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    java.lang.NullPointerException
        at com.fasterxml.jackson.databind.SerializerProvider.getTypeFactory(SerializerProvider.java:335)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
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