报错信息：
java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.TimSort.mergeHi(TimSort.java:899)
at java.util.TimSort.mergeAt(TimSort.java:516)
at java.util.TimSort.mergeForceCollapse(TimSort.java:457)
at java.util.TimSort.sort(TimSort.java:254)
at java.util.Arrays.sort(Arrays.java:1438)
at com.bm.fastjson.util.TypeUtils.computeGetters(TypeUtils.java:1880)
at com.bm.fastjson.util.TypeUtils.buildBeanInfo(TypeUtils.java:1820)
at com.bm.fastjson.serializer.SerializeConfig.createJavaBeanSerializer(SerializeConfig.java:113)
at com.bm.fastjson.serializer.SerializeConfig.getObjectWriter(SerializeConfig.java:821)
at com.bm.fastjson.serializer.SerializeConfig.getObjectWriter(SerializeConfig.java:440)
at com.bm.fastjson.serializer.JSONSerializer.getObjectWriter(JSONSerializer.java:448)
at com.bm.fastjson.serializer.ListSerializer.write(ListSerializer.java:128)
at com.bm.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:312)
at com.bm.fastjson.JSON.toJSONString(JSON.java:793)
at com.bm.fastjson.JSON.toJSONString(JSON.java:731)
at com.bm.fastjson.JSON.toJSONString(JSON.java:688)
问题原因：fastjson的一个bug
解决方式：升级fastjson到1.2.79版本（https://github.com/alibaba/fastjson/releases/tag/1.2.79）
