[BUG] 父类Kotlin子类Java，序列化出现java.lang.ArrayIndexOutOfBoundsException: length=0; index=0

[magic-zagan]

问题描述

父类为Kotlin定义的基类，Java语言的子类继承于这个Kotlin语言定义的父类，在序列化时出现ArrayIndexOutOfBoundsException错误

环境信息

请填写以下信息：

• OS信息：Win10 16G
• JDK信息： JDK1.8
• 版本信息：Fastjson2 2.0.26

重现步骤

父类为Kotlin语言定义为：

@NoArg
public open class ProIdRpcReq(
    @field:ApiModelProperty(value = "ID", example = "1", required = true)
    var id: Long
) : ProRpcReq()

子类为Java语言定义为：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class VerifyImageCaptchaRpcReq extends ProIdRpcReq {

    @Length(min = 4, max = 6)
    @Schema(description = "验证码内容", required = true)
    private String captcha;

}

测试代码为：

        val req = VerifyImageCaptchaRpcReq()
        req.id = 1L
        req.captcha = "TEST"
        Logger.d(JSON.toJSONString(req))

期待的正确结果

期望能够正确进行序列化

相关日志输出

java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
        at com.alibaba.fastjson2.writer.ObjectWriterBaseModule$WriterAnnotationProcessor.getFieldInfo(ObjectWriterBaseModule.java:840)
        at com.alibaba.fastjson2.writer.ObjectWriterBaseModule$WriterAnnotationProcessor.getFieldInfo(ObjectWriterBaseModule.java:791)
        at com.alibaba.fastjson2.writer.ObjectWriterProvider.getFieldInfo(ObjectWriterProvider.java:208)
        at com.alibaba.fastjson2.writer.ObjectWriterCreator.lambda$createObjectWriter$2$com-alibaba-fastjson2-writer-ObjectWriterCreator(ObjectWriterCreator.java:387)
        at com.alibaba.fastjson2.writer.ObjectWriterCreator$$ExternalSyntheticLambda2.accept(Unknown Source:17)
        at com.alibaba.fastjson2.util.BeanUtils.getters(BeanUtils.java:1010)
        at com.alibaba.fastjson2.writer.ObjectWriterCreator.createObjectWriter(ObjectWriterCreator.java:383)
        at com.alibaba.fastjson2.writer.ObjectWriterProvider.getObjectWriter(ObjectWriterProvider.java:333)
        at com.alibaba.fastjson2.JSON.toJSONString(JSON.java:2311)
        at cloud.fastdev.and.module.ar.account.ui.fragment.LoginFragment.initData(LoginFragment.kt:233)

附加信息

Kotlin使用@noarg开启了为Java生成空构造方法的特性（但猜测应该没有关系）

根据DEBUG，具体崩溃的点位于：
com.alibaba.fastjson2.writer.ObjectWriterBaseModule的840行的 beanInfo.creatorConstructor.getParameterAnnotations()[i];

if (beanInfo.kotlin && beanInfo.creatorConstructor != null && beanInfo.createParameterNames != null) {
                String fieldName = BeanUtils.getterName(method, null);
                for (int i = 0; i < beanInfo.createParameterNames.length; i++) {
                    if (fieldName.equals(beanInfo.createParameterNames[i])) {
                        // ↓ 这里
                        Annotation[] parameterAnnotations = beanInfo.creatorConstructor.getParameterAnnotations()[i];
                        processAnnotations(fieldInfo, parameterAnnotations);
                        break;
                    }
                }
            }

[wenshao]

https://oss.sonatype.org/content/repositories/snapshots/com/alibaba/fastjson2/fastjson2/2.0.27-SNAPSHOT/
问题已修复，请帮忙用2.0.27-SNAPSHOT版本验证

[magic-zagan]

已在测试demo和项目中测试通过，COOL~！

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.27
请用新版本