java - 无法实例化类型 objectfactory

Question

尝试实例化 ObjectFactory 时，我在 Eclipse 中收到以下编译错误:

cannot instantiate the type objectfactory

此编译错误在以下行抛出:

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。您可能想要由 xjc(JAXB 相关)生成的一个，而不是 javax.naming.spi(JNDI 的服务提供者接口(interface))生成的一个。

编辑

javax.xml.bind.JAXBException: "generated" doesnt contain ObjectFactory.class or jaxb.index

确保“生成的”包包含 ObjectFactory(带有 @XmlRegistry 注释的那个，而不是 javax.naming.spi.ObjectFactory 实现)或 jaxb.in​​dex 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。