java.util.concurrent.CompletionException: java.util.ConcurrentModificationException

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    • java.util.concurrent.CompletionException: java.util.ConcurrentModificationException at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273) at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280) at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1584) at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1574) at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) Caused by: java.util.ConcurrentModificationException at java.util.ArrayList.forEach(ArrayList.java:1252) at jp.yucchi.girlfriends_cme.GirlFriends_1.updateGirlFriend(GirlFriends_1.java:27) at jp.yucchi.girlfriends_cme.GirlFriends_CME.lambda$main$0(GirlFriends_CME.java:26)
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