[rules-users] ClassCast exception while doing retract

[Greg Barton]

Are you passing in an array of FactHandles?  If not you can't cast them to FactHandle.  If you're passing in objects that are in WM, you can get their FactHandle by calling WorkingMemory.getFactHandle(Object)

Otherwise, you can either constrain the generic T, or just use an array of FactHandle. (FactHandle is an interface, after all.)  

public static <T extends FactHandle> void remove(WorkingMemory workingMemory, T... array) { 
  if(array == null) return;
  for (T handle : array) {  
    workingMemory.retract(handle);
  } 
}

--- On Tue, 3/17/09, techy <techluver007 at gmail.com> wrote:

> From: techy <techluver007 at gmail.com>
> Subject: [rules-users] ClassCast exception while doing retract
> To: rules-users at lists.jboss.org
> Date: Tuesday, March 17, 2009, 3:04 PM
> Hello,
> My retract util func() is below and ClassCast exception is
> thrown. Some help
> please...
> 
>  public static <T>  void remove(WorkingMemory
> workingMemory,T... array) 
>     { 
>         if(array == null || array.length == 0)
>         {
>             return;
>         }
>     
>         for (int i=0;i<array.length;i++) 
>         { 
>             
>                 workingMemory.retract((FactHandle)
> array[i]); 
>         } 
>              
>     } 
> -- 
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> 
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