memory leak: which is better?

hi guys

which is better? case1 or case2. will any of them cause memory leaks?

case1
public class ManagerBusinessService extends BaseBusinessService{//defined globally
//defined globally
private Workflow workflow;
private WorkflowDTO worflowDTO = null;

private WorkflowDao workflowDao;
public void setWorkflowDao(WorkflowDao workflowDao) {
this.workflowDao = workflowDao;
}

public WorkflowDTO fetchDetailsTx(String Id){                   
int workflowId = 0;            
flexworkfloId = getWorkflowNumbers(Id);                  
workflow = workflowDao.loadWorkflowDetailsTx(flexworkfloId);      
worflowDTO = WorkflowDetailAdapter.getInstance().transformDbModelToDTO(workflow);            }
return worflowDTO;
}
...

case2
public class ManagerBusinessService extends BaseBusinessService{
private WorkflowDao workflowDao;
public void setWorkflowDao(WorkflowDao workflowDao) {
this.workflowDao = workflowDao;
      }

      
public WorkflowDTO fetchDetailsTx(String Id){
//defined locally
Workflow workflow;
WorkflowDTO worflowDTO = null;                   
int workflowId = 0;            
flexworkfloId = getWorkflowNumbers(Id);                  
workflow = workflowDao.loadWorkflowDetailsTx(flexworkfloId);      
worflowDTO = WorkflowDetailAdapter.getInstance().transformDbModelToDTO(workflow);      
}
return worflowDTO;
}
...