@Nullable
  protected JavaLineBreakpointType getXBreakpointType() {
    XBreakpointType<?, P> type = myXBreakpoint.getType();
    // Nashorn breakpoints do not contain JavaLineBreakpointType
    if (type instanceof JavaLineBreakpointType) {
      return (JavaLineBreakpointType)type;
    }
    return null;
  }
@Nullable
  protected JavaLineBreakpointType getXBreakpointType()