedisSerializer.serialize(JdkSerializationRedisSerializer.java:96)
	at org.springframework.data.redis.serializer.DefaultRedisElementWriter.write(DefaultRedisElementWriter.java:44)
	at org.springframework.data.redis.serializer.RedisSerializationContext$SerializationPair.write(RedisSerializationContext.java:287)
	at org.springframework.data.redis.cache.RedisCache.serializeCacheValue(RedisCache.java:282)
	at org.springframework.data.redis.cache.RedisCache.put(RedisCache.java:168)
	at org.springframework.cache.interceptor.AbstractCacheInvoker.doPut(AbstractCacheInvoker.java:87)
	at org.springframework.cache.interceptor.CacheAspectSupport$CachePutRequest.apply(CacheAspectSupport.java:837)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:430)
	at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:345)
	at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:64)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:753)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:698)
	at com.kollybistes.core.services.EthereumService$$EnhancerBySpringCGLIB$$c3c3bd41.getWalletBalance(<generated>)