This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Java is Unicode compliant; you ought not to have any problems with any sort of characters. Please always post the actual code so we can see what it is. You might in fact have a completely different compiler error.
What sort of comment is it? Does it start with /*? If so, any */ anywhere in the comment will convert the rest of the comment to what the compiler sees as nonsense.