Question

在尝试实例化ObjectFactory时，我在eclipse中遇到以下编译错误：

cannot instantiate the type objectfactory

此编译错误在以下行引发：

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

调用类的完整代码如下：

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();}
    }
}

如何解决此错误？

Answer 1

我的猜测是您导入了错误的ObjectFactory。你可能想要xjc（JAXB相关）生成的那个不是来自javax.naming.spi（JNDI的服务提供者接口）的那个。

修改

javax.xml.bind.JAXBException：＆＃34;生成＆＃34;不包含 ObjectFactory.class或jaxb.index

确保＆＃34;生成＆＃34; package包含ObjectFactory（具有@XmlRegistry批注的那个，而不是javax.naming.spi.ObjectFactory实现）或jaxb.index文件。

您可能可以从代码中删除javax.naming.spi.ObjectFactory，除非您自己实现JNDI实现。

Answer 2

尝试以下

    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.
    }
};

无法实例化objectfactory类型

2 个答案: