在Xtext中实例化整数而不是终端规则的DefaultTerminalConverters的实现抛出了ClassCastException

import org.eclipse.xtext.conversion.IValueConverter;
import org.eclipse.xtext.conversion.impl.AbstractLexerBasedConverter;
import org.eclipse.xtext.conversion.impl.INTValueConverter;
import org.eclipse.xtext.nodemodel.INode;
import org.eclipse.xtext.util.Strings;

public class CustomIntegerValueConverter extends AbstractLexerBasedConverter<Integer> {

    private INTValueConverter intConverter = new INTValueConverter();

    @Override
    protected IValueConverter<Integer> getLexerConverter() {
        return intConverter;
    }

    @Override
    public Integer toValue(String string, INode node) {
        if (Strings.isEmpty(string))
            throw new ValueConverterException("Empty input", node, null);

        try {
            // Instantiate Integer directly from the input string
            return Integer.valueOf(string);
        } catch (NumberFormatException e) {
            throw new ValueConverterException("Couldn't convert '" + string + "' to Integer", node, e);
        }
    }
}

terminal INTEGER returns ecore::EInt:
    ('0'..'9')+;

// ...

MyRule:
    'my' value=INTEGER;