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java.lang.StackOverflowError: null	at java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:744)	at java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:742)	at java.util.AbstractMap.hashCode(AbstractMap.java:507)	at java.util.Objects.hashCode(Objects.java:98)	at java.util.HashMap$Node.hashCode(HashMap.java:296)	at java.util.AbstractMap.hashCode(AbstractMap.java:507)	at java.util.Objects.hashCode(Objects.java:98)