Caused by: org.springframework.beans.NullValueInNestedPathException: Invalid property 'xxxx'
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Caused by: org.springframework.beans.NullValueInNestedPathException: Invalid property 'xxx' of bean class [xxxx]: Could not instantiate property type [xxxx] to auto-grow nested property path: java.lang.InstantiationException: xxxx
这种问题是因为 你这个类中没有默认的空的构造函数，导致不能自动注入 autowired ,所以无法找到该类。
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