java.lang.Integer cannot be cast to - ITeye问答
public List&Materials& findAllMaterialsByAppid(Integer appid) {
String hql1 = "select medid from Materials where appid = ? and pid = 0";
List&Materials& list = this.hibernateTemplate.find(hql1, appid);
if (list != null && list.size() & 0) {
if(list.get(0).getMedid() != null){
Integer medid = (Integer)list.get(0).getMedid();
String hql2 = "from Materials where appid = ? and pid = ?";
return this.hibernateTemplate.find(hql2, appid, medid);
请教一下大家
问题补充：java.lang.ClassCastException: java.lang.Integer cannot be cast to com.gorgonor.modules.patients.entity.Materials
at com.gorgonor.modules.patients.dao.impl.MaterialsDaoImpl.findAllMaterialsByAppid(MaterialsDaoImpl.java:43)
at com.gorgonor.modules.patients.service.impl.MaterialsServiceImpl.findAllMaterialsByAppid(MaterialsServiceImpl.java:22)
at com.gorgonor.modules.patients.controller.DiskController.doctorDisk(DiskController.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:212)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
Materials属性
private java.util.D
采纳的***
String hql1 = "from Materials where appid = ? and pid = 0";
你ＳＥＬＥＣＴ　语句中是取　medid
String hql1 = "select medid from Materials where appid = ? and pid = 0";
但实际上你是相取是的Materials　这个对象
这样的转换肯定有问题，
你想要的ＳＱＬ应该是这样的吧：
String hql1 = "select * from Materials where appid = ? and pid = 0";
最好贴完整一点，看看具体是哪一行报错。
不过我猜测一下是不是这行的问题：
Integer medid = (Integer)list.get(0).getMedid();
Integer medid = (Integer)(list.get(0).getMedid());
Integer medid = ((Materials)list.get(0)).getMedid();
Integer medid = (Integer)list.get(0).getMedid(); 应该是这行代码导致的。
Materials中的属性medid是什么数据类型的？
错误贴完整，Materials的各个属性贴上来
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