Using adjustbox type functionality with supertabular

I am trying to add a long table to a two column latex document. Since the table is long, without continuing in the 2nd column, it continue in the first column like below.

Following is the current code that I am using.

begin{table}[htbp]
caption{Exceptions encountered by participants and their reactions}
    begin{center}
    begin{adjustbox}{width=0.5textwidth}
    begin{tabular}{|p{0.3linewidth}|p{0.4linewidth}|p{0.3linewidth}|}
    hline
    textbf{Context}&textbf{Exception message} &textbf{Reaction of the participant} 
    ...
    ...
    end{tabular}
    label{exceptions}
    end{adjustbox}
    end{center}
    end{table}

I am also using adjustbox as I need to break the text inside the table cell.

Now I need to break my table to continue in the next column. I read and tried to use supertabularas follows.

    begin{supertabular}{lll}
    hline
    textbf{Context}&textbf{Exception message} &textbf{Reaction of the participant} 
    ...
    ...
    end{tabular}

But now my table looks as below.

My 3rd column is no longer in the page. How can I solve this?

    begin{supertabular}{|p{0.3linewidth}|p{0.4linewidth}|p{0.3linewidth}|}
    hline
    textbf{Context}&textbf{Exception message} &textbf{Reaction of the participant} 
    ...
    ...
    end{tabular}