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Posted to user@struts.apache.org by Jerzy Kalat <jk...@home.com> on 2001/06/08 17:09:39 UTC
Nested property error ?!?
Hi,
I am new to Struts technology, so forgive me if I not see something obvious here.
Based on e-Commerece example from Wrox book, I have created form to maintain organization, which suppose to behave like SQL Form. So I have browsing keys, Update, Insert, Delete and other keys. Right now I have no access to database, so I used Struts database utility and store collection of records.
Everything is working fine, I can see and navigate between records, I can update or delete them.
The problem starts when I try to simulate retrieving of not all records but records based on some criteria entered in the form. In Action servlet I wrote:
OrganizationForm orgForm = (OrganizationForm)form;
Organization orgFromForm = orgForm.getOrganization();
......
HashMap orgTable =
(HashMap) servletContext.getAttribute(Constants.ORGANIZATION_TABLE_KEY);
if(orgTable == null) {
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("error.orgTable.missing"));
} else {
int size = orgTable.size();
orgForm.setTotal(size);
if(size > 0) {
int i = 1;
Iterator iterator = orgTable.values().iterator();
Organization[] orgArray = new Organization[size+1];
Organization anOrg = null;
while(iterator.hasNext()) {
anOrg = (Organization)iterator.next();
if( "Query".equals(mode) && "Retrieve".equals(action)) {
if( orgForm.matches(anOrg))
orgArray[i++] = anOrg;
} else {
orgArray[i++] = anOrg;
}
}
So, for every record from otgArray, I want to compare city of address of organization with
city field from the form.
In OrganizationForm.java I create method:
public boolean matches( Organization org )
{
System.out.println("FORM=" + this.organization );
System.out.println("COLL=" + org );
if ( this.organization != null && this.organization.getAddress() != null &&
this.organization.getAddress().getCity() != null ) {
String cityFromForm = this.organization.getAddress().getCity();
if ( org != null && org.getAddress() != null && org.getAddress().getCity() != null ) {
String cityFromCollection = org.getAddress().getCity();
System.out.println("COMPARE " + cityFromCollection + " WITH " + cityFromForm );
if( cityFromCollection.equals( cityFromForm ))
return true;
else
return false;
}
return false;
}
return true; // no selection provided
}
If I call this method I have error:
javax.servlet.ServletException: Null property value for 'organization'
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
...
Root cause:
java.lang.IllegalArgumentException: Null property value for 'organization'
at org.apache.struts.util.PropertyUtils.getNestedProperty(PropertyUtils.java:347)
If I comment out if statements from this method, I can see BOTH records: FORM=... and COLL=... with proper atribute values. So WHY I CANNOT COMPARE THEM?Can anybody help me with what I do wrong? Thanks in advance, Jerzy Kalat
Re: Nested property error - resolved
Posted by Jerzy Kalat <jk...@home.com>.
Hi,
It was something obvious :-)
JK
----- Original Message -----
From: Jerzy Kalat
To: struts-user@jakarta.apache.org
Sent: Friday, June 08, 2001 11:09 AM
Subject: Nested property error ?!?
Hi,
I am new to Struts technology, so forgive me if I not see something obvious here.
Based on e-Commerece example from Wrox book, I have created form to maintain organization, which suppose to behave like SQL Form. So I have browsing keys, Update, Insert, Delete and other keys. Right now I have no access to database, so I used Struts database utility and store collection of records.
Everything is working fine, I can see and navigate between records, I can update or delete them.
The problem starts when I try to simulate retrieving of not all records but records based on some criteria entered in the form. In Action servlet I wrote:
OrganizationForm orgForm = (OrganizationForm)form;
Organization orgFromForm = orgForm.getOrganization();
......
HashMap orgTable =
(HashMap) servletContext.getAttribute(Constants.ORGANIZATION_TABLE_KEY);
if(orgTable == null) {
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("error.orgTable.missing"));
} else {
int size = orgTable.size();
orgForm.setTotal(size);
if(size > 0) {
int i = 1;
Iterator iterator = orgTable.values().iterator();
Organization[] orgArray = new Organization[size+1];
Organization anOrg = null;
while(iterator.hasNext()) {
anOrg = (Organization)iterator.next();
if( "Query".equals(mode) && "Retrieve".equals(action)) {
if( orgForm.matches(anOrg))
orgArray[i++] = anOrg;
} else {
orgArray[i++] = anOrg;
}
}
So, for every record from otgArray, I want to compare city of address of organization with
city field from the form.
In OrganizationForm.java I create method:
public boolean matches( Organization org )
{
System.out.println("FORM=" + this.organization );
System.out.println("COLL=" + org );
if ( this.organization != null && this.organization.getAddress() != null &&
this.organization.getAddress().getCity() != null ) {
String cityFromForm = this.organization.getAddress().getCity();
if ( org != null && org.getAddress() != null && org.getAddress().getCity() != null ) {
String cityFromCollection = org.getAddress().getCity();
System.out.println("COMPARE " + cityFromCollection + " WITH " + cityFromForm );
if( cityFromCollection.equals( cityFromForm ))
return true;
else
return false;
}
return false;
}
return true; // no selection provided
}
If I call this method I have error:
javax.servlet.ServletException: Null property value for 'organization'
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
...
Root cause:
java.lang.IllegalArgumentException: Null property value for 'organization'
at org.apache.struts.util.PropertyUtils.getNestedProperty(PropertyUtils.java:347)
If I comment out if statements from this method, I can see BOTH records: FORM=... and COLL=... with proper atribute values. So WHY I CANNOT COMPARE THEM? Can anybody help me with what I do wrong? Thanks in advance, Jerzy Kalat