DUBBO: xml文件无法解析

xml是：

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <dubbo:application name="platform_system_provider" owner="platform_system_provider" organization="llk" logger="slf4j" />


　　...

java

package com.example.test_dubbo;

import org.apache.commons.collections.map.MultiValueMap;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.PropertyValue;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.FileSystemResource;

import java.util.*;

public class DubboXmlDetectorL {

    public static void main(String[] args) {

        String dubboXML = "E:\dev\erdp2\erdp_system\erdp_system_app\src\main\resources\dubbo.xml";
        String dubboXML2 = "E:\dev\ppm\platform_system\02_Src\platform_system\platform_system_provider\src\main\resources\dubbo-provider.xml";
        compareDubboXml(dubboXML, dubboXML2);
    }

    private static void compareDubboXml(String dubboXML, String dubboXML2) {
        System.out.println("left = " + dubboXML);
        Set list1 = getDobboXml(dubboXML);
        System.out.println("right = " + dubboXML2);
        Set list2 = getDobboXml(dubboXML2);

        System.out.println("left = " + list1);
        System.out.println("right = " + list2);

        Set set2 = new HashSet(list1);
        list1.removeAll(list2);
        System.out.println("list111 = " + list1);

        list2.removeAll(set2);
        System.out.println("list222 = " + list2);

    }

    private static Set getDobboXml(String dubboXML) {
        XmlBeanFactory xmlBeanFactory = new XmlBeanFactory(new FileSystemResource(dubboXML));
        String[] beanDefinitionNames = xmlBeanFactory.getBeanDefinitionNames();

        MultiValueMap multiValueMap = new MultiValueMap();
        for (int i = 0; i < beanDefinitionNames.length; i++) {
            String beanDefinitionName = beanDefinitionNames[i];
            BeanDefinition beanDefinition = xmlBeanFactory.getBeanDefinition(beanDefinitionName);
            Class<? extends BeanDefinition> aClass = beanDefinition.getClass();

            Object anInterface = beanDefinition.getAttribute("interface");
//            System.out.println("anInterface = " + anInterface);
            MutablePropertyValues propertyValues = beanDefinition.getPropertyValues();
            PropertyValue anInterface1 = propertyValues.getPropertyValue("interface");

            if (anInterface1 != null) {
                String  interfaceProp = (String) anInterface1.getValue();
                PropertyValue version = propertyValues.getPropertyValue("version");
                PropertyValue group = propertyValues.getPropertyValue("group");

                String key = interfaceProp;//+":"+ (version==null?"":version.getValue())+ ":" + (group==null?"":group.getValue());
                if (multiValueMap.containsKey(key)) {

                }
                multiValueMap.put(key, beanDefinitionName);
            }

        }

        Set set = multiValueMap.entrySet();
        for (Iterator iterator = set.iterator(); iterator.hasNext(); ) {
            Object entry =  iterator.next();
            if (entry instanceof Map.Entry) {
                ArrayList value = (ArrayList) ((Map.Entry) entry).getValue();
                if (value.size() > 1) {
                    System.out.println("                   = " + entry );
                }
            }
        }

        return multiValueMap.keySet();
    }

    private static void test1() {
        String xmls = "E:\dev\erdp2\erdp_discuss\erdp_discuss_app\src\main\resources\dubbo.xml
" +
                "E:\dev\erdp2\erdp_doc\erdp_doc_app\src\main\resources\dubbo.xml
" +
                "E:\dev\erdp2\erdp_project\erdp_project_app\src\main\resources\dubbo.xml
" +
                "E:\dev\erdp2\erdp_scheduler\erdp_scheduler_app\src\main\resources\dubbo.xml
" +
                "E:\dev\erdp2\erdp_system\erdp_system_app\src\main\resources\dubbo.xml
" +
                "E:\dev\erdp2\erdp_workflow\erdp_workflow_app\src\main\resources\dubbo.xml";
        String[] split = xmls.split("
");
        for (int i = 0; i < split.length; i++) {
            String s = split[i];
            System.out.println("XML = " + s);
            detectDobboXml(s);
        }

        String dubboXML = "E:\dev\erdp2\erdp_doc\erdp_doc_app\src\main\resources\dubbo.xml";
        dubboXML = "dubbo.xml";
        dubboXML = "E:\dev\erdp2\test_nacos\src\test\java\dubbo.xml";
//        detectDobboXml(dubboXML);
    }

    private static void detectDobboXml(String dubboXML) {
        XmlBeanFactory xmlBeanFactory = new XmlBeanFactory(new FileSystemResource(dubboXML));
        String[] beanDefinitionNames = xmlBeanFactory.getBeanDefinitionNames();

//        DefaultListableBeanFactory bdr = new DefaultListableBeanFactory();
//        bdr.set
//        XmlBeanDefinitionReader xmlBeanDefinitionReader = new XmlBeanDefinitionReader(bdr);
//        NamespaceHandlerResolver namespaceHandlerResolver = xmlBeanDefinitionReader.getNamespaceHandlerResolver();
//        System.out.println("namespaceHandlerResolver = " + namespaceHandlerResolver);
//        NamespaceHandlerResolver nsr = new DefaultNamespaceHandlerResolver();
//        xmlBeanDefinitionReader.setNamespaceHandlerResolver(nsr);

