[AVRO-1807] NullPointerException from Json.ObjectWriter

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 1.8.0
• Fix Version/s: 1.8.1
• Component/s: java

Environment

avro 1.8.0
jackson-core-asl 1.9.13
jackson-mapper-asl 1.9.13
Java 7
Mac OS X 10.11.3

• Assignee: Ryan Blue
• Reporter: Thomas Lörtsch
• Created: 08/Mar/16 15:59
• Updated: 14/May/16 20:47
• Resolved: 14/May/16 20:47

Description

/* I posted this bug already to the dev-mailinglist [4]. Reporting it here again only to make sure it doesn't get lost and because this is the right place. */

The complete, slightly more involved code is on [1], especially [2], the JSON schema is at [3], but the relevant parts of the code follow below.

// parsing the schema
Schema.Parser parser = new Schema.Parser();
Schema schema = parser.parse(new File("schema.avsc")) ;
// setting up the encoder and driver
Json.ObjectWriter jsonDatumWriter = new Json.ObjectWriter();
OutputStream output = new FileOutputStream(new File("output.json"));
Encoder encoder = EncoderFactory.get().jsonEncoder(schema, output, pretty);
// writing
System.out.println(payload); // reassuring test the payload is intact
jsonDatumWriter.write(payload, encoder);

The console will print out a nice JSON string (the payload), followed by the following exception:

Exception in thread "main" java.lang.NullPointerException
at org.apache.avro.data.Json.write(Json.java:183)
at org.apache.avro.data.Json.writeObject(Json.java:272)
at org.apache.avro.data.Json.access$000(Json.java:48)
at org.apache.avro.data.Json$ObjectWriter.write(Json.java:122)
at converTor.WriterObject.append(WriterObject.java:59)
at converTor.ConverTor.main(ConverTor.java:251)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

My beginners guess is that the source of the problem is a call of asToken() in org.codehaus.jackson.JsonNode, which is abstract.

[0] https://issues.apache.org/jira/browse/avro/?selectedTab=com.atlassian.jira.jira-projects-plugin:summary-panel
[1] https://github.com/tomlurge/converTor
[2] https://github.com/tomlurge/converTor/blob/master/src/converTor/WriterObject.java
[3] https://github.com/tomlurge/converTor/blob/master/src/converTor/avro/schemata/Torperf.avsc
[4] https://mail-archives.apache.org/mod_mbox/avro-dev/201603.mbox/ajax/%3C828828B1-8A58-4050-81B4-C3EF0F26041B%40rat.io%3E

Issue Links

• blocks: AVRO-1833 Release 1.8.1