Hi Ajay
I am doing something similar... I have a Tree class and a Node class to
represent either branches or "leaves" of the tree.
The Tree class has a field called treeRoot that represents the root Node.
I ha ve an action that creates the tree and puts it on the request
then in the JSP I have something like:
<%-- Loop through the array list of trees to display each root node.
Note that 'myTree' was placed on the request by an Action --%>
<logic:present name="myTree">
<nested:root name="currentTree">
<nested:nest property="treeRoot">
<div class="root">
<jsp:include page="treenode.jsp" />
</div>
</nested:nest>
</nested:root>
</logic:present>
Actually my jsp is slightly different because I can have multiple root
nodes and I also iterate through each root node to display each tree. I
have chopped those bits out to make the code more readable.
So it seems that you are trying to reference a field "functions" that
isn't declared in your tree class.
Hope that helps.
Heya Gosper
CSC Australia
212 Northbourne Ave, Braddon ACT 2612
Ph: +61 (0) 2 6246 8155 Fax: +61 (0) 2 62468100
MOB: 0401 611779
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"ajay brar" <[EMAIL PROTECTED]>
22/12/2003 12:55 PM
Please respond to "Struts Users Mailing List"
To: [EMAIL PROTECTED]
cc:
Subject: error:null property value please HELP
hi!
i am getting an error when i submit a form.
briefly i have a tree stucture that gets displayed, along with checkboxes
to
select a particular node. the tree structure is of the type:
class TreeStructure{ private ArrayList children;} //the ArrayList
children
contains objects of type
//TreeStructure
the structure includes a property 'selected' of type boolean.
My ActionForm includes the tree as a property called 'functions'. i
display
them as
<html:form action="/saveUserConfig">
<nested:nest property="functions">
<jsp:include page="treenode.jsp"/>
</nested:nest>
<html:submit value="Submit"/>
</html:form>
//treenode.jsp is
<nested:root>
<nested:checkbox property="selected" value="true"/>
<nested:write property="nodeName"/><br>
<nested:iterate property="children">
<jsp:include page="treenode.jsp" />
</nested:iterate>
</nested:root>
the error i get is
exception
javax.servlet.ServletException: BeanUtils.populate
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1254)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:821)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.IllegalArgumentException: Null property value for 'functions'
org.apache.commons.beanutils.PropertyUtils.getNestedProperty(PropertyUtils.java:755)
org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:801)
org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:796)
org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:729)
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:1252)
org.apache.struts.action.RequestProcessor.processPopulate(RequestProcessor.java:821)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:254)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
please help
thanks
Ajay
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