java.lang.UnsupportedOperationException: Not a resource method.

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java.lang.UnsupportedOperationException: Not a resource method.
at com.sun.proxy.$Proxy60.hashCode(Unknown Source)
at java.util.concurrent.ConcurrentHashMap.replaceNode(ConcurrentHashMap.java:1106)
at java.util.concurrent.ConcurrentHashMap.remove(ConcurrentHashMap.java:1097)

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