问如何克服“java.sql.Clob是一个接口，而JAXB不能处理接口”问题
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Stack Overflow用户

提问于 2011-06-04 16:49:01

回答 1查看 3.4K关注 0票数 2

我正在制作一个class.My上下文newInstance，传递DO as a jaxbcontext DO包含java.sql.clob作为其中一个字段。此clob字段在创建新实例时创建问题。捕获clob时出现异常时出现错误

com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 3 counts of IllegalAnnotationExceptions
java.sql.Clob is an interface, and JAXB can't handle interfaces.
    this problem is related to the following location:
        at java.sql.Clob
        at public java.sql.Clob com.data.subscriber.SubscriberProvTransDO.getXmlString()
        at com.data.subscriber.SubscriberProvTransDO
The type of the getter is java.io.InputStream but that of the setter is long. They have to be the same.
    this problem is related to the following location:
        at public abstract java.io.InputStream java.sql.Clob.getAsciiStream() throws java.sql.SQLException
        at java.sql.Clob
        at public java.sql.Clob com.data.subscriber.SubscriberProvTransDO.getXmlString()
        at com.data.subscriber.SubscriberProvTransDO
    this problem is related to the following location:
        at public abstract java.io.OutputStream java.sql.Clob.setAsciiStream(long) throws java.sql.SQLException
        at java.sql.Clob
        at public java.sql.Clob com.data.subscriber.SubscriberProvTransDO.getXmlString()
        at com.data.subscriber.SubscriberProvTransDO
The type of the getter is java.io.Reader but that of the setter is long. They have to be the same.
    this problem is related to the following location:
        at public abstract java.io.Reader java.sql.Clob.getCharacterStream() throws java.sql.SQLException
        at java.sql.Clob
        at public java.sql.Clob com.data.subscriber.SubscriberProvTransDO.getXmlString()
        at com.data.subscriber.SubscriberProvTransDO
    this problem is related to the following location:
        at public abstract java.io.Writer java.sql.Clob.setCharacterStream(long) throws java.sql.SQLException
        at java.sql.Clob
        at public java.sql.Clob com.data.subscriber.SubscriberProvTransDO.getXmlString()
        at com.data.subscriber.SubscriberProvTransDO

    at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:66)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:389)
    at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:236)
    at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:76)
    at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:618)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:210)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:368)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:522)
    at com.business.system.handler.EventProcessorHandler.insertFailure(EventProcessorHandler.java:286)
    at com.business.system.handler.EventProcessorHandler.processRequest(EventProcessorHandler.java:184)
    at com.business.system.EventProcessorBean.onMessage(EventProcessorBean.java:51)
    at com.ibm.ejs.container.MessageEndpointHandler.invokeMdbMethod(MessageEndpointHandler.java:1086)
    at com.ibm.ejs.container.MessageEndpointHandler.invoke(MessageEndpointHandler.java:773)
    at $Proxy6.onMessage(Unknown Source)
    at com.ibm.ws.sib.api.jmsra.impl.JmsJcaEndpointInvokerImpl.invokeEndpoint(JmsJcaEndpointInvokerImpl.java:201)
    at com.ibm.ws.sib.ra.inbound.impl.SibRaDispatcher.dispatch(SibRaDispatcher.java:768)
    at com.ibm.ws.sib.ra.inbound.impl.SibRaSingleProcessListener$SibRaWork.run(SibRaSingleProcessListener.java:584)
    at com.ibm.ejs.j2c.work.WorkProxy.run(WorkProxy.java:419)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1469)

jaxb

回答 1

Stack Overflow用户

回答已采纳

发布于 2011-06-06 22:52:47

您可以在此用例中使用XmlAdapter。XML适配器会将不可映射的对象java.sql.Clob转换为可映射的对象，如String

ClobAdapter

import java.sql.Clob;

import javax.xml.bind.annotation.adapters.XmlAdapter;

public class ClobAdapter extends XmlAdapter<String, Clob> {

    @Override
    public Clob unmarshal(String v) throws Exception {
        // Convert String to Clob
    }

    @Override
    public String marshal(Clob v) throws Exception {
        // Convert Clob to String
    }

}

根

必须在Clob属性上设置@XmlJavaTypeAdapter。此注释是在XmlAdapter中进行链接的方式

import java.sql.Clob;

import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;

public class Root {

    private Clob clob;

    @XmlJavaTypeAdapter(ClobAdapter.class)
    public Clob getClob() {
        return clob;
    }

    public void setClob(Clob clob) {
        this.clob = clob;
    }

}

演示

import javax.xml.bind.JAXBContext;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(Root.class);
    }
}

有关详细信息的，请访问

票数 3

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/6235733

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