Struts 2 Type conversion

[mahanare]

Hi, I need help in resolving type conversion issue in struts 2.

Here is my problem definition.

I have a structs 2 action class called AuditTrailAction.
Here is the class definition. It contains a List<AuditView> I have given my
AuditView bean definition below.

Action contains a List which intern contains a bean containing a Map of
another bean. 

I need to display this data into a tabular structure in jsp page. 

List<AuditView>, each AuditView bean contains Map<Auditproperty> and
AuditProperty bean contains couple of properties.

for each AuditView bean in the list, I need to iterate through all the
AuditProperty beans and display their properties into a row (html table
row).

I have been spending time whole day today with no luck. it looks like there
is some type conversion issue here. I went through
http://struts.apache.org/2.x/docs/type-conversion.html, but not getting a
solution for my scenario which looks little complex. 

Please help me!
Thanks
harinath



public class AuditTrailAction extends ActionSupport implements RequestAware
{
        private List<AuditView> results;
        private int pageSize = 20;
        private int page;
        private AuditLogDao auditLog;
        private Map request;
        private String entity;
        private String pk;
        private List<String> columnLabels;

        public List<String> getColumnLabels() {
                return columnLabels;
        }

        public void setColumnLabels(List<String> columnLabels) {
                this.columnLabels = columnLabels;
        }

        public int getPage() {
                return page;
        }

        public void setPage(int page) {
                this.page = page;
        }

        public String getEntity() {
                return entity;
        }

        public void setEntity(String entity) {
                this.entity = entity;
        }

        public String getPk() {
                return pk;
        }

        public void setPk(String pk) {
                this.pk = pk;
        }

        public void setAuditLog(AuditLogDao auditLog) {
                this.auditLog = auditLog;
        }

        public List<AuditView> getResults() {
                return results;
        }

        public void setResults(List<AuditView> results) {
                this.results = results;
        }

        public String execute() {
                
                try {
                        results = auditLog.getAuditTrialView(page, pageSize, 
entity, pk);
                        columnLabels = new ArrayList<String>();
                        
                        if (results != null && results.size() != 0) {
                                AuditView view = results.get(0);
                                Map<String, AuditProperty> mapProperties = 
view.getPropertyList();
                                Set<String> properties = mapProperties.keySet();
                                for (String prop : properties) {
                                        columnLabels.add(prop);
                                }
                        }
                } catch (AuditException e) {
                        e.printStackTrace();
                } catch (Exception e) {
                        e.printStackTrace();
                }
                
                /*
                 * try {
                 * 
                 * results =auditLog.getAuditTrialInfo(page, pageSize); //
                 * request.put("results", results); } catch (AuditException e) 
{ // TODO
                 * Auto-generated catch block e.printStackTrace(); }
                 */
                return SUCCESS;

        }

        public void setRequest(Map<String, Object> request) {
                // TODO Auto-generated method stub
                this.request = request;
        }

}



@SuppressWarnings("serial")
public class AuditView implements Serializable {
        
        private Map<String,AuditProperty> propertyList;// = new
ArrayList<AuditProperty>();

        public Map<String, AuditProperty> getPropertyList() {
                if(propertyList ==null)
                {
                        propertyList = new HashMap<String, AuditProperty>();
                }
                return propertyList;
        }

        public void setPropertyList(Map<String, AuditProperty> propertyList) {
                this.propertyList = propertyList;
        }

}

And AuditProperty bean

 */
@SuppressWarnings("serial")
public class AuditProperty implements Serializable {
        
        private static final Log logger = 
LogFactory.getLog(AuditProperty.class);
        private String oldValue;
        private String newValue;
        private boolean updateFlag;
        
        
        
        public boolean isUpdateFlag() {
                return updateFlag;
        }
        public void setUpdateFlag(boolean updateFlag) {
                this.updateFlag = updateFlag;
        }
        public String getOldValue() {           
                return oldValue;
                
        }
        public void setOldValue(String oldValue) {
                this.oldValue = oldValue;
        }
        public String getNewValue() {
                return newValue;
        }
        public void setNewValue(String newValue) {
                this.newValue = newValue;
        }
        public String toString()
        {
                String value= oldValue + " : " + newValue + " : " + updateFlag;
                logger.debug(value);
                return value;
        }
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