Schema Parse Exception

[sowmya291098]

I want to create a parquet file from payload in CentOS. Previously I was using spark which is creating a directory instead of file and returns error saying unable to write to a directory. Now I am trying to figure out how to write using Parquetavrowriter where

Routing route=new Routing(); (route.setters are null)
String s1 = objectMapper.writeValueAsString(route);
Schema schema2 = new Schema.Parser().parse(s1);

Following is the error:

org.apache.avro.SchemaParseException: No type: {"id":null,"item":null}