问题
I'm trying to use the liferay-ui:icon-help tag in my (Liferay 6.1) portlet, but adding
<liferay-ui:icon-help message="help me"/>
to my edit.jsp gives me
ERROR [render_portlet_jsp:154] java.lang.NullPointerException at com.liferay.taglib.ui.IconHelpTag.processEndTag(IconHelpTag.java:57)
I'm sure I imported the taglib correctly because other tags such as liferay-ui:calendar work just fine.
Did I forget anything?
edit: IconHelpTag.java:57 suggests that there's something wrong involving the theme, but I did not play around with that, the server is pretty much as it came out of the box.
回答1:
Looks like the liferay-ui:icon-help tag makes call to a theme related object, add the following lines to your jsp:
<%@ taglib uri="http://liferay.com/tld/theme" prefix="liferay-theme"%>
<liferay-theme:defineObjects />
来源：https://stackoverflow.com/questions/10811498/nullpointerexception-using-liferay-ui-taglib