無法實例類型的ObjectFactory

Question

試圖實例一個ObjectFactory當我得到在eclipse下面的編譯錯誤：

cannot instantiate the type objectfactory 

此編譯錯誤是在下面的行拋出：

objectFactory = new ObjectFactory();//throws error: "Cannot instantiate the type ObjectFactory" 

完整代碼爲如下呼叫類別：

package maintest; 

import java.io.File; 
import javax.naming.spi.ObjectFactory; 
import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBElement; 
import javax.xml.bind.JAXBException; 
import javax.xml.bind.Unmarshaller; 

public class Main { 

    private static JAXBContext context; 
    private static ObjectFactory objectFactory; 

    public static void main(String[] args) { 
     try {setUp();} catch (Exception e) {e.printStackTrace();} 
     unmarshal(); 
    } 

    protected static void setUp() throws Exception { 
     context = JAXBContext.newInstance("generated"); 
     objectFactory = new ObjectFactory();//throws error: "Cannot instantiate the type ObjectFactory" 
    } 

    public static <PurchaseOrderType> void unmarshal(){ 
     Unmarshaller unmarshaller; 
     try { 
      unmarshaller = context.createUnmarshaller(); 
      final Object object = unmarshaller.unmarshal(new File("src/test/samples/po.xml")); 
     } catch (JAXBException e) {e.printStackTrace();} 
    } 
} 

如何解決此錯誤？

Answer 1

我的猜測是，你輸入了錯誤的ObjectFactory。您可能希望由xjc（JAXB related）生成的不是來自javax.naming.spi（JNDI的服務提供者接口）的生成的。

編輯

javax.xml.bind.JAXBException： 「生成的」 犯規含有 ObjectFactory.class或jaxb.in​​dex

確保 「產生」 包包含無論是ObjectFactory（帶有@XmlRegistry註釋的對象，不是javax.naming.spi.ObjectFactory實現）或jaxb.in​​dex文件。

你也許可以從代碼中刪除javax.naming.spi.ObjectFactory，除非你實現自己一個JNDI實現。

Answer 2

請嘗試以下

import javax.naming.spi.ObjectFactory; 
    import javax.naming.Context; 
    import javax.naming.Name; 
    import java.util.Hashtable; 

    ObjectFactory objFactory = new ObjectFactory() { 

    @Override 
    public Object getObjectInstance(Object o, Name name, Context cntxt, Hashtable<?, ?> hshtbl) throws Exception { 
     throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. 
    } 
};