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org.ektorp.DbAccessException: com.fasterxml.jackson.databind.JsonMappingException: [no message for java.lang.NullPointerException] at org.ektorp.util.Exceptions.propagate(Exceptions.java:19) at org.ektorp.PageRequest.asLink(PageRequest.java:117) 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)Caused by: 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) ... 7 more