Nested property error ?!?

Fri, 08 Jun 2001 08:56:08 -0700

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
 

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