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ConcurrentModificationException when working with measurements #1444

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@petebankhead
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Reopening this as it's very similar and still happening in QuPath 0.5.0
A user had an annotation inside which there was another annotation filled with detections (over 5000)
When runing "Delaunay cluster features 2D" we ran into

Error running plugin: java.util.ConcurrentModificationException
java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
at java.base/java.util.concurrent.FutureTask.report(Unknown Source)
at java.base/java.util.concurrent.FutureTask.get(Unknown Source)
at qupath.lib.plugins.AbstractTaskRunner.awaitCompletion(AbstractTaskRunner.java:147)
at qupath.lib.plugins.AbstractTaskRunner.runTasks(AbstractTaskRunner.java:117)
at qupath.lib.gui.TaskRunnerFX.runTasks(TaskRunnerFX.java:106)
at qupath.lib.plugins.AbstractPlugin.runPlugin(AbstractPlugin.java:147)
at qupath.lib.gui.ParameterDialogWrapper$1.run(ParameterDialogWrapper.java:177)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.util.ConcurrentModificationException
at java.base/java.util.ArrayList.checkForComodification(Unknown Source)
at java.base/java.util.ArrayList.equals(Unknown Source)
at java.base/java.util.WeakHashMap.matchesKey(Unknown Source)
at java.base/java.util.WeakHashMap.get(Unknown Source)
at java.base/java.util.Collections$SynchronizedMap.get(Unknown Source)
at qupath.lib.measurements.NumericMeasurementList$AbstractNumericMeasurementList.getNameMap(NumericMeasurementList.java:142)
at qupath.lib.measurements.NumericMeasurementList$AbstractNumericMeasurementList.close(NumericMeasurementList.java:133)
at qupath.lib.measurements.NumericMeasurementList$FloatList.close(NumericMeasurementList.java:352)
at qupath.opencv.features.DelaunayTriangulation.addClusterMeasurements(DelaunayTriangulation.java:466)
at qupath.opencv.features.DelaunayClusteringPlugin$DelaunayRunnable.run(DelaunayClusteringPlugin.java:215)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

I can ask them to share a QuPath project if it's useful to you.

The issue appeared on a built from source linux QuPath if that's of any use.

All the best and happy new year

Originally posted by @lacan in #1182 (comment)

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