lang/java/integration-test/codegen-test/src/test/resources/avro/custom_conversion.avsc

{"namespace": "org.apache.avro.codegentest.testdata",
  "type": "record",
  "name": "LogicalTypesWithCustomConversion",
  "doc" : "Test unions with logical types in generated Java classes",
  "fields": [
    {"name": "nullableCustomField",  "type": ["null", {"type": "bytes", "logicalType": "decimal", "precision": 9, "scale": 2}], "default": null},
    {"name": "nonNullCustomField",  "type": {"type": "bytes", "logicalType": "decimal", "precision": 9, "scale": 2}},
    {"name": "nullableFixedSizeString",  "type": ["null", {"type": "bytes", "logicalType": "fixed-size-string", "minLength": 1, "maxLength": 50}], "default": null},
    {"name": "nonNullFixedSizeString",  "type": {"type": "bytes", "logicalType": "fixed-size-string", "minLength": 1, "maxLength": 50}}
  ]
}