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Re: cannot resolve constructor when invoke FlinkKafkaProducer011 constructor in scala


IDEA only show "cannot resolve constructor" error message, without other error message.  

Dawid Wysakowicz <dwysakowicz@xxxxxxxxxx> 于2018年10月10日周三 下午5:55写道:

Hi,

what is the exact error message you are getting?

Best,

Dawid


On 10/10/18 11:51, 远远 wrote:
invoke FlinkKafkaProducer011 constructor in scala:
val producer = new FlinkKafkaProducer011[PVEvent.Entity](appConf.getPvEventTopic, new PvEventSerializeSchema,
    producerProps, Optional.of(FlinkRebalancePartitioner[PVEvent.Entity]))
and the constructor is :

/**
 * Creates a FlinkKafkaProducer for a given topic. The sink produces its input to
 * the topic. It accepts a keyed {@link KeyedSerializationSchema} and possibly a custom {@link FlinkKafkaPartitioner}.
 *
 * <p>If a partitioner is not provided, written records will be partitioned by the attached key of each
 * record (as determined by {@link KeyedSerializationSchema#serializeKey(Object)}). If written records do not
 * have a key (i.e., {@link KeyedSerializationSchema#serializeKey(Object)} returns {@code null}), they
 * will be distributed to Kafka partitions in a round-robin fashion.
 *
 * @param defaultTopicId The default topic to write data to
 * @param serializationSchema A serializable serialization schema for turning user objects into a kafka-consumable byte[] supporting key/value messages
 * @param producerConfig Configuration properties for the KafkaProducer. 'bootstrap.servers.' is the only required argument.
 * @param customPartitioner A serializable partitioner for assigning messages to Kafka partitions.
 *                          If a partitioner is not provided, records will be partitioned by the key of each record
 *                          (determined by {@link KeyedSerializationSchema#serializeKey(Object)}). If the keys
 *                          are {@code null}, then records will be distributed to Kafka partitions in a
 *                          round-robin fashion.
 */
public FlinkKafkaProducer011(
      String defaultTopicId,
      KeyedSerializationSchema<IN> serializationSchema,
      Properties producerConfig,
      Optional<FlinkKafkaPartitioner<IN>> customPartitioner) {
   this(
      defaultTopicId,
      serializationSchema,
      producerConfig,
      customPartitioner,
      Semantic.AT_LEAST_ONCE,
      DEFAULT_KAFKA_PRODUCERS_POOL_SIZE);
}
but cannot complie pass, and IDEA show ''cannot resolve constructor" error. 
and i invoke other constructor that without java8 Optional params, it  will no
error。  because of java8 Optional param?what should i do?