By which means are you getting the data? If it is a servlet then you can set the encoding format like below:response.setCharacterEncoding("UTF-8"); Again if you are displaying some text and see some html tags in it which should not come, then you need to add @CONTEXT='html' just after the text conte...

May be you can try writing a custom workflow to rename the asset with limited number of characters from the asset or any other name that you want.

Debug the code inside TextModel class. It must be getting stuck somewhere due to some error, might be some unexpected value which is being injected and the code is failing to handle that.