use PropertyNamingStrategy's static field instead of new its subclass #186
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bypass the potential deadlock when PropertyNamingStrategy class initialization see: FasterXML/jackson-databind#2715
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jackson的PropertyNamingStrategy类存在潜在的类初始化死锁的问题。
可以直接使用PropertyNamingStrategy中定义好的strategy对象，这样修改后，总是先加载父类再加载子类，不会死锁，能绕过这个问题
参考: FasterXML/jackson-databind#2715