coderzSSS opened a new issue #8741:
URL: https://github.com/apache/dubbo/issues/8741
### Environment
* Dubbo version: 3.0.2.1
* Operating System version: Linux 4.14.152-127.182.amzn2.x86_64
* Java version: 1.8_310
### Steps to reproduce this issue
1. A provider annotated with @DubboService(tag = 'XXX')
2. A Consumer annotated with @DubboReference(tag = 'XXX')
3. Consumer will complain no provider found
Possible Cause:
1. TagDynamicStateRouter#line 112 will hardcode tag as 'noTag' even the
service has a valid tag but without tagRouterRule set
```
invocation.setAttachment(TAG_KEY, NO_TAG);
```
2. TagStaticStateRouter#64 try to locate the tag with below code, however
the tag attachment already set as noTag from previous router, hence the tag is
always noTag even the url has a valid tag set.
```
String tag = StringUtils.isEmpty(invocation.getAttachment(TAG_KEY)) ?
url.getParameter(TAG_KEY) :
invocation.getAttachment(TAG_KEY);
if (StringUtils.isEmpty(tag)) {
tag = NO_TAG;
}
```
Possible Fix:
replace StringUtils.isEmpty as below function:
```
boolean isNoTag(String value) {
return StringUtils.isEmpty(value) || NO_TAG.equals(value));
}
```
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