Map-based nested bean--No bean specified?
I posted on this before, so I thought I'd post a more concrete example
this time.
I'm using a map-based nested bean, and I'm getting the following error:
java.lang.IllegalArgumentException: No bean specified
org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptor(PropertyUtilsBean.java:751)
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:937)
org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)
org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
(add nausea)
So I whipped up an example. I have a DoTestAction that populates the
form and sticks it in a request. The form is called TestForm and looks
like this:
package test.form;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.struts.action.ActionForm;
public class TestForm extends ActionForm
{
public static final long serialVersionUID = 1;
private String firstName;
private String lastName;
private MapString, ChildPerson children;
public TestForm()
{
this.firstName = ;
this.lastName = ;
this.children = new TreeMapString, ChildPerson();
}
public SetString getChildIds()
{
return this.children.keySet();
}
public MapString, ChildPerson getChildren()
{
return this.children;
}
public void setChildren( MapString, ChildPerson children )
{
this.children = children;
}
public String getFirstName()
{
return this.firstName;
}
public void setFirstName( String firstName )
{
this.firstName = firstName;
}
public String getLastName()
{
return this.lastName;
}
public void setLastName( String lastName )
{
this.lastName = lastName;
}
public void setChild( String id, ChildPerson child )
{
this.children.put( id, child );
}
public ChildPerson getChild( String id )
{
return this.children.get( id );
}
}
The populate action looks like this:
package test.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import test.form.ChildPerson;
import test.form.TestForm;
public class DoTestAction extends Action
{
@Override
public ActionForward execute( ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response )
throws Exception
{
TestForm testForm = new TestForm();
ChildPerson child = new ChildPerson();
child.setFirstName( First 1 );
child.setLastName( Last 1 );
testForm.setChild( 1, child );
child = new ChildPerson();
child.setFirstName( First 2 );
child.setLastName( Last 2 );
testForm.setChild( 2, child );
request.setAttribute( testForm, testForm );
return mapping.findForward( default );
}
}
While the JSP itself looks like this:
%@ taglib uri=http://java.sun.com/jsp/jstl/core; prefix=c %
%@ taglib uri=/tags/struts-html prefix=html %
%@ page language=java contentType=text/html; charset=UTF-8
pageEncoding=UTF-8%
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
html
head
meta http-equiv=Content-Type content=text/html;
charset=UTF-8
titleTest/title
/head
body
html:form action=/test
First Name: html:text property=firstName /br
Last Name: html:text property=lastName /br
c:forEach var=childId items=${testForm.childIds}
Child #${childId} First Name: html:text
property=child(${childId}).firstName /br
Child #${childId} Last Name: html:text
property=child(${childId}).lastName /br
/c:forEach
html:submit /
/html:form
/body
/html
My struts-config.xml (though I'm not sure this would help) has this for
the forms and actions:
form-bean name=doTestForm
type=test.form.DoTestForm /
form-bean name=testForm
type=test.form.TestForm /
...
action path=/doTest type=test.action.DoTestAction
name=doTestForm scope=request
validate=false
forward name=default path=/test.jsp /
/action
action path=/test type=test.action.TestAction name=testForm
scope=request
validate=false
forward name=default path=/test.jsp /
/action
I won't bother to post TestAction (/testAction) as it doesn't even get
to that point. Am I doing this the right way? Is this sort of thing
even possible? It seems such a natural way
[SOLVED?] Re: Map-based nested bean--No bean specified?
OK so I replaced the 'getChild( String id )' method with the following:
public ChildPerson getChild( String id )
{
ChildPerson child = this.children.get( id );
if ( child == null )
{
child = new ChildPerson();
this.children.put( id, child );
}
return child;
}
And my problems were all solved. I tried this solution before in my
previous post, but made a typo, which caused it to fail with the same
error, so I thought my previous solution simply didn't work. It wasn't
until I tried this solution with my concrete example below that I
noticed the typo (was creating a new child, putting it into the map, but
then STILL returning null. Note that setChild( String id, ChildPerson
child ) never gets called by the framework.
