问题在java中修剪日语字符串

I have the following string (japanese) "　ユーザー名" , the first character is "like" whitespace but its number in unicode is 12288, so if I do "　ユーザー名".trim() I get the same string (trim doesn't work). If i do trim in c++ it works ok. Does anyone know how to solve this issue in java? Is there a special trim method for unicode?I have the following string (japanese) "　ユーザー名"