[BUG] fastjson2.0.65版本使用JSONB报错，Cannot invoke "java.lang.Enum.ordinal()" because "e" is null

[binaryworms]

问题描述

fastjson 2.0.65版本，使用JSONB序列化报错。
异常堆栈信息：

Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.Enum.ordinal()" because "e" is null
        at com.alibaba.fastjson2.JSONB$IO.writeEnum(JSONB.java:2196) ~[fastjson2-2.0.65.jar:?]
        at com.alibaba.fastjson2.writer.OWG_10_5_ResultValue.writeJSONB(Unknown Source) ~[?:?]
        at com.alibaba.fastjson2.JSONB.toBytes(JSONB.java:1836) ~[fastjson2-2.0.65.jar:?]
        at com.yuanian.infrastructure.cache.service.EpochFastJson2WithZipRedisSerializer.serialize(EpochFastJson2WithZipRedisSerializer.java:39) ~[com.yuanian.infrastructure.cache-ECS2.2.20260730.01.02.jar:?]

EpochFastJson2WithZipRedisSerializer.java:39行的代码信息：

byte[] bytes = JSONB.toBytes(t, JSONWriter.Feature.WriteClassName);

本人临时解决办法：
JSONB.java文件2190行左右修改后的内容：

        /**
         * Writes an enum value to a byte array
         *
         * @param bytes the byte array to write to
         * @param off the offset in the byte array
         * @param e the enum value to write
         * @param features the features to apply
         * @return the new offset
         */
        static int writeEnum(byte[] bytes, int off, Enum e, long features) {
            if (e == null) {
                // JSONB null 
                bytes[off] = BC_NULL;
                return off + 1;
            }
            if ((features & (MASK_WRITE_ENUM_USING_TO_STRING | MASK_WRITE_ENUMS_USING_NAME)) != 0) {
                return writeString(bytes, off,
                        (features & WriteEnumUsingToString.mask) != 0
                                ? e.toString()
                                : e.name()
                );
            } else {
                return JSONB.IO.writeInt32(bytes, off, e.ordinal());
            }
        }

所增加的代码

            if (e == null) {
                // JSONB null 
                bytes[off] = BC_NULL;
                return off + 1;
            }

环境信息

请填写以下信息：

• OS信息： [windows10 & CentOS 7]
• JDK信息： [Openjdk 17]
• 版本信息：[Fastjson2 2.0.65]

问题总结

本人水平有限，如上解决方案不确定是否会导致其它问题，望官方知悉bug并解决。