JsonMappingException: No content to map due to end-of-input

[PedroMrChaves]

Hello,

I recently started programming with Apache Flink API. I am trying to get input directly
from kafka in a JSON format with the following code:

private void kafkaConsumer(String server, String topic) {
                Properties properties = new Properties();
                properties.setProperty("bootstrap.servers", server);
                properties.setProperty("group.id", "Demo");
                stream = environment.addSource(new FlinkKafkaConsumer09<>(topic, new JSONDeserializationSchema(), properties))
                                .map(new MapFunction<ObjectNode, Event>() {
                                        @Override
                                        public Event map(ObjectNode value) throws Exception {
                                                return new Event(Integer.parseInt(value.get("id").asText()), value.get("user").asText(),
                                                                value.get("action").asText(), value.get("ip").asText());
                                        }
                                });
        }

But I alwys get the following error:


17:56:46,335 ERROR org.apache.flink.runtime.taskmanager.Task                     - Task execution failed.
com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input
 at [Source: [B@69a90966; line: 1, column: 1]
        at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
        at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:3095)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3036)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2215)
        at org.apache.flink.streaming.util.serialization.JSONDeserializationSchema.deserialize(JSONDeserializationSchema.java:38)
        at org.apache.flink.streaming.util.serialization.JSONDeserializationSchema.deserialize(JSONDeserializationSchema.java:30)
        at org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper.deserialize(KeyedDeserializationSchemaWrapper.java:39)
        at org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.run(Kafka09Fetcher.java:227)
        at java.lang.Thread.run(Thread.java:745)

What am I doing wrong?

Attached follows the JSON sample that I am using.

Thank you and Regards.

log.json

[Stephan Ewen]

This sounds like it is not Flink related - it seems more like a Jackson/Json question than a Flink question.

On Thu, Oct 13, 2016 at 5:56 PM, PedroMrChaves <[hidden email]> wrote:

Hello,

I recently started programming with Apache Flink API. I am trying to get
input directly
from kafka in a JSON format with the following code:

/private void kafkaConsumer(String server, String topic) {
                Properties properties = new Properties();
                properties.setProperty("bootstrap.servers", server);
                properties.setProperty("group.id", "Demo");
                stream = environment.addSource(new FlinkKafkaConsumer09<>(topic, new
JSONDeserializationSchema(), properties))
                                .map(new MapFunction<ObjectNode, Event>() {
                                        @Override
                                        public Event map(ObjectNode value) throws Exception {
                                                return new Event(Integer.parseInt(value.get("id").asText()),
value.get("user").asText(),
                                                                value.get("action").asText(), value.get("ip").asText());
                                        }
                                });
        }/

But I alwys get the following error:


/17:56:46,335 ERROR org.apache.flink.runtime.taskmanager.Task
- Task execution failed.
com.fasterxml.jackson.databind.JsonMappingException: No content to map due
to end-of-input
 at [Source: [B@69a90966; line: 1, column: 1]
        at
com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
        at
com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:3095)
        at
com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3036)
        at
com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2215)
        at
org.apache.flink.streaming.util.serialization.JSONDeserializationSchema.deserialize(JSONDeserializationSchema.java:38)
        at
org.apache.flink.streaming.util.serialization.JSONDeserializationSchema.deserialize(JSONDeserializationSchema.java:30)
        at
org.apache.flink.streaming.util.serialization.KeyedDeserializationSchemaWrapper.deserialize(KeyedDeserializationSchemaWrapper.java:39)
        at
org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.run(Kafka09Fetcher.java:227)
        at java.lang.Thread.run(Thread.java:745)/

What am I doing wrong?

Attached follows the JSON sample that I am using.

Thank you and Regards.

log.json
<http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/file/n9536/log.json>



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