Avoid Underfull \vbox and \hbox in longtable?

Question

I want to use longtable (because the table contains more than one page), but I got so many error:

Underfull \hbox (badness 2005) in paragraph at lines 22--23
\TU/lmr/m/n/10 menampilkan nilai \TU/lmr/m/it/10 vari-

Overfull \hbox (56.43303pt too wide) in alignment at lines 8--27
 [] [] [] [] [] 

I have made my table smaller but nothing works. I also tried to add @{} but no luck. I tried this solution. The black overfull bar is gone, but the error still exists. Is this because latex need to force my table content to breakline ? Is this OK to have all those warning ?

This is my MWE

\documentclass{report}

\usepackage{longtable} % add table
\overfullrule=2cm % show overfull

\begin{document}

\begin{longtable}[c]{|p{1cm}|p{4cm}|p{4cm}|p{2cm}|p{1cm}|}
  \hline
  \textbf{No.\newline Jalur} & \textbf{Prosedur Uji} &
                                                    \textbf{\emph{Expected Result}}
  & \textbf{\emph{Result}} & \textbf{Status} \\\hline
  %
  1 & Menjalankan \emph{ssh\_out\_stream} dengan \emph{exit\_status\_ready()} bernilai
      \emph{true} & \emph{ssh\_out\_stream} akan berhenti berjalan & \emph{As expected} & Valid \\\hline
      %
  2 & Menjalankan \emph{ssh\_out\_stream} dengan \emph{variable} \emph{length} bernilai
      lebih kecil dari 0 & \emph{ssh\_out\_stream} tidak akan menampilkan nilai \emph{variable} \emph{length}
  & \emph{As expected} & Valid \\\hline
  %
  3 & Menjalankan \emph{ssh\_out\_stream} dengan \emph{variable} \emph{length} bernilai
      lebih besar dari 0 & \emph{ssh\_out\_stream} akan menampilkan nilai \emph{variable} \emph{length}
  & \emph{As expected} & Valid \\\hline
  %
  \caption{Pengujian \emph{unit} \emph{ssh\_out\_stream}}
  \label{jalur:ssh_out_stream}
\end{longtable}

\end{document}

Thank you in advance

Answer 1

• your table is much wider than text area,
• you can increase text width by use of the package geometry or define narrower second and third column (later is not recommended)
• width of the first and the last column is to small, better is used natural width of column (see mwe below)
• width of the second column is to small for nice fitting oc cell column into its cells
• with use of the ragged2e package you can better align text in cells.
• for column headers i suggest to use \thead macro from the makecell package
• more vertical space around cells contents you can obtain with the macro \makegappedcells also from the package \makecell

off-topic

• table caption, special at longtable should be on the top of table

  \documentclass{report}
  \usepackage{geometry}   % new
  
  \usepackage{ragged2e}
  \usepackage{longtable,
              makecell}   % new
  \newcolumntype{L}[1]{>{\RaggedRight}p{#1}}  % new
  \renewcommand\theadfont{\small\bfseries}    % new
  \setcellgapes{3pt}                          % new
  \overfullrule=2cm % show overfull
  
  %-------------------------------------- only for show page layout
  \usepackage{showframe}
  \renewcommand\ShowFrameLinethickness{0.25pt}
  \renewcommand*\ShowFrameColor{\color{red}}
  %---------------------------------------------------------------%
  
  \begin{document}
  
  {\makegapedcells    % new
   \begin{longtable}{|c|L{5cm}|L{4cm}|>{\itshape}L{2cm}|c|}   % changed
  \caption{Pengujian \emph{unit} \emph{ssh\_out\_stream}}
      \label{jalur:ssh_out_stream}                \\
      \hline
  \thead{No.\\ Jalur}
      &   \thead{Prosedur\\ Uji}
              &   \itshape\thead{Expected\\ Result}
                  &   \thead{Result}
                      &   \thead{Status}          \\
      \hline
    %
  1   &   Menjalankan \emph{ssh\_out\_stream} dengan \emph{exit\_status\_ready()} bernilai \emph{true}
          &   \emph{ssh\_out\_stream} akan berhenti berjalan
              &   As expected         & Valid \\
      \hline
  2   & Menjalankan \emph{ssh\_out\_stream} dengan \emph{variable} \emph{length} bernilai lebih kecil dari 0
          &   \emph{ssh\_out\_stream} tidak akan menampilkan nilai \emph{variable} \emph{length}
              &   As expected         & Valid      \\
      \hline
  3   & Menjalankan \emph{ssh\_out\_stream} dengan \emph{variable} \emph{length} bernilai lebih besar dari 0
          &   \emph{ssh\_out\_stream} akan menampilkan nilai \emph{variable} \emph{length}
              &   As expected         & Valid      \\
  \end{longtable}
  }
  

(red lines indicate text borders)