尝试从列表中删除元素时出现ConcurrentModificationException

Question

嗯，我已经阅读了其他帖子，无法解决我的问题。我的ManagedBean中有一个dataTable（JSF）绑定。我有选择的要素的列表，我想删除这个元素，请参阅：

public void removeSelected() { 

    for (Map.Entry<Integer, Boolean> entry : registrosSelecionados.entrySet()){ 
     if (entry.getValue() == true){ 
      int id = entry.getKey(); 
      Iterator<Bean> it = beans.iterator(); 
      while(it.hasNext()){ 
      Bean b = it.next(); 
      if (b.getId().equals(id)){ 
       setBean(b); 
       deletar(); 
      } 
      } 
     } 
    } 
    } 

我上面调用另一个名为法“deletar（）”方法，请参阅：

public void deletar() { 
    try { 


     //Se o bean for nulo então capturamos o bean selecionado no DataTable, se este existir 
     if (bean == null){ 
     if (dataTable == null){ 
      throw new RuntimeException("O bean é nulo e não há dataTable vinculado ao ManagedBean. A deleção será abortada"); 
     } 
     bean = (Bean) dataTable.getRowData(); 
     } 

     beforeRemove(); 
     getBoPadrao().delete((AbstractBean) bean); 
     addInfoMessage("Registro deletado com sucesso"); 
     beans.remove(bean); 
     bean = null; 
     afterRemove(); 
    } catch (BOException e) { 
     addErrorMessage(e.getMessage()); 
     FacesContext.getCurrentInstance().validationFailed(); 
    } catch (Exception e) { 
     e.printStackTrace(); 
     logger.error((new StringBuilder()).append("Erro ao deletar: ") 
      .append(e.getMessage()).toString()); 
     FacesContext.getCurrentInstance().validationFailed(); 
     addErrorMessage((new StringBuilder()).append("Erro ao deletar. ") 
      .append(e.getMessage()).toString()); 
    } 
    } 

的豆是从删除数据库但当尝试从“目录”中删除我得到错误：

Jan 31, 2015 5:38:32 PM com.sun.faces.context.AjaxExceptionHandlerImpl handlePartialResponseError 
Grave: java.util.ConcurrentModificationException 
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859) 
    at java.util.ArrayList$Itr.next(ArrayList.java:831) 
    at br.com.jwebbuild.mb.BasicCrudMBImpl.removeSelected(BasicCrudMBImpl.java:226) 

编辑1

我试着编辑我的deletar（）方法把一个迭代器删除元素，但没有工作，错误继续。

public void deletar() { 
    try { 


     //Se o bean for nulo então capturamos o bean selecionado no DataTable, se este existir 
     if (bean == null){ 
     if (dataTable == null){ 
      throw new RuntimeException("O bean é nulo e não há dataTable vinculado ao ManagedBean. A deleção será abortada"); 
     } 
     bean = (Bean) dataTable.getRowData(); 
     } 

     beforeRemove(); 
     getBoPadrao().delete((AbstractBean) bean); 
     addInfoMessage("Registro deletado com sucesso"); 

     Iterator<Bean> it = beans.iterator(); 
     while (it.hasNext()) { 
     Bean b = it.next(); 
     if (b.equals(bean)) { 
      it.remove(); 
     } 
     } 

     bean = null; 
     afterRemove(); 

Answer 1

幽州，

Well, i already read the others posts and can't solve my problem.

如果你读过其他类似的职位，那么你应该已经知道了，你只能用删除迭代，东西你不这样做，这正是你必须做的。

例如，

public void deltar(Iterator<Bean> it, Bean bean) { 
    // ..... 
    it.remove(); 
}