[BUG] Inconsistency in toJSONString for Enum

[Cooper-Zhong]

问题描述

fastjson 和 fastjson2 对Enum使用toJSONString 不一致

环境信息

请填写以下信息：

• OS信息： [e.g.：MacOS 12.7.4 M1 Pro 16 GB]
• JDK信息： [e.g.：Openjdk 17.0.6]
• 版本信息：[e.g.：Fastjson 2.0.49]

重现步骤

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.annotation.JSONField;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

public class Issue972Mutated_141 {
    public enum Type {
        @JSONField(name = "Rejected")
        REJECTED,

        @JSONField(name = "Pending")
        PENDING,
    }

    public static class Bean {
        public Type type;
    }

    public enum Type1 {
        @com.alibaba.fastjson.annotation.JSONField(name = "Rejected")
        REJECTED,

        @com.alibaba.fastjson.annotation.JSONField(name = "Pending")
        PENDING,
    }

    public static class Bean1 {
        public Type1 type;
    }

    @Test
    public void testMutated() {
        String str = JSON.toJSONString(Type.REJECTED);
        assertEquals("\"Rejected\"", str);
    }

    @Test
    public void testMutatedfj() {
        String str = com.alibaba.fastjson.JSON.toJSONString(Type1.REJECTED);
        assertEquals("\"Rejected\"", str);
    }


    @Test
    public void testMutated0() {
        Bean bean = new Bean();
        bean.type = Type.REJECTED;
        String str = JSON.toJSONString(bean, JSONWriter.Feature.WriteEnumsUsingName);
        assertEquals("{\"type\":\"Rejected\"}", str);
    }

    @Test
    public void testMutated0fj() {
        Bean1 bean1 = new Bean1();
        bean1.type = Type1.REJECTED;
        String str = com.alibaba.fastjson.JSON.toJSONString(bean1, SerializerFeature.WriteEnumUsingName);
        assertEquals("{\"type\":\"Rejected\"}", str);
    }
}

期待的正确结果

两者结果不一致

• fastjson使用了toJSONString(bean, SerializerFeature.WriteEnumUsingName);
• fastjson2使用toJSONString(bean, JSONWriter.Feature.WriteEnumsUsingName);

result:
org.opentest4j.AssertionFailedError:
Expected :"Rejected"
Actual :"REJECTED"

[wenshao]

https://oss.sonatype.org/content/repositories/snapshots/com/alibaba/fastjson/2.0.50-SNAPSHOT/
问题已修复，请帮忙用2.0.50-SNAPSHOT版本验证，2.0.50版本预计在5月12日前发布

[Cooper-Zhong]

经验证已修复，辛苦wenshao

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.50
2.0.50已发布，请用新版本