URL over two pages causes nested errors

Question

I tried to generate a MWE where I can reproduce my main problem. The major error says

error:  (pdf backend): 'endlink' ended up in different nesting level than 'startlink'
!  ==> Fatal error occurred, no output PDF file produced!

Searching for solution and hints for this problem I figured out that it is related to URLs which are too long and are finally span two sides. Although the solution found works it has some other problems in the ongoing documents. The packages I've included are the ones I need for processing. We have long tables included - which not necessarily are required for a MWE. The MWE looks like:

\documentclass[a4paper,11pt]{book}
\usepackage[a4paper,includeheadfoot,margin=2.5cm,showframe]{geometry} % for margins on a A4paper
\usepackage{lipsum}  
\usepackage{hyperref} 
\def\UrlBreaks{\do\/\do-\do\_} 
\usepackage{ltablex} % for tables with long lines & long tables (over >1 page)
\usepackage{tabularx} 
\begin{document}
    \section{Introduction}
    \lipsum[1-5]
    \begin{itemize}
        %\interlinepenalty10000  % workaround ???
        \item   Die Zeit (22.9.2016): Kabul schließt Friedensabkommen mit berüchtigtem
        Milizenführer Hekmatjar, 
        \sloppy
        \url{http://www.zeit.de/news/2016-09/22/afghanistan-kabul-schliesst-friedensabkommen-mit-beruechtigtem-milizenfuehrer-hekmatjar-22113008}
        , Zugriff 5.10.2016
                \item   Die Zeit (22.9.2016): Kabul schließt Friedensabkommen mit berüchtigtem
        Milizenführer Hekmatjar, 
        \sloppy
        \url{http://www.zeit.de/news/2016-09/22/afghanistan-kabul-schliesst-friedensabkommen-mit-beruechtigtem-milizenfuehrer-hekmatjar-22113008}
        , Zugriff 5.10.2016
    \end{itemize}

    \section{New page}
    \lipsum[7-8]
%   \newpage  % workaround ???
    \begin{tabularx}{8cm}{|X|X|X|X|}
        \hline
        In dieser Tabelle & hat jede Zelle genau die & gleich Breite & nämlich gerade 
        2cm \\
        \hline
        Und wie man & dabei leicht erkennen kann & reicht diese Breite nicht bei allen
        & Spalten aus um den gesamten Text darzustellen. \\
        \hline
    \end{tabularx}
\end{document}

I see as the root cause of the problem that the URL spans two pages. If I either take care that the item is one page or if I make a new page than the problem vanishes (marked with %workaround ???).

So my main question: How to solve the URL breaking in a better way? (To avoid nested problems).

Answer 1

The problem is not really the url over two pages. Normally this works quite fine. The problem is the longtable (hidden in the tabularx, ltablex redefines tabularx to use it). longtable redefines the output routine and adds a box, and this means that the first page has a smaller box level than the second. If one adds an additional box on the first page too the error goes away:

\documentclass[a4paper,11pt]{book}
\usepackage[a4paper,includeheadfoot,margin=2.5cm,showframe]{geometry} % for margins on a A4paper
\usepackage{lipsum}
\usepackage{hyperref}
\def\UrlBreaks{\do\/\do-\do\_}
\usepackage{ltablex} % for tables with long lines & long tables (over >1 page)
\usepackage{tabularx}

\AtBeginShipout{%
  \ifnum\value{page}=1 % use e.g. zlabel/zref to get the relevant page number
    \typeout{* Additional boxing of page `\thepage'}%
    \setbox\AtBeginShipoutBox=\hbox{\copy\AtBeginShipoutBox}%
  \fi
}
\begin{document}
    \section{Introduction}
    \lipsum[1-5]
    \begin{itemize}
        %\interlinepenalty10000  % workaround ???
        \item   Die Zeit (22.9.2016): Kabul schließt Friedensabkommen mit berüchtigtem
        Milizenführer Hekmatjar,
        \sloppy
        \url{http://www.zeit.de/news/2016-09/22/afghanistan-kabul-schliesst-friedensabkommen-mit-beruechtigtem-milizenfuehrer-hekmatjar-22113008}
        , Zugriff 5.10.2016
                \item   Die Zeit (22.9.2016): Kabul schließt Friedensabkommen mit berüchtigtem
        Milizenführer Hekmatjar,
        \sloppy
        \url{http://www.zeit.de/news/2016-09/22/afghanistan-kabul-schliesst-friedensabkommen-mit-beruechtigtem-milizenfuehrer-hekmatjar-22113008}
        , Zugriff 5.10.2016
    \end{itemize}

    \section{New page}
    \lipsum[7-8]
%   \newpage  % workaround ???
    \begin{tabularx}{8cm}{|X|X|X|X|}
        \hline
        In dieser Tabelle & hat jede Zelle genau die & gleich Breite & nämlich gerade
        2cm \\
        \hline
        Und wie man & dabei leicht erkennen kann & reicht diese Breite nicht bei allen
        & Spalten aus um den gesamten Text darzustellen. \\
        \hline
    \end{tabularx}
\end{document}