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\begin{frame}
  \frametitle{Recursive Associations}
  
  \begin{exampleblock}{}
  Example: an employee is supervised by a manager.
  \begin{center}
  \begin{tikzpicture}
  \umlclass{employee}{ 
    +id \\
    +name \\
    +jobTitle \\
    +payGrade 
    }{ 
    } 
  \umlclass[x=7]{manager}{ 
    +id \\
    +name \\
    +jobTitle \\
    +payGrade 
    }{ 
    } 
  \umlassoc[arg1=1..*,pos1=0.1,arg2=0..1,pos2=.9,name=assoc]{employee}{manager} 
%   \node [ao=assoc-1] {deposits $\triangleright$};
  \node [bo=assoc-1] {$\triangleleft$ supervises$\quad$};
  \end{tikzpicture} 
  \end{center}
  \pause
  This diagram is \alert{wrong} since a manager happens to be an employee as well.
  \end{exampleblock}
\end{frame}