Re: AvroInputFormat NullPointerException issues

Posted by vino yang on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/AvroInputFormat-NullPointerException-issues-tp21485p21508.html

Hi Porritt,

Based on the exception stack trace you provided, it seems the exception occurs when initializing Avro schema. You did not give the definition of the MyAvroSchema Class, so I'd to suggest you :

1. make sure the file path "file:///home/myuser/test.avro" exists in your tm node which run your source task.

2. here is the flink-avro connector documentation[1] you can refer

3. there are many test case such as this[2], you can use to test your program, just need a little change

[1]: https://ci.apache.org/projects/flink/flink-docs-release-1.5/dev/batch/connectors.html#avro-support-in-flink

[2]: https://github.com/apache/flink/blob/master/flink-formats/flink-avro/src/test/java/org/apache/flink/formats/avro/AvroInputFormatTypeExtractionTest.java

---

thanks.

vino.

2018-07-16 20:22 GMT+08:00 Porritt, James <[hidden email]>:

I’ve been trying to use the following code:

 

        ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        Path path = new Path("file:///home/myuser/test.avro");

        AvroInputFormat<MyAvroSchema> my_format = new AvroInputFormat<>(path, MyAvroSchema.class);

        DataSet<MyAvroSchema> my_input = env.createInput(my_format);

        my_input.print();

        env.execute();

 

to utilise this avro schema:

 

{

  "type" : "record",

  "name" : "MyAvroSchema",

  "fields" : [ {

    "name" : "a",

    "type" : [ "null", "int" ]

  }, {

    "name" : "b",

    "type" : [ "null", "string" ]

  }]

}

 

I created the MyAvroSchema class from this schema using avro tools. I also converted the following JSON into a compatible avro stored in file:///home/myuser/test.avro

 

{"a":{"int":123},"b":{"string":"hello"}}

 

When I try and run this however I get:

 

2018-07-16 12:59:26,761 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph        - DataSource (at createInput(ExecutionEnvironment.java:548) (org.apache.flink.formats.avro.AvroInputFormat)

) (1/1) (302878b522f420f6b7866de4f32fcbd6) switched from RUNNING to FAILED.

org.apache.avro.AvroRuntimeException: avro.shaded.com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException

        at org.apache.avro.specific.SpecificData.getSchema(SpecificData.java:227)

        at org.apache.avro.specific.SpecificDatumReader.<init>(SpecificDatumReader.java:37)

        at org.apache.flink.formats.avro.AvroInputFormat.initReader(AvroInputFormat.java:122)

        at org.apache.flink.formats.avro.AvroInputFormat.open(AvroInputFormat.java:111)

        at org.apache.flink.formats.avro.AvroInputFormat.open(AvroInputFormat.java:54)

        at org.apache.flink.runtime.operators.DataSourceTask.invoke(DataSourceTask.java:170)

        at org.apache.flink.runtime.taskmanager.Task.run(Task.java:703)

        at java.lang.Thread.run(Thread.java:748)

Caused by: avro.shaded.com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException

        at avro.shaded.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2234)

        at avro.shaded.com.google.common.cache.LocalCache.get(LocalCache.java:3965)

        at avro.shaded.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3969)

        at avro.shaded.com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4829)

        at org.apache.avro.specific.SpecificData.getSchema(SpecificData.java:225)

        ... 7 more

Caused by: java.lang.NullPointerException

        at java.lang.String.replace(String.java:2239)

        at org.apache.avro.specific.SpecificData.createSchema(SpecificData.java:281)

        at org.apache.avro.specific.SpecificData$2.load(SpecificData.java:218)

        at org.apache.avro.specific.SpecificData$2.load(SpecificData.java:215)

        at avro.shaded.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3568)

        at avro.shaded.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2350)

        at avro.shaded.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2313)

        at avro.shaded.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2228)

        ... 11 more

 

Can anyone suggest what might be causing the NullPointerException? I’m using flink-1.5.0 and avro-tools-1.8.2

 

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