Allan Wax created AVRO-2190:
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Summary: ReflectData...getSchema() produces bad output for
abstract java classes
Key: AVRO-2190
URL: https://issues.apache.org/jira/browse/AVRO-2190
Project: Avro
Issue Type: Bug
Components: java
Affects Versions: 1.8.2
Environment: The working environment is Windows 10 with java 1.8 92
but I suspect this code will work on all systems.
Reporter: Allan Wax
ReflectData produces 'invalid' type entries for Abstract objects. An example
is InetAddress. What it produces is valid JSON but the schema cannot be used
to deserialize/read the serialized/write output. ReflectData produces is
{{{"type":"record","name":"InetAddress","namespace":"java.net","fields":[]}}}
but it should notice that InetAddress is an _abstract_ class and go find the
classes that extend the class.
{{{"type":"record","name":"Inet4Address","namespace":"java.net","fields":[]},\{"type":"record","name":"Inet6Address","namespace":"java.net","fields":[]}}}
I have a current workaround for this with the following, but it is a little
hacky and not that efficient if used alot.
{color:#000080}private static {color}String {color:#660e7a}abstractInetAddress
{color}=
{color:#008000}"{{color}{color:#000080}\"{color}{color:#008000}type{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}record{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}name{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}InetAddress{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}namespace{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}java.net{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}fields{color}{color:#000080}\"{color}{color:#008000}:[]}"{color};
{color:#000080}private static {color}String
{color:#660e7a}abstractInetAddressReplacement {color}= {color:#808080}//
{color}
{color:#008000}"{{color}{color:#000080}\"{color}{color:#008000}type{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}record{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}name{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}Inet4Address{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}namespace{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}java.net{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}fields{color}{color:#000080}\"{color}{color:#008000}:[]}"
{color}+ {color:#808080}//
{color}
{color:#008000}",{{color}{color:#000080}\"{color}{color:#008000}type{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}record{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}name{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}Inet6Address{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}namespace{color}{color:#000080}\"{color}{color:#008000}:{color}{color:#000080}\"{color}{color:#008000}java.net{color}{color:#000080}\"{color}{color:#008000},{color}{color:#000080}\"{color}{color:#008000}fields{color}{color:#000080}\"{color}{color:#008000}:[]}"{color};
{color:#000080}public {color}AvroUtil(Class<{color:#20999d}T{color}> clazz) {
{color:#660e7a}schema {color}= ReflectData.AllowNull.get().getSchema(clazz);
String s =
{color:#660e7a}schema{color}.toString().replace({color:#660e7a}abstractInetAddress{color},
{color:#660e7a}abstractInetAddressReplacement{color});
{color:#660e7a}schema {color}= {color:#000080}new
{color}Schema.Parser().parse(s);
{color:#000080}this{color}.{color:#660e7a}clazz {color}= clazz;
}
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