remove _class columan from mongodb

 https://walkingtechie.blogspot.com/2018/07/spring-boot-remove-class-field-from-mongodb-document.html

AppMongoConfig.java

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package com.walking.techie.config;   import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.data.mongodb.MongoDbFactory; import org.springframework.data.mongodb.core.convert.DbRefResolver; import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver; import org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper; import org.springframework.data.mongodb.core.convert.MappingMongoConverter; import org.springframework.data.mongodb.core.mapping.MongoMappingContext;   @Configuration public class AppMongoConfig {   @Autowired private MongoDbFactory mongoDbFactory;     @Autowired private MongoMappingContext mongoMappingContext;     @Bean   public MappingMongoConverter mappingMongoConverter() {       DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);     MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);     converter.setTypeMapper(new DefaultMongoTypeMapper(null));       return converter;   } }