org.springframework.data.mapping.MappingException: Map key bankInfo.cardNo contains dots but no replacement was configured! Make sure map keys don't contain dots in the first place or configure an appropriate replacement!at org.springframework.data.mongodb.core.convert.MappingMongoConverter.potentiallyEscapeMapKey(MappingMongoConverter.java:780)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.prepareMapKey(MappingMongoConverter.java:762)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeMapInternal(MappingMongoConverter.java:729)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createMap(MappingMongoConverter.java:651)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:540)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:508)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:484)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:458)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeCollectionInternal(MappingMongoConverter.java:704)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createCollection(MappingMongoConverter.java:620)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:534)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:508)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:484)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:458)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeMapInternal(MappingMongoConverter.java:739)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createMap(MappingMongoConverter.java:651)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:540)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:508)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:484)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:458)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:402)at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:79)at org.springframework.data.mongodb.core.MongoTemplate.toDocument(MongoTemplate.java:1071)at org.springframework.data.mongodb.core.MongoTemplate.doInsert(MongoTemplate.java:1049)at org.springframework.data.mongodb.core.MongoTemplate.insert(MongoTemplate.java:989)at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.insert(SimpleMongoRepository.java:247)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)

@Bean  
public MappingMongoConverter mappingMongoConverter(MongoDbFactory mongoDbFactory, MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> mappingContext) throws Exception {  DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);  MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mappingContext);  converter.setMapKeyDotReplacement("_");  converter.afterPropertiesSet();  return converter;  
}