Json.ObjectWriter - "Not the Json schema"

[tl]

Hi,


I want to convert incoming data to Avro and JSON (and later Parquet). Avro 
conversion is working okay, but JSON conversion throws the following error that 
I don’t understand:

Exception in thread "main" java.lang.RuntimeException: Not the Json schema: 
{"type":"record","name":"Torperf","namespace":"converTor.torperf","fields":[{"name":"descriptor_type","type":"string","default":"torperf
 1.0"},
[ … omitted for brevity …]
{"name":"circ_id","type":["null","int"],"doc":"metrics-lib/TorperfResult: int 
getCircId()"},{"name":"used_by","type":["null","int"],"doc":"metrics-lib/TorperfResult:
 int getUsedBy()"}],"aliases":["torperfResult"]}
        at org.apache.avro.data.Json$ObjectWriter.setSchema(Json.java:117)
        at converTor.WriterObject.<init>(WriterObject.java:116)
        at converTor.TypeWriter.get(TypeWriter.java:31)
        at converTor.ConverTor.main(ConverTor.java:249)
        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)

… but that schema is indeed the schema that I want to use.


This is a snippet of my code:

File schemaFile = new File("schema/jsonSchema.avsc");
Schema.Parser parser = new Schema.Parser();
Schema mySchema = parser.parse(schemaFile) ;

Json.ObjectWriter jsonDatumWriter = new Json.ObjectWriter();
jsonDatumWriter.setSchema(mySchema);
OutputStream out = new FileOutputStream(outputFile);
Encoder encoder = EncoderFactory.get().jsonEncoder(mySchema, out);


Can somebody give me a hint?


Thanks,
Thomas