When I try to fetch record with
{"name":undefined}
I get following exception.
org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type org.bson.BsonUndefined to type java.lang.String
at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:313) ~[spring-core-4.1.7.RELEASE.jar:4.1.7.RELEASE]
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:195) ~[spring-core-4.1.7.RELEASE.jar:4.1.7.RELEASE]
at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:176) ~[spring-core-4.1.7.RELEASE.jar:4.1.7.RELEASE]
at org.springframework.data.mongodb.core.convert.MappingMongoConverter.getPotentiallyConvertedSimpleRead(MappingMongoConverter.java:821) ~[spring-data-mongodb-1.7.1.RELEASE.jar:?]
How to solve this? I have multiple types which needs to be converted from BsonUndefined like String, Date, PhoneNumber, etc...
Answers
We ran into this issue recently, so I'm putting the results of my research here in case someone else has this issue as well.
This is a known error in Spring Data MongoDB:
https://jira.spring.io/browse/DATAMONGO-1439
The workaround from that link is to add an explicit converter for converting from BsonUndefined to null. For example, using Java 8:
@ReadingConverter
public class BsonUndefinedToNullObjectConverterFactory implements ConverterFactory<BsonUndefined, Object> {
@Override
public <T extends Object> Converter<BsonUndefined, T> getConverter(Class<T> targetType) {
return o -> null;
Without the Lambda (pre-Java 8):
@ReadingConverter
public class BsonUndefinedToNullObjectConverterFactory implements ConverterFactory<BsonUndefined, Object> {
@Override
public <T extends Object> Converter<BsonUndefined, T> getConverter(Class<T> targetType) {
return new Converter<BsonUndefined, T>() {
@Override
public T convert(BsonUndefined source) {
return null;
