java.lang.NullPointerException: This exception has no message.
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java.lang.NullPointerException:
at org.springframework.data.document.mongodb.convert.AbstractMongoConverter.maybeConvertObject(AbstractMongoConverter.java:217)
at org.springframework.data.document.mongodb.MongoTemplate.execute(MongoTemplate.java:363)
at org.springframework.data.document.mongodb.MongoTemplate.doUpdate(MongoTemplate.java:954)
at org.springframework.data.document.mongodb.MongoTemplate.updateMulti(MongoTemplate.java:947)