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com.fasterxml.jackson.databind.JsonMappingException: [no message for java.lang.NullPointerException]	at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:129)	at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:2718)	at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsBytes(ObjectMapper.java:2233)	at org.ektorp.PageRequest.asLink(PageRequest.java:114)	at org.ektorp.Page.getPreviousLink(Page.java:91)	at com.dinfo.china.mobile.util.QueryUtil.main(QueryUtil.java:106)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)