class cast exception help

[ganesh sahu, modificado hace 11 años.]

i have created a studentFinderImpl class which uses the custom sql to return a List object.I am using the search container to show the results but its giving a class cast exception saying object can not be casted to app.model.student.

i am giving my code please have a look

studentFinderImpl class

public class studentFinderImpl extends BasePersistenceImpl<student> implements studentFinder
{

	public List<student> findStudents() throws SystemException
	{
		System.out.println("invoked inside findstudents");
		SQLQuery query2=null;
		Session session = null;
		try {	
		
		final String id1="findstudents";
		session = openSession();
		String sql = CustomSQLUtil.get(id1);
		SQLQuery query = session.createSQLQuery(sql);
		query2=query;
		//query.addEntity(“student”,studentImpl.class);
		//QueryPos qPos = QueryPos.getInstance(query);
		//qPos.add(name);
		
		
		}
		
		catch(Exception e)
		{
			}
		
		
		
		return(List) query2.list();
		
		}
		
		
		
		
		
		
		
		}
		

</student></student>

studentlocalserviceimpl class

public class studentLocalServiceImpl extends studentLocalServiceBaseImpl {
	/*
	 * NOTE FOR DEVELOPERS:
	 *
	 * Never reference this interface directly. Always use {@link com.app.lop.service.studentLocalServiceUtil} to access the student local service.
	 */
	
	
public List getmystudents()
	{
	List<student> a=null;
	
	try {
		a=studentFinderUtil.findStudents();
		

		
		
		
		
	} catch (com.liferay.portal.SystemException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}	
    	
 
		
	return a;
		
	}
	
}

</student>

in result.jsp

<%@page import="java.util.Iterator"%>
<%@page import="java.util.ArrayList"%>
<%@page import="com.app.lop.model.student"%>
<%@page import="java.util.List"%>
<%@page import="javax.portlet.*,com.liferay.portal.kernel.util.ListUtil"%>
<%@page import="com.app.lop.service.studentLocalServiceUtil"%>
<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui" %>
<portlet:defineobjects />

&lt;%


List<student> a=(List)studentLocalServiceUtil.getmystudents();


int count=studentLocalServiceUtil.getstudentsCount();

PortletURL iteratorURL = renderResponse.createRenderURL();


%&gt;


<liferay-ui:search-container delta="4" emptyresultsmessage="no such user" iteratorurl="<%=iteratorURL%>">


    <liferay-ui:search-container-results>
    &lt;%
    results= ListUtil.subList(a,searchContainer.getStart(),searchContainer.getEnd());

    total=a.size();
    
    System.out.println("inside this jsp");
    
    pageContext.setAttribute("results",results);
    pageContext.setAttribute("total",total);

    %&gt;
    
          </liferay-ui:search-container-results>
    
  
       

    <liferay-ui:search-container-row classname="com.app.lop.model.student" keyproperty="studentid" modelvar="data">
        <liferay-ui:search-container-column-text name="fname" property="studentname" />

        <liferay-ui:search-container-column-text name="mycity" property="city" />
         
          <liferay-ui:search-container-column-text name="college" property="college" />
        
        <liferay-ui:search-container-column-jsp path="/html/data/edit.jsp">
        </liferay-ui:search-container-column-jsp>
        

        
    </liferay-ui:search-container-row>
    

    <liferay-ui:search-iterator searchContainer="<%= searchContainer %>" paginate="true" />
    
</liferay-ui:search-container>


</student>

[Hitoshi Ozawa, modificado hace 11 años.]

You didn't post the error message. In which file and which row is the error occurring?

[ganesh sahu, modificado hace 11 años.]

the error is in result.jsp saying ------------------------------>Object can not be casted to com.app.lop.model.student

<liferay-ui:search-container-row
className="com.app.lop.model.student"
keyProperty="studentid"
modelVar="data"
>

[Hitoshi Ozawa, modificado hace 11 años.]

Before the search tag, try looping through the result from the finder method to see if "studentid" and other columns are being returned.

[Prakash Khanchandani, modificado hace 11 años.]

You have commented this line:

//query.addEntity(“student”,studentImpl.class);

try uncommenting this line
and also at the end you are writing:

return(List) query2.list();

instead of

return(List<student>) query2.list();</student>

[Umasankar Jeyaraj, modificado hace 10 años.]

Aryan sahu:

the error is in result.jsp saying ------------------------------>Object can not be casted to com.app.lop.model.student

<liferay-ui:search-container-row
className="com.app.lop.model.student"
keyProperty="studentid"
modelVar="data"
>

Hi Aryan,
I am getting the same issue. Did you get any solution for this???

[Christoph Rabel, modificado hace 10 años.]

Take a look at the answer of Prakash Khanchandani. If this doesn't help you, please post some code (especially the finder implementation).