DefaultDataContainer.entrySet().stream().toArray(Object[]::new) may fail ------------------------------------------------------------------------ Key: ISPN-7656 URL: https://issues.jboss.org/browse/ISPN-7656 Project: Infinispan Issue Type: Bug Components: Core Reporter: Radim Vansa Assignee: William Burns Fix For: 9.0.0.Final When the default Spliterator estimates size of the array, it calls {{DefaultDataContainer.EntrySet#size()}} that returns directly the size of container (including expired entries). Then the container is iterated using {{ImmutableEntryIterator}} which excludes expired entries by default, and this may return less elements than the original size() provided. That causes failure like this: {code} java.lang.IllegalStateException: End size 1 is less than fixed size 2 at java.util.stream.Nodes$FixedNodeBuilder.end(Nodes.java:1232) at java.util.stream.Sink$ChainedReference.end(Sink.java:258) at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482) at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545) at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260) at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438) {code} Note that this can also happen without expiration upon concurrent modification. We have to adjust the characteristics (remove {{#SIZED}}) of provided spliterators.