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How to check whether session was timed out in jsp page


Best what you could do is to add a <meta http-equiv="refresh"> tag to the <head> of the master template which redirects the page to the session timeout error page automatically whenever the session is expired. Since you're using a shared error page, you could pass the condition as a request parameter:
<meta http-equiv="refresh" content="${pageContext.session.maxInactiveInterval};url=error.jsp?type=timeout" />
and check it in the error.jsp as follows:
<c:choose>
    <c:when test="${param.type == 'timeout'}">
        <p>Your session has been timed out.</p>
    </c:when>
    <c:otherwise>
        <!-- Handle default case here. -->
    </c:otherwise>
</c:choose>

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