Exception in thread "main" java.lang.NullPointerException
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at org.bson.codecs.pojo.PojoCodecImpl.encodeValue(PojoCodecImpl.java:180)
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at org.bson.codecs.pojo.PojoCodecImpl.encodeProperty(PojoCodecImpl.java:168)
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at org.bson.codecs.pojo.PojoCodecImpl.encode(PojoCodecImpl.java:105)
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at org.bson.codecs.pojo.AutomaticPojoCodec.encode(AutomaticPojoCodec.java:50)
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at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:231)
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at com.mongodb.DBObjectCodec.encodeIterable(DBObjectCodec.java:291)
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at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:218)
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at com.mongodb.DBObjectCodec.encodeMap(DBObjectCodec.java:240)
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at com.mongodb.DBObjectCodec.writeValue(DBObjectCodec.java:216)
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at com.mongodb.DBObjectCodec.encode(DBObjectCodec.java:148)
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at com.mongodb.DBObjectCodec.encode(DBObjectCodec.java:64)
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at org.bson.BsonDocumentWrapper.getUnwrapped(BsonDocumentWrapper.java:195)
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at org.bson.BsonDocumentWrapper.isEmpty(BsonDocumentWrapper.java:115)
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at com.mongodb.operation.BulkWriteBatch$WriteRequestEncoder.encode(BulkWriteBatch.java:395)
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at com.mongodb.operation.BulkWriteBatch$WriteRequestEncoder.encode(BulkWriteBatch.java:377)
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at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
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at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
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at com.mongodb.internal.connection.BsonWriterHelper.writeDocument(BsonWriterHelper.java:75)
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at com.mongodb.internal.connection.BsonWriterHelper.writePayload(BsonWriterHelper.java:59)
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at com.mongodb.internal.connection.CommandMessage.encodeMessageBodyWithMetadata(CommandMessage.java:145)
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at com.mongodb.internal.connection.RequestMessage.encode(RequestMessage.java:138)
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at com.mongodb.internal.connection.CommandMessage.encode(CommandMessage.java:59)
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at com.mongodb.internal.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:244)
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at com.mongodb.internal.connection.UsageTrackingInternalConnection.sendAndReceive(UsageTrackingInternalConnection.java:99)
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at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.sendAndReceive(DefaultConnectionPool.java:444)
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at com.mongodb.internal.connection.CommandProtocolImpl.execute(CommandProtocolImpl.java:72)
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at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:200)
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at com.mongodb.internal.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:269)
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at com.mongodb.internal.connection.DefaultServerConnection.command(DefaultServerConnection.java:131)
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at com.mongodb.operation.MixedBulkWriteOperation.executeCommand(MixedBulkWriteOperation.java:433)
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at com.mongodb.operation.MixedBulkWriteOperation.executeBulkWriteBatch(MixedBulkWriteOperation.java:259)
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at com.mongodb.operation.MixedBulkWriteOperation.access$700(MixedBulkWriteOperation.java:70)
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at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:203)
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at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:194)
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at com.mongodb.operation.OperationHelper.withReleasableConnection(OperationHelper.java:424)
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at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:194)
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at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:69)
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at com.mongodb.client.internal.MongoClientDelegate$DelegateOperationExecutor.execute(MongoClientDelegate.java:193)
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at com.mongodb.client.internal.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:961)
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at com.mongodb.client.internal.MongoCollectionImpl.executeUpdate(MongoCollectionImpl.java:952)
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at com.mongodb.client.internal.MongoCollectionImpl.updateOne(MongoCollectionImpl.java:614)
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at com.mongodb.client.internal.MongoCollectionImpl.updateOne(MongoCollectionImpl.java:609)
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at com.github.raghuchandrasekaran.app.ItemListDaoImpl.updateItems(ItemListDaoImpl.java:33)
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at com.github.raghuchandrasekaran.app.Application.main(Application.java:47)
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