Task not serializable: java.io.NotSerializableException when calling function in Serializable class - scala

Question

I have a class which is Serializable
class GetTaxResilience extends Serializable {
private val logger = LoggerFactory.getLogger(this.getClass)
val retryConfig = RetryConfig.custom()
.maxAttempts(RESILIENCE_RETRY_MAX_ATTEMPTS)
.retryExceptions(classOf[StatusRuntimeException])
.retryOnException(asJavaPredicate(exception => exception.isInstanceOf[StatusRuntimeException]))
.intervalFunction(IntervalFunction.ofRandomized(RESILIENCE_RETRY_INTERVAL_MILLISECONDS))
.build
val retryRegistry = RetryRegistry.of(retryConfig)
val retryInstance = retryRegistry.retry(GET_VERTEX_TAX_RETRY_DEFAULT_NAME, retryConfig)
def getDefaultRetryInstance(): Retry = {
// default retry instance configured in yaml
logger.info("Retrieving default retry instance: {}", GET_VERTEX_TAX_RETRY_DEFAULT_NAME)
retryInstance
}
}
In my main function, I'm calling getDefaultRetryInstance function
class mainClass extends Serializable{
#Autowired
var getTaxResilience: GetTaxResilience = null
getTaxResilience.getDefaultRetryInstance()
//get error at this line
calculateResultDF.write.mode(SaveMode.Overwrite).insertInto(sqlTableHelper.VERTEX_CALCULATE_RESULT_TABLE)
}
but I got error
Task not serializable: java.io.NotSerializableException: java.util.function.Predicate$$Lambda$310/1296833449
App > Serialization stack:
App > - object not serializable (class: java.util.function.Predicate$$Lambda$310/1296833449, value: java.util.function.Predicate$$Lambda$310/1296833449#6e15fe26)
App > - field (class: io.github.resilience4j.retry.RetryConfig, name: exceptionPredicate, type: interface java.util.function.Predicate)
App > - object (class io.github.resilience4j.retry.RetryConfig, io.github.resilience4j.retry.RetryConfig#1f4ca8b5)
App > - field (class: determination.resilience.GetTaxResilience, name: retryConfig, type: class io.github.resilience4j.retry.RetryConfig)
...
it said "io.github.resilience4j.retry.RetryConfig, name: exceptionPredicate, type: interface java.util.function.Predicate" is not Serializable, but this class already implements Serializable.
public class RetryConfig implements Serializable {}
how can I fix this issue?