我收到類轉換異常 作爲java.lang.ClassCastException:com.model.Image不能轉換爲java.lang.String
java.lang.ClassCastException:com.model.Image不能轉換爲 java.lang.String中
下面是我的功能由一個實體類的JPA
的public List<Image> complete(String fileName)
{
List<Image> queryResult = new ArrayList<Image>();
System.out.println("File Name is : "+fileName);
if (allImages == null)
{
System.out.println("Yeah I am coming here"+allImages);
allImages = imageFacade.findAll();
}
allImages.removeAll(servicesWithImage.getImage());
for (Image image : allImages)
{
if (image.getFileName().toLowerCase().contains(fileName.toLowerCase()))
{
queryResult.add(image);
}
}
return queryResult;
}
創建MySQL表獲取數據
我已經定義了allImages全局作爲
private List<Image> allImages;
上面完整方法我從Primefaces的p:autoComplete
是
<p:autoComplete forceSelection="true"
minQueryLength="3"
value="#{servicesMB.image}"
label="#{msgs.image}"
required="true"
var="image"
itemLabel="#{image.fileName}"
itemValue="#{image}"
completeMethod="#{servicesMB.complete}"
dropdown="true" />
調用完整方法的的findAll方法如下所示:
public List<T> findAll()
{
CriteriaQuery cq = em.getCriteriaBuilder().createQuery();
cq.select(cq.from(entityClass));
return em.createQuery(cq).getResultList();
}
如果我把Print Statement寫成完整的方法,我得到了所有需要的數據bu t對數據沒有在p:autoComplete
顯示,並且還我收到ClassCastException異常
我將編輯我完成上述方法有哪些東西看起來像
public List<Image> complete(String fileName)
{
List<Image> queryResult = new ArrayList<Image>();
if (allImages == null)
{
System.out.println("I am in If Condition");
allImages = imageFacade.findAll();
System.out.println("The Value of allImages : "+allImages);
}
System.out.println("Getter function servicesWithImage"+servicesWithImage.getImage());
allImages.removeAll(servicesWithImage.getImage());
System.out.println("allImages after removeAll method"+allImages);
for (Image image : allImages)
{
if (image.getFileName().toLowerCase().contains(fileName.toLowerCase()))
{
queryResult.add(image);
}
}
System.out.println("At the End The Value of queryResult"+queryResult);
return queryResult;
}
我的輸出(僅用於方法)打印報表:
02:58:56,104 INFO [stdout] (http-localhost-127.0.0.1-8080-5) I am in If Condition
02:58:56,121 INFO [stdout] (http-localhost-127.0.0.1-8080-5) The Value of allImages : [services_2.jpg, services_3.jpg]
02:58:56,122 INFO [stdout] (http-localhost-127.0.0.1-8080-5) Getter function servicesWithImage[]
02:58:56,122 INFO [stdout] (http-localhost-127.0.0.1-8080-5) allImages after removeAll method[services_2.jpg, services_3.jpg]
02:58:56,123 INFO [stdout] (http-localhost-127.0.0.1-8080-5) At the End The Value of queryResult[services_2.jpg, services_3.jpg]
02:58:56,130 SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (http-localhost-127.0.0.1-8080-5)
java.lang.ClassCastException: com.model.Image cannot be cast to java.lang.String
幫助...
花了更多的時間來理解解決方案,但是正確的解決方案非常感謝 – Zaheer 2014-11-15 13:35:38