problem description

in Grid inner class Renderer.render()

try {
    _renderer.render(row, value, index);
} catch (AbstractMethodError ex) {
    final Method m = _renderer.getClass().getMethod("render",
            new Class<?>[] { Row.class, Object.class });
    m.setAccessible(true);
    m.invoke(_renderer, new Object[] { row, value });
}

RowRenderer sinature already changes to render(Row row, T data, int index)
But the exception handling code find an inconsistent method signature _renderer.getClass().getMethod("render", new Class<?>[]

);

debug info

render() signature changed.
https://www.zkoss.org/javadoc/5.0.11/zk/org/zkoss/zul/RowRenderer.html
https://www.zkoss.org/javadoc/6.0.0/zk/org/zkoss/zul/RowRenderer.html