Java 1.8 hashMap 并发put 的问题 java.util.HashMap$Node cannot be cast to java.util.HashMap$TreeNode
报错Caused by: java.lang.ClassCastException: java.util.HashMap$Node cannot be cast to java.util.HashMap$TreeNode at java.util.HashMap$TreeNode.moveRootToFront(HashMap.java:1835) at java.util.HashMap$TreeNode.treeify(HashMap.java:1951)
