(DEPRECATED) Apache Flink User Mailing List archive.

AvroInputFormat NullPointerException issues

Posted by Porritt, James on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/AvroInputFormat-NullPointerException-issues-tp21485.html

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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