Struts 2 FreeMarker template error. Stack.findValue ('top') - undefined
I have another question for Struts2.
I have done a chart and data. What happens with the first load of my chart (and clicking the chart data to link to the data), it works fine. But when I changed the parameter in my chart and wanted to repopulate the data, it gives me this error:
Error on line 69, column 13 in template/simple/select.ftl
stack.findValue('top') is undefined.
Unable to assign itemKey
Problematic instruction:
==> assignment: itemKey=stack.findValue('top') [on line 69, column 13 in
template/simple/select.ftl]
in user-directive s.iterator [on line 59, column 1 in template/simple/select.ftl]
StackTrace
freemarker.core.InvalidReferenceException: Error on line 69, column 13 in template/simple/select.ftl
stack.findValue('top') is undefined.
It cannot be assigned to itemKey
at freemarker.core.Assignment.accept(Assignment.java:111)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.IfBlock.accept(IfBlock.java:82)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.visit(Environment.java:299)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at org.apache.struts2.components.template.FreemarkerTemplateEngine.renderTemplate(FreemarkerTemplateEngine.java:157)
at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:559)
at org.apache.struts2.components.UIBean.end(UIBean.java:513)
at org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
at org.apache.jsp.Annotate_jsp._jspx_meth_s_005fselect_005f9(Annotate_jsp.java:1086)
at org.apache.jsp.Annotate_jsp._jspx_meth_s_005fform_005f0(Annotate_jsp.java:629)
at org.apache.jsp.Annotate_jsp._jspService(Annotate_jsp.java:419)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.ja
How do I fix this?
Thank you in advance:)
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OK I know this is a backward problem, but as far as I struggled to find solutions, here's what I found from the link here :
Null values ββadded to the list you are facing Template error.
will check database again or check list values ββif u added Null values ββthis problem will come ..
So I went through the list and bam! That was correct: there were zero values ββin between, and that struts / freemaker now knew what to do.
My solution was in my SQL, I selected the field I wanted, and to make sure I added "field IS NOT NULL". My page worked well after that.
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