what's wrong with my Entry?

i 'm being use the jini 2.0 (outrigger)

when i try to take my entry, i get a 

Transaction: net.jini.core.transaction.server.ServerTransaction
[manager=com.sun.jini.mahalo.TxnMgrProxy$ConstrainableTxnMgrProxy@4e87e98d,
id=-598171133175857004]
	at com.sun.jini.outrigger.SpaceProxy.entryFrom(SpaceProxy.java:556)
	at com.sun.jini.outrigger.SpaceProxy.take(SpaceProxy.java:420)
	at framework.TaskMonitor.monitoring(TaskMonitor.java:77)
	at framework.TaskMonitor.run(TaskMonitor.java:38)


i was defined my entry as here (the comments are in portuguese): 



public interface Task extends Entry 
{
	AbstractResult execute();
	

}






                                                                              
public abstract class AbstractTask implements Task, Runnable,Framework
{
	
	
    public Uuid groupUuid;
	
    public Long taskId;
    
    
    public Boolean processed = new Boolean (false);

    
	public  JavaSpace space; 
	
	public  Transaction txn;
    

	public AbstractResult result;
	public Double java_specification_version;	
	
	public void run()
	{
		long ti = System.currentTimeMillis();
		result = execute();
		long tf = System.currentTimeMillis();
		if (result != null)
		{			
			
			this.result.time = new Long (tf - ti); 
			
			try
			{
				space.write(result,null,FOREVER);
			}
			catch (Exception e)
			{
				e.printStackTrace();
				try
				{
					txn.abort();
					
				}
				catch (Exception ex)
				{
					e.printStackTrace();
				}
				
			}
		}		
	}
	public abstract AbstractResult execute();
}	




public class GenericTask extends AbstractTask
{
	
	public GenericTask()
	{
		
	}
	public AbstractResult execute()
	{
		
		throw new RuntimeException("Método execute() não implementado.");
	}
}






public class TaskPrimos extends GenericTask
{

    public ResultPrimos resultado;    
    public Integer length;
    public Integer [] nums;
    public Integer [] primos;
    public Integer quant=new Integer(0);
    
    public TaskPrimos()
    {
        
    }
    public TaskPrimos(Integer nums[])
    {
         this.length = new Integer(nums.length);
         this.nums = nums;
         
    }
    
    public Boolean isPrime(int num)
    {
        double raiz = Math.sqrt(num); 
        
        for (int i=2;i<=raiz;i++)
        {
            if (num % i == 0)
            {
                return new Boolean (false);                
            }
            
        }
        return new Boolean (true);        
    }

    public AbstractResult execute()
    {       
        
        int j=0;
        ResultPrimos resultado = new ResultPrimos();
        
        for (int i=0;i<length.intValue();i++)
        {
            if (isPrime(nums[i].intValue()).booleanValue())
            {
                primos[j++] = nums[i];                
                quant = new Integer(j);
            }            
        }
        System.out.println("passou por aqui");
        resultado.quant = quant;
        resultado.primos = primos;  
                
        return resultado;
    }

}

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