So my final question: Is all this a good idea? :)
- Scott
Scott Van Wart wrote:
I posted on this before, so I thought I'd post a more concrete example
this time.
I'm using a map-based nested bean, and I'm getting the following error:
java.lang.IllegalArgumentException: No bean specified
org.apache.commons.beanutils.PropertyUtilsBean.getPropertyDescriptor(PropertyUtilsBean.java:751)
org.apache.commons.beanutils.BeanUtilsBean.setProperty(BeanUtilsBean.java:937)
org.apache.commons.beanutils.BeanUtilsBean.populate(BeanUtilsBean.java:811)
org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java:298)
org.apache.struts.util.RequestUtils.populate(RequestUtils.java:493)
(add nausea)
So I whipped up an example. I have a DoTestAction that populates the
form and sticks it in a request. The form is called TestForm and
looks like this:
package test.form;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.struts.action.ActionForm;
public class TestForm extends ActionForm
{
public static final long serialVersionUID = 1;
private String firstName;
private String lastName;
private MapString, ChildPerson children;
public TestForm()
{
this.firstName = ;
this.lastName = ;
this.children = new TreeMapString, ChildPerson();
}
public SetString getChildIds()
{
return this.children.keySet();
}
public MapString, ChildPerson getChildren()
{
return this.children;
}
public void setChildren( MapString, ChildPerson children )
{
this.children = children;
}
public String getFirstName()
{
return this.firstName;
}
public void setFirstName( String firstName )
{
this.firstName = firstName;
}
public String getLastName()
{
return this.lastName;
}
public void setLastName( String lastName )
{
this.lastName = lastName;
}
public void setChild( String id, ChildPerson child )
{
this.children.put( id, child );
}
public ChildPerson getChild( String id )
{
return this.children.get( id );
}
}
The populate action looks like this:
package test.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import test.form.ChildPerson;
import test.form.TestForm;
public class DoTestAction extends Action
{
@Override
public ActionForward execute( ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response )
throws Exception
{
TestForm testForm = new TestForm();
ChildPerson child = new ChildPerson();
child.setFirstName( First 1 );
child.setLastName( Last 1 );
testForm.setChild( 1, child );
child = new ChildPerson();
child.setFirstName( First 2 );
child.setLastName( Last 2 );
testForm.setChild( 2, child );
request.setAttribute( testForm, testForm );
return mapping.findForward( default );
}
}
While the JSP itself looks like this:
%@ taglib uri=http://java.sun.com/jsp/jstl/core; prefix=c %
%@ taglib uri=/tags/struts-html prefix=html %
%@ page language=java contentType=text/html; charset=UTF-8
pageEncoding=UTF-8%
!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.01 Transitional//EN
html
head
meta http-equiv=Content-Type content=text/html;
charset=UTF-8
titleTest/title
/head
body
html:form action=/test
First Name: html:text property=firstName
/br
Last Name: html:text property=lastName
/br
c:forEach var=childId items=${testForm.childIds}
Child #${childId} First Name:
html:text property=child(${childId}).firstName /br
Child #${childId} Last Name:
html:text property=child(${childId}).lastName /br
/c:forEach
html:submit
Map-based nested bean
(Struts 1.2.9, Tomcat 5.5.17)
I have something similar to the following in my ActionForm:
public class MyForm extends ActionForm {
public static class NestedBean {
private String name;
private String value;
// String getName(), String getValue(), void setName( String
), void setValue( String )
}
private MapString, NestedBean children = new TreeMapString,
NestedBean();
// Map getChildren(), void setChildren( Map )
public NestedBean getChild( String key ) {
return this.children.get( key );
}
public void setChild( String key, NestedBean child ) {
this.children.put( key, child );
}
}
I use it like so in the JSP:
html:form action=/myAction
html:text property=myForm.child(whatever).name /
html:text property=myForm.child(whatever).value /
/html:form
Everything works fine until form submission. Then I get errors like No
bean specified in the populate methods of BeanUtils. Looking at the
property descriptors I see that it's not picking up the getChild and
setChild accessors. Is this the right way to implement this? Am I
still missing something?
Thanks,
Scott
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