Fully Expanded Arguments to Config WeightRoutePredicate always occur empty error

[sunhao1256]

Describe the bug
Fully Expanded Arguments for WeightRoutePredicate always occur empty error in startup procedure

Sample
spring-cloud-starter-gateway:4.0.7

  cloud:
    gateway:
      routes:
        - id: weight_high
          uri: http://localhost:8001
          predicates:
            - Path=/weight
            - Weight=/
            - name: Cookie
              args:
                name: mycookie
                regexp: mycookievalue
            - name: Weight
              args:
                weight: 8
                group: 'group1'

error msg:

   - Field error in object 'weight' on field 'group': rejected value [null]; codes [NotEmpty.weight.group,NotEmpty.group,NotEmpty.java.lang.String,NotEmpty]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [weight.group,group]; arguments []; default message [group]]; default message [不能为空]
    at org.springframework.boot.context.properties.bind.validation.ValidationBindHandler.validateAndPush(ValidationBindHandler.java:141)
    at org.springframework.boot.context.properties.bind.validation.ValidationBindHandler.validate(ValidationBindHandler.java:114)
    at org.springframework.boot.context.properties.bind.validation.ValidationBindHandler.onFinish(ValidationBindHandler.java:105)
    at org.springframework.boot.context.properties.bind.Binder.handleBindResult(Binder.java:368)
    at org.springframework.boot.context.properties.bind.Binder.bind(Binder.java:349)
    ... 59 common frames omitted
2024-12-13 17:50:28.863 ERROR [/] [-main-] c.a.g.l.RefreshRoutesResultEventListener : refresh routes error org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'weight' to org.springframework.cloud.gateway.support.WeightConfig
2024-12-13 17:50:34.006  INFO [/] [-main-] .s.b.a.l.ConditionEvaluationReportLogger : 

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2024-12-13 17:50:34.063 ERROR [/] [-main-] o.s.b.d.LoggingFailureAnalysisReporter : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Binding to target org.springframework.boot.context.properties.bind.BindException: Failed to bind properties under 'weight' to org.springframework.cloud.gateway.support.WeightConfig failed:

    Property: weight.group
    Value: "null"
    Reason: 不能为空


Action:

Update your application's configuration```