Need help with JSTL if statement

Hi Guys

I have this code where I check if the data is null before doing date formatting. In addition I also need to check if the length is greater than 0. Would yoou guys know how I can do that

<c:choose><c:when test="${fn:trim(current) != 'null'}">
                                          <c:set var="invoiceDate" value="${fn:trim(current)}" />
                                          <fmt:parseDate var="parsedInvoiceDate" value="${invoiceDate}" pattern="yyyy-MM-dd HH:mm:ss.SSS" />
                                          <fmt:formatDate value="${parsedInvoiceDate}" pattern="MM/dd/yyyy" />
                                          </c:when> <c:otherwise>
                                                      <c:out value="${current}" />
                                                </c:otherwise> </c:choose>

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