String lexer with ANTLR4

I define some String tokens like this in ANTLR4, with some exceptions surely properly handled in Java:

STRINGLIT: '"'('\\'[bfrnt\\"]|~[\n"EOF])*'"';

ILLEGAL_ESC: '"'(('\\'[bfrnt\\"]|~[\n\\"EOF]))*('\\'(~[bfrnt\\"]|EOF))
    {if (true) throw new bkool.parser.IllegalEscape(getText());};

UNCLOSED_STRING: '"'('\\'[bfrnt\\"]|[\n\\"EOF])*
    {if (true) throw new bkool.parser.UncloseString(getText());};

Then I tested with some cases, with:

"This is a string"
"String with legal escape \\"
"Legal \\n"
"Illegal \"
"Illegal \n"

No exceptions are thrown. Then with some other cases:

"This is a string
"String with legal escape \\"
"Legal \\n"
"Illegal \"
"Illegal \n"

Then it ends up with:

Unclosed string: "

The exceptions are handled by printing the respective improper string with the name of exception

I have been struggling with them for a day and now I'm stuck with it. What is still not okay with my ANTLR definitions?

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