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Java invalid characters in username

Java invalid characters in usernameJava invalid characters in usernameJava invalid characters in usernameJava invalid characters in usernameJava invalid characters in usernameJava invalid characters in username
Java invalid characters in usernameJava invalid characters in usernameJava invalid characters in usernameJava invalid characters in usernameJava invalid characters in usernameJava invalid characters in username
Java invalid characters in usernameJava invalid characters in username