can be replace is
```
public static boolean isRealBlank(CharSequence cs) {
int strLen;
if (cs != null && (strLen = cs.length()) != 0) {
for (int i = 0; i < strLen; ++i) {
if (!Character.isWhitespace(cs.charAt(i))) {
return false;
}
}
}
return true;
}
```
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/3076 ]
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