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  1. JDK
  2. JDK-8202307

Getting a java.lang.OutOfMemoryError: Java heap space when calling Stream.iterator().next() on a stream which uses an infinite/very big Stream in flatMap.

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      A DESCRIPTION OF THE PROBLEM :
      Getting a java.lang.OutOfMemoryError: Java heap space when calling Stream.iterator().next() on a stream which uses an infinite/very big Stream in flatMap.

      As far as I understand this is related to the bug JDK-8196106 .

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run code below

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Termination without output
      ACTUAL -
      Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
      at java.base/java.util.stream.SpinedBuffer$OfInt.newArray(SpinedBuffer.java:750)
      at java.base/java.util.stream.SpinedBuffer$OfInt.newArray(SpinedBuffer.java:723)
      at java.base/java.util.stream.SpinedBuffer$OfPrimitive.ensureCapacity(SpinedBuffer.java:508)
      at java.base/java.util.stream.SpinedBuffer$OfPrimitive.increaseCapacity(SpinedBuffer.java:516)
      at java.base/java.util.stream.SpinedBuffer$OfPrimitive.preAccept(SpinedBuffer.java:569)
      at java.base/java.util.stream.SpinedBuffer$OfInt.accept(SpinedBuffer.java:768)
      at java.base/java.util.stream.StreamSpliterators$IntWrappingSpliterator$$Lambda$3/940060004.accept(Unknown Source)
      at java.base/java.util.stream.ReferencePipeline$8$1$$Lambda$4/998351292.accept(Unknown Source)
      at java.base/java.util.stream.Streams$RangeIntSpliterator.tryAdvance(Streams.java:82)
      at java.base/java.util.stream.ReferencePipeline$8$1.accept(ReferencePipeline.java:326)
      at java.base/java.util.stream.Streams$StreamBuilderImpl.tryAdvance(Streams.java:397)
      at java.base/java.util.stream.StreamSpliterators$IntWrappingSpliterator.lambda$initPartialTraversalState$0(StreamSpliterators.java:347)
      at java.base/java.util.stream.StreamSpliterators$IntWrappingSpliterator$$Lambda$5/335471116.getAsBoolean(Unknown Source)
      at java.base/java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:206)
      at java.base/java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:161)
      at java.base/java.util.stream.StreamSpliterators$IntWrappingSpliterator.tryAdvance(StreamSpliterators.java:358)
      at java.base/java.util.Spliterators$2Adapter.hasNext(Spliterators.java:726)
      at java.base/java.util.Spliterators$2Adapter.nextInt(Spliterators.java:732)
      at BugReport.main(BugReport.java:18)

      ---------- BEGIN SOURCE ----------
      import java.util.function.Function;
      import java.util.stream.IntStream;
      import java.util.stream.Stream;

      public class BugReport
      {
          public static void main(String[] args)
          {
              Stream
                  .of(IntStream.range(0, Integer.MAX_VALUE))
                  .flatMapToInt(Function.identity())
                  .iterator()
                  .nextInt();
          }
      }

      ---------- END SOURCE ----------

      FREQUENCY : always


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              • Assignee:
                psandoz Paul Sandoz (Inactive)
                Reporter:
                webbuggrp Webbug Group
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                • Created:
                  Updated:
                  Resolved: