Question

在编译代码时我得到了上述异常。代码是：

IPAMEmailManagerBean.java -

DAOFactory daoFactory = DAOFactory.getInstance();
PropertyDAO propertyDAO = (PropertyDAO) daoFactory.getDAO("org.hc.cbl.dao.property.PropertyDAO");
StringBuilder aaCategoryCode = new StringBuilder();
PropertyAACategoryCodesTO propertyAACategoryCodesTO = null;
List<String> ahrCategoryCodeList = new ArrayList<String>(Arrays.asList(applicantSavedSearchTO.getAccHousingCatIdStr().split(",")));
List<Long> list = new ArrayList<Long>();
for (String s : ahrCategoryCodeList)
  list.add(Long.valueOf(s));
  System.out.println(list);
  List list1 = propertyDAO.findAHRCategoryCodesByPartnerIdAndCodeList1(applicantSavedSearchTO.getPartnerId(), list); //This line showing class cast exception java.util.ArrayList cannot be cast to java.lang.Long 
  if(list1!=null ){
    for(int i=0;i<list1.size();i++){
      propertyAACategoryCodesTO=(PropertyAACategoryCodesTO)list1.get(i);
      aaCategoryCode.append(propertyAACategoryCodesTO.getAaCategoryCodeDesc()+",");
    }
  }
}

PropertyDAO.java -

public List findAHRCategoryCodesByPartnerIdAndCodeList1(Long partnerId, List strAHRCategoryCode)throws CBLException {
  List AHRCategoryCodesList = null;
  try {
    log.debug("Entering PropertyAACategoryCodeDAO  public List findAHRCategoryCodesByPartnerIdAndCodeList()throws CBLException");
    Query query = HibernateUtil.getSession().createQuery("from PropertyAACategoryCodesTO as propertyAACategoryCodesTO "
    + "where propertyAACategoryCodesTO.partnerTO.partnerId=:partnerId and propertyAACategoryCodesTO.aaCategoryId "
    + "in(:strPropertyTypes) order by propertyAACategoryCodesTO.aaCategoryCodeDesc asc");
    query.setLong("partnerId",partnerId);
    query.setParameter("strPropertyTypes", strAHRCategoryCode);
    query.setCacheable(true);
    AHRCategoryCodesList=query.list();
    HibernateUtil.commitTransaction();
    HibernateUtil.closeSession();
  } catch (Exception ce) {
    ce.printStackTrace();
  }
  log.debug("Exit PropertyAACategoryCodeDAO  public List findAHRCategoryCodesByPartnerIdAndCodeList()throws CBLException");
  return AHRCategoryCodesList;
}

我已经将列表值强制转换，所以原因可能是什么原因。提前谢谢。

Answer 1

它显示异常的原因是PropertyDAO.findAHRCategoryCodesByPartnerIdAndCodeList1（）或它正在调用的方法之一试图将List强制转换为Long。

类强制转换异常：java.lang.ClassCastException：java.util.ArrayList无法强制转换为java.lang.Long

1 个答案: