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Type: Task
Resolution: Done
Priority: Major - P3
Fix Version/s: None
Affects Version/s: 3.8.1
Component/s: Async, Query Operations
Labels:
None
Environment:
Ubuntu Linux operating system.

Confidence Status:
None

Aha! Reference:
None
Tracking Level:
None
Risk Status:
None
Exec Notes:
None
Goal Link:
None
Goal Name(s):
None

I am retrieving the documents from the MongoDB with the collection.find().into() to generate the documents. The following is the code -

List<Document> scrapingInformation = new LinkedList<>();
database.getCollection(scrapingInformationByClientidJobid)
 .find(and(eq("clientId", clientId), eq("jobId", jobId)))
 .into(scrapingInformation, (res, ex) ->
{ 
    ex.printStackTrace(); System.out.println("Exception while iterating over the finditerable and adding to document list: " + ex.getMessage()); }
);
System.out.println("Total populated documents in list: " + scrapingInformation.size());{{ }}

Data is there in the database. The find() method reads that data as well. The problem comes when I try to iterate on the data. I tried iterating over the FindIterable as well. There was also the NullPointerException.

The version I installed is 4.0 and driver 3.8.1. To remove the possibility of version conflict I downgraded to 3.6.1 and still, there is the problem.

Following is the stacktrace:

java.lang.NullPointerException
	at com.fastscraping.dao.mongo.ScrapingInformationDB.lambda$getScrapingInformation$2(ScrapingInformationDB.java:71)
	at com.mongodb.async.client.MongoIterableImpl$2$2.onResult(MongoIterableImpl.java:110)
	at com.mongodb.async.client.MongoIterableImpl$2$2.onResult(MongoIterableImpl.java:104)
	at com.mongodb.async.client.MongoIterableImpl$4.onResult(MongoIterableImpl.java:171)
	at com.mongodb.async.client.MongoIterableImpl$4.onResult(MongoIterableImpl.java:166)
	at com.mongodb.operation.AsyncQueryBatchCursor.next(AsyncQueryBatchCursor.java:141)
	at com.mongodb.operation.AsyncQueryBatchCursor.next(AsyncQueryBatchCursor.java:100)
	at com.mongodb.async.client.MongoIterableImpl.loopCursor(MongoIterableImpl.java:166)
	at com.mongodb.async.client.MongoIterableImpl.access$000(MongoIterableImpl.java:34)
	at com.mongodb.async.client.MongoIterableImpl$4.onResult(MongoIterableImpl.java:177)
	at com.mongodb.async.client.MongoIterableImpl$4.onResult(MongoIterableImpl.java:166)
	at com.mongodb.operation.AsyncQueryBatchCursor.next(AsyncQueryBatchCursor.java:136)
	at com.mongodb.operation.AsyncQueryBatchCursor.next(AsyncQueryBatchCursor.java:100)
	at com.mongodb.async.client.MongoIterableImpl.loopCursor(MongoIterableImpl.java:166)
	at com.mongodb.async.client.MongoIterableImpl.access$000(MongoIterableImpl.java:34)
	at com.mongodb.async.client.MongoIterableImpl$2.onResult(MongoIterableImpl.java:99)
	at com.mongodb.async.client.MongoIterableImpl$2.onResult(MongoIterableImpl.java:93)
	at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
	at com.mongodb.async.client.OperationExecutorImpl$1$1.onResult(OperationExecutorImpl.java:82)
	at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
	at com.mongodb.operation.FindOperation$3.onResult(FindOperation.java:806)
	at com.mongodb.operation.OperationHelper$ReferenceCountedReleasingWrappedCallback.onResult(OperationHelper.java:364)
	at com.mongodb.operation.CommandOperationHelper$2.onResult(CommandOperationHelper.java:405)
	at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
	at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor$2.onResult(DefaultServer.java:227)
	at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
	at com.mongodb.internal.connection.CommandProtocolImpl$1.onResult(CommandProtocolImpl.java:85)
	at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection$1.onResult(DefaultConnectionPool.java:461)
	at com.mongodb.internal.connection.UsageTrackingInternalConnection$2.onResult(UsageTrackingInternalConnection.java:111)
	at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:49)
	at com.mongodb.internal.connection.InternalStreamConnection$2$1.onResult(InternalStreamConnection.java:379)
	at com.mongodb.internal.connection.InternalStreamConnection$2$1.onResult(InternalStreamConnection.java:356)
	at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback$MessageCallback.onResult(InternalStreamConnection.java:651)
	at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback$MessageCallback.onResult(InternalStreamConnection.java:618)
	at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:494)
	at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:491)
	at com.mongodb.connection.netty.NettyStream.readAsync(NettyStream.java:236)
	at com.mongodb.internal.connection.InternalStreamConnection.readAsync(InternalStreamConnection.java:491)
	at com.mongodb.internal.connection.InternalStreamConnection.access$1000(InternalStreamConnection.java:74)
	at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback.onResult(InternalStreamConnection.java:608)
	at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback.onResult(InternalStreamConnection.java:593)
	at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:494)
	at com.mongodb.internal.connection.InternalStreamConnection$5.completed(InternalStreamConnection.java:491)
	at com.mongodb.connection.netty.NettyStream.readAsync(NettyStream.java:236)
	at com.mongodb.connection.netty.NettyStream.handleReadResponse(NettyStream.java:266)
	at com.mongodb.connection.netty.NettyStream.access$600(NettyStream.java:66)
	at com.mongodb.connection.netty.NettyStream$InboundBufferHandler.channelRead0(NettyStream.java:325)
	at com.mongodb.connection.netty.NettyStream$InboundBufferHandler.channelRead0(NettyStream.java:322)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349)
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:341)
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349)
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926)
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:129)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:642)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:565)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:479)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:441)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
	at java.lang.Thread.run(Thread.java:748)

What could be the cause of this exception?

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