我有一个形式变量ftDtClo定义形式,如,

public String getFtDtClo () {
  String dateStr = "";
    if(this.getCse().getDtClo()!=null) {
        dStr = DtUtil.formatDate(this.getCse().getgetDtClo(), DtUtil.FORMAT_MM_DD_YYYY_KK_MM_SS);
    }
   return dateStr;            
}

在JSP中,代码看起来像,

<c:choose>
        <c:when test="${not empty cseList.ftDtClo}">
        <c:out value="${cseList.ftDtClo}"/>
        </c:when>
        </c:choose>

但我得到了foll例外,

wrapped exception:
javax.servlet.jsp.JspException: javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "test" with value "${not empty cseList.ftDtClo}": An error occurred while getting property "ftDtClo" from an instance of class abc.cseDetailLists (java.lang.NullPointerException)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:306)
    at org.apache.taglibs.standard.tag.common.core.ImportSupport.doEndTag(ImportSupport.java:161)

我假设不是空的将负责空检查.我错过了什么吗？任何i / p都非常感谢.

解决方法:

   <c:choose>
      <c:if test=${cseList != null}>  
        <c:when test="${not empty cseList.ftDtClo}">
        <c:out value="${cseList.ftDtClo}"/>
        </c:when>
       </c:if>
    </c:choose>