jackSon序列化枚举为字节数组抛空指针错误

jackSon序列化枚举为字节数组抛空指针异常
最近在使用jackson的时候遇到这样一个问题，jackson版本1.9.10

Java code

        ObjectMapper mapper = new ObjectMapper(new SmileFactory());        mapper.setVisibility(JsonMethod.FIELD, Visibility.ANY);        mapper.configure(SerializationConfig.Feature.USE_ANNOTATIONS, false);                mapper.setAnnotationIntrospector(new NopAnnotationIntrospector());                System.out.println(mapper.writeValueAsBytes(ViewTime.FOREVER));

调用writeValueAsBytes此方法将枚举转成字节的时候抛空指针异常，下面是异常信息
org.codehaus.jackson.map.JsonMappingException: [no message for java.lang.NullPointerException]
at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:625)
at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
at org.codehaus.jackson.map.ObjectMapper._configAndWriteValue(ObjectMapper.java:2575)
at org.codehaus.jackson.map.ObjectMapper.writeValueAsBytes(ObjectMapper.java:2114)
at com.myproduct.mobileinternet.cmsinterface.pojo.Configure.main(Configure.java:61)
Caused by: java.lang.NullPointerException
at org.codehaus.jackson.smile.SmileGenerator.writeString(SmileGenerator.java:996)
at org.codehaus.jackson.map.ser.std.EnumSerializer.serialize(EnumSerializer.java:59)
at org.codehaus.jackson.map.ser.std.EnumSerializer.serialize(EnumSerializer.java:24)
at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
... 4 more
只要注掉
mapper.configure(SerializationConfig.Feature.USE_ANNOTATIONS, false);

mapper.setAnnotationIntrospector(new NopAnnotationIntrospector());
这两行就不会出现此问题，求大神指点这是什么情况。

Java code

public enum ViewTime{    FOREVER(-1), SEVEN_DAY(0), ONE_MONTH(1),TWO_MONTH(2),THREE_MONTH(3),SIX_MONTH(4),ONE_YEAR(5);        private int value;    private ViewTime(int value)    {        this.value = value;    }    public int getValue()    {        return value;    }        public static ViewTime fromValue(int period)    {        switch(period)        {        case -1:            return FOREVER;        case 0:            return SEVEN_DAY;        case 1:            return ONE_MONTH;        case 2:            return TWO_MONTH;        case 3:            return THREE_MONTH;        case 4:            return SIX_MONTH;        case 5:            return ONE_YEAR;        }        return null;    }    @Override    public String toString()    {        return String.valueOf(value);    }}

------解决方案--------------------------------------------------------
jason解析配置问题，帮顶