title: How to create a valid JSON example from Avro Schema?
body: <p>Got a fairly complicated Avro schema (which I can not modify).</p>
  
  <p>Trying to mock JSON example in java:<br></p>
  
  <pre><code>GenericRecord genericRecord = AvroUtil.jsonToGenericRecord(jsonData, avroSchema);
  </code></pre>
  
  <p>It keeps failing:</p>
  
  <pre><code>Exception in thread "main" org.apache.avro.AvroTypeException: Expected start-union. Got VALUE_STRING
  </code></pre>
  
  <p>Is there e.g. online tool that will provide example of JSON data for any given Avro schema? (so that it can match correctly)</p>
  
  <p>Tried mocking JSON data for hours and still no success..</p>