QsciScintilla lexer not working

[Tissemyren]

I have this basic editor:

auto* editor = new QsciScintilla(parent);
auto* lexer = new QsciLexerJava(editor);

QFont editorFont("Consolas", 10);
editorFont.setStyleHint(QFont::Monospace);
lexer->setFont(editorFont);

QColor darkBg("#1E1E1E");
QColor defaultFg("#D4D4D4");

lexer->setDefaultPaper(darkBg);
lexer->setDefaultColor(defaultFg);
lexer->setPaper(darkBg);

lexer->setColor(QColor("#569CD6"), QsciLexerJava::Keyword);
lexer->setColor(QColor("#C586C0"), QsciLexerJava::KeywordSet2);
lexer->setColor(QColor("#B5CEA8"), QsciLexerJava::Number);
lexer->setColor(QColor("#CE9178"), QsciLexerJava::DoubleQuotedString);
lexer->setColor(QColor("#CE9178"), QsciLexerJava::SingleQuotedString);

editor->setLexer(lexer);

and for some reason, the lexer doesn't highlight the keywords, comments etc. The default colors are working as expected, so I am not sure what is causing it. There are no errors.

[Nils Sjoberg]

lexer->setPaper(darkBg);

here

lexer->setDefaultPaper(darkBg);

Use this.

[Tissemyren]

@Nils-Sjoberg Alright, changed that, but it unfortunately did not change much.