ANTLR 4: Avoid error printing to console

You can check what listeners you have

for (ANTLRErrorListener listener : parser.getErrorListeners()) {
        System.out.println(listener);
}

Look for ConsoleErrorListener.

By default, ConsoleListener is activated [1].

You can remove it in your code:

lexer.removeErrorListener(ConsoleErrorListener.INSTANCE);

[1] https://github.com/antlr/antlr4/blob/master/runtime/Java/src/org/antlr/v4/runtime/Recognizer.java#L56 (see add(ConsoleErrorListener.INSTANCE);)

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