When PropertyValue "parameters" is [null] or [EMPTY], return to HashMap that can be modified

[YAGAMIL]

1. org.apache.dubbo.config.spring.util.DubboAnnotationUtils.convertParameters
   When the put target is an empty String array, the empty HashMap instead of java.util.Collections.EmptyMap supports subsequent scalable put operations org.apache.dubbo.config.spring.util.DubboAnnotationUtils#convertParameters中当参数列表未空时，直接返回了不可修改的Collections.emptyMap()，我认为不合适 #12350

What is the purpose of the change

So that @DubbboService#parameter, even if empty, does not affect the extra put operation causing the program to throw an exception

  if (ArrayUtils.isEmpty(parameters)) {
       return Collections.emptyMap();
   }

---->

  if (ArrayUtils.isEmpty(parameters)) {
       return new HashMap<>();
  }

Collections.emptyMap()is a special implementation of EmptyMap inside Collections that doesn't support change, so I don't think it makes any sense to set a Map of that type here

    public V put(K key, V value) {
        throw new UnsupportedOperationException();
    }

2. org.apache.dubbo.config.AbstractMethodConfig#getParameters

Prevents this function from returning null

    public Map<String, String> getParameters() {
        return parameters;
    }

---->

    public Map<String, String> getParameters() {
        this.parameters = Optional.ofNullable(this.parameters).orElseGet(HashMap::new);
        return this.parameters;
    }

Verifying this change

......

[AlbumenJ]

BTW, pls replace the PR subject as a considerable one and comment in English.

[AlbumenJ]

Please do not use comma import

[AlbumenJ]

Null return in org.apache.dubbo.config.AbstractMethodConfig#getParameters is also need to be considered

[AlbumenJ]

Set the newly created map to this.

[sonarqubecloud]

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