hibernate error

[Amirtharaj Chinnaraj]

hi guys iam facing an error
while casting a collection

below shows the code

  public Object validateFreeDownloads(String [] freeDownloads) throws Exception
{
for(int i=0;i<freeDownloads.length;i++)
{
String temp=freeDownloads[i];
String productTracks[]=temp.split(",");
Product p=null;
HashSet dbTrackCollections=null;
ArrayList trackCollections=null;
for(int j=0;i<productTracks.length;i++)
{
    if(j==0)
    {
ProductDAO pDAO=(ProductDAO) getDaoFactory().createDAO("productDAOImplementer");
p=(Product)pDAO.validateProduct(productTracks[0]);
if(p==null)
{return "failure";}
else{}
[B]dbTrackCollections=(HashSet)p.getProductTracks();[/B]
}
 
if(dbTrackCollections!=null)
{ trackCollections=(ArrayList)Arrays.asList(productTracks);
  trackCollections.remove(0);
   for(Iterator  it=dbTrackCollections.iterator();it.hasNext() :wink: 
{
ProductTrack pt=(ProductTrack)it.next();
int TKno=pt.getTrackNumber();
String s=""+TKno;
if(trackCollections.contains(s)){}
else
{return "failure ,"+p.getProductID()+" , "+s;}
}
}

 }
}

return "sucess";
}  

below shows the stack trace

  
[B]java.lang.ClassCastException: org.hibernate.collection.PersistentSet[/B]
com.rs.commerce.businessobjects.administrator.BasicAdministratorProcessor.validateFreeDownloads(BasicAdministratorProcessor.java:264)
com.softslate.commerce.administrator.core.SettingsAction.execute(SettingsAction.java:52)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
com.softslate.commerce.administrator.core.AdministratorFilter.doFilter(AdministratorFilter.java:44)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
com.softslate.commerce.customer.core.SEOFilter.doFilter(SEOFilter.java:86)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
com.softslate.commerce.customer.core.HibernateFilter.doFilter(HibernateFilter.java:69)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
java.lang.Thread.run(Thread.java:595)
  

[Paul Sturrock]

What kind of Set does getProductTracks() return? What HashSet have you imported into your class? A Hibernare PersistentSet does not extend HashSet, so you can't cast from one to the other.

[Amirtharaj Chinnaraj]

getProductTracks() returns Collection
but i have tried with casting ArrayList also iam getting the same error

thanks
amir
[ April 23, 2008: Message edited by: Amirtharaj Chinnaraj ]

[Paul Sturrock]

So why is dbTrackCollections defined as a HashSet? Chould it not be a Collection too?

[Cameron Wallace McKenzie]

Run a getClass() method call on the object before the cast and see what object type is being returned. It may not be what you expect!

-Cameron McKenzie