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org.springframework.data.mapping.model.MappingException: No mapping metadata found for class com.mongodb.BasicDBObject	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createDBRef(MappingMongoConverter.java:729)	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.toDBRef(MappingMongoConverter.java:288)	at org.springframework.data.mongodb.core.convert.QueryMapper.convertAssociation(QueryMapper.java:273)	at org.springframework.data.mongodb.core.convert.QueryMapper.getMappedKeyword(QueryMapper.java:158)	at org.springframework.data.mongodb.core.convert.QueryMapper.getMappedObject(QueryMapper.java:111)	at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1489)	at org.springframework.data.mongodb.core.MongoTemplate.doFind(MongoTemplate.java:1480)	at org.springframework.data.mongodb.core.MongoTemplate.find(MongoTemplate.java:527)	at org.springframework.data.mongodb.repository.query.AbstractMongoQuery$PagedExecution.execute(AbstractMongoQuery.java:205)	at org.springframework.data.mongodb.repository.query.AbstractMongoQuery.execute(AbstractMongoQuery.java:93)	at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:337)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)