Form Builder cannot search Chinese character

   For the Bookshelf Forms Demo, I insert a Chinese book with Chinese character. It's OK. I can see it in the list. But when I do the search for the book, I get no data found, and an error occurs.

ERROR XFormsServer  -                   xforms-submit-error - setting throwable {throwable: "java.lang.IllegalArgumentException: Invalid uri 'http://orbeon:orbeon@localhost:8680/exist/rest/db/orbeon/fr/orbeon/bookshelf/data/?page-size=3&page-number=1&query=&path=details%2Ftitle&value=王&sort-key=&lang=en': Invalid query

How can I do the search?

thanks&regards

Lex