I have been able to track down the solution to somehow overriding
expectAnyFormat in VisitorFormatWrapperImpl.java but have no clue how to do
that. Is there someway I can extend that?
On Tuesday, October 22, 2019 at 8:14:18 PM UTC+5:30, Amit Singh wrote:
>
> I was trying to modify how ObjectId is serialized by the Jackson Avro
> library. Default serializer creates an AVRO having following structure :
>
> {
> "name" : "id",
> "type" : [ "null", {
> "type" : "record",
> "name" : "ObjectId",
> "namespace" : "org.bson.types",
> "fields" : [ {
> "name" : "counter",
> "type" : {
> "type" : "int",
> "java-class" : "java.lang.Integer"
> }
> }, {
> "name" : "date",
> "type" : [ "null", {
> "type" : "long",
> "java-class" : "java.util.Date"
> } ]
> }, {
> "name" : "machineIdentifier",
> "type" : {
> "type" : "int",
> "java-class" : "java.lang.Integer"
> }
> }, {
> "name" : "processIdentifier",
> "type" : {
> "type" : "int",
> "java-class" : "java.lang.Short"
> }
> }, {
> "name" : "time",
> "type" : {
> "type" : "long",
> "java-class" : "java.lang.Long"
> }
> }, {
> "name" : "timeSecond",
> "type" : {
> "type" : "int",
> "java-class" : "java.lang.Integer"
> }
> }, {
> "name" : "timestamp",
> "type" : {
> "type" : "int",
> "java-class" : "java.lang.Integer"
> }
> } ]
> } ]
> }
>
> However, MongoDB has following format for ObjectId as per official source
> <https://github.com/mongodb/specifications/blob/master/source/extended-json.rst#conversion-table>
>
> :
>
> {"$oid": <ObjectId bytes as 24-character, big-endian
> *hexstring*>}
>
> So ideally, the AVRO, that I want to generate for this, should have the
> following structure :
>
> {
> "name" : "oid",
> "type" : {
> "type" : "string"
> }
> }]
> }
>
> What I have been able to do so far is to extend the SerializerModifier and
> use changeProperties to remove all the fields generated by the ObjectId by
> first comparing the class. However, using this approach, I am not able to
> create my own property to add to the List<BeanPropertyWriter> which later
> gets serialized.
>
> public class ObjectIdSerializerModifier extends BeanSerializerModifier {
>
> @Override
> public List<BeanPropertyWriter> changeProperties(SerializationConfig
> config, BeanDescription beanDesc, List<BeanPropertyWriter> beanProperties) {
> if ( beanDesc.getBeanClass().equals(ObjectId.class) ) {
> beanProperties.clear(); // I need to add the 'oid' string element
> here.
> }
> return beanProperties;
> }
> }
>
>
> The above code piece fails with the following error :
>
> com.fasterxml.jackson.databind.exc.InvalidDefinitionException: "Any" type
> (usually for `java.lang.Object`) not supported: `expectAnyFormat` called
> with type [simple type, class org.bson.types.ObjectId]
> at
> com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
> at
> com.fasterxml.jackson.dataformat.avro.schema.VisitorFormatWrapperImpl.expectAnyFormat(VisitorFormatWrapperImpl.java:174)
> at
> com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.acceptJsonFormatVisitor(UnknownSerializer.java:66)
> at
> com.fasterxml.jackson.dataformat.avro.schema.RecordVisitor.schemaFieldForWriter(RecordVisitor.java:178)
> at
> com.fasterxml.jackson.dataformat.avro.schema.RecordVisitor.optionalProperty(RecordVisitor.java:121)
> at
> com.fasterxml.jackson.databind.ser.BeanPropertyWriter.depositSchemaProperty(BeanPropertyWriter.java:839)
> at
> com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.acceptJsonFormatVisitor(BeanSerializerBase.java:863)
> at
> com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.acceptJsonFormatVisitor(DefaultSerializerProvider.java:566)
> at
> com.fasterxml.jackson.databind.ObjectMapper.acceptJsonFormatVisitor(ObjectMapper.java:4046)
> at
> com.fasterxml.jackson.databind.ObjectMapper.acceptJsonFormatVisitor(ObjectMapper.java:4025)
> at com.amitds1997.avroserializer.Main.main(Main.java:55)
>
> This is probably because I have emptied the List and it no longer contains
> any elements. So how can I do this? Also, is this the right approach to
> take or should I modify some other parameters and functions?
>
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