'functions' is the name of the tree structure in the form class, as
class SomeForm extends ActionForm
{ private TreeStructure functions;}this form class also includes some String attributes. The whole display works fine, i have some text boxes for the String fields in the form, the tree structure gets displayed with the corresponding checkboxes. the problem arises when i select a particular checkbox and submit. thats when i get the error i mentioned earlier.
however if i just fill the text boxes and do not select and checkbox the form submits fine.
any clues?
thanks Ajay
From: [EMAIL PROTECTED] Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> To: "Struts Users Mailing List" <[EMAIL PROTECTED]> Subject: Re: error:null property value please HELP Date: Mon, 22 Dec 2003 13:28:17 +1100
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.
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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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