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>