        MultiValueMap multiValueMap = new MultiValueMap();
        for (int i = 0; i < beanDefinitionNames.length; i++) {
            String beanDefinitionName = beanDefinitionNames[i];
//            System.out.println("beanDefinitionName = " + beanDefinitionName);
            BeanDefinition beanDefinition = xmlBeanFactory.getBeanDefinition(beanDefinitionName);
//            System.out.println("beanDefinition = " + beanDefinition);
            Class<? extends BeanDefinition> aClass = beanDefinition.getClass();

            Object anInterface = beanDefinition.getAttribute("interface");
//            System.out.println("anInterface = " + anInterface);
            MutablePropertyValues propertyValues = beanDefinition.getPropertyValues();
            PropertyValue anInterface1 = propertyValues.getPropertyValue("interface");
//            System.out.println("anInterface1 = " + anInterface1);
//            propertyValues.getPropertyValueList();

            if (anInterface1 != null) {
                String  interfaceProp = (String) anInterface1.getValue();
                PropertyValue version = propertyValues.getPropertyValue("version");
                PropertyValue group = propertyValues.getPropertyValue("group");

                String key = interfaceProp+":"+ (version==null?"":version.getValue())+ ":" + (group==null?"":group.getValue());
//            System.out.println("aClass = " + aClass);
                if (multiValueMap.containsKey(key)) {
//                    multiValueMap.put(interfaceProp, beanDefinitionName);
//                    System.out.println("beanDefinitionName = " + beanDefinitionName + " interface = " + interfaceProp);
//                    System.out.println(" interface = " + interfaceProp + "  beanDefinitionNames = " + multiValueMap.get(interfaceProp));
                }
                multiValueMap.put(key, beanDefinitionName);
//                multiValueMap.put(interfaceProp, aClass);
            }

        }

//        Object dubbo = xmlBeanFactory.getBean("dubbo");
//        System.out.println("dubbo = " + dubbo);
//        BeanDefinition dubbo1 = xmlBeanFactory.getBeanDefinition("dubbo");
//        System.out.println("dubbo1 = " + dubbo1.getClass());

        Set set = multiValueMap.entrySet();
        for (Iterator iterator = set.iterator(); iterator.hasNext(); ) {
            Object entry =  iterator.next();
//            System.out.println("entry = " + entry + " v " + multiValueMap.get(entry));
            if (entry instanceof Map.Entry) {
                ArrayList value = (ArrayList) ((Map.Entry) entry).getValue();
//                System.out.println("value = " + value.size());
                if (value.size() > 1) {
                    System.out.println("                   = " + entry );
                }
            }
//            Collection collection = multiValueMap.getCollection(entry);
//            if (collection != null && collection.size() > 1) {
//                System.out.println("key = " + entry);
//                dumpCollection(collection);
//            }
        }

//        Collection values = multiValueMap.values();
//        System.out.println("values = " + values);
    }

    private static void dumpCollection(Collection values) {
        for (Iterator iterator = values.iterator(); iterator.hasNext(); ) {
            Object next = iterator.next();
            System.out.println("next = " + next);
        }
    }

    private static void test() {
        String dubboXML = "E:\dev\erdp2\erdp_doc\erdp_doc_app\src\main\resources\dubbo.xml";
        dubboXML = "dubbo.xml";
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                new String[]{dubboXML});
        context.start();

        ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
        String[] beanDefinitionNames = beanFactory.getBeanDefinitionNames();
        for (int i = 0; i < beanDefinitionNames.length; i++) {
            String beanDefinitionName = beanDefinitionNames[i];
            System.out.println("beanDefinitionName = " + beanDefinitionName);
        }
    }
}

出现错误：dubbo  通配符的匹配很全面, 但无法找到元素 'dubbo:service' 的声明。

10:05:44.125 [main] WARN  o.s.b.f.xml.XmlBeanDefinitionReader - Ignored XML validation warning
org.xml.sax.SAXParseException: schema_reference.4: 无法读取方案文档 'http://code.alibabatech.com/schema/dubbo/dubbo.xsd', 原因为 1) 无法找到文档; 2) 无法读取文档; 3) 文档的根元素不是 <xsd:schema>。
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.warning(ErrorHandlerWrapper.java:99)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:392)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:306)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaErr(XSDHandler.java:4158)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaWarning(XSDHandler.java:4149)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.getSchemaDocument1(XSDHandler.java:2491)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.getSchemaDocument(XSDHandler.java:2193)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:578)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:610)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.findSchemaGrammar(XMLSchemaValidator.java:2447)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1768)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.emptyElement(XMLSchemaValidator.java:761)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:351)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2784)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339)
    at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:77)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadDocument(XmlBeanDefinitionReader.java:434)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
    at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:79)
    at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:67)
    at com.example.test_nacos.DetectorL.detectDobboXml(DetectorL.java:43)
    at com.example.test_nacos.DetectorL.main(DetectorL.java:33)
Caused by: java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
    at sun.net.www.http.HttpClient.New(HttpClient.java:339)
    at sun.net.www.http.HttpClient.New(HttpClient.java:357)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
    at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:647)
    at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:148)
    at com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaParsingConfig.parse(SchemaParsingConfig.java:583)
    at com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaParsingConfig.parse(SchemaParsingConfig.java:686)
    at com.sun.org.apache.xerces.internal.impl.xs.opti.SchemaDOMParser.parse(SchemaDOMParser.java:530)
    at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.getSchemaDocument(XSDHandler.java:2181)
    ... 24 common frames omitted
Exception in thread "main" org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 8 in XML document from file [E:deverdp2erdp_discusserdp_discuss_appsrcmain
esourcesdubbo.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 8; columnNumber: 51; cvc-complex-type.2.4.c: 通配符的匹配很全面, 但无法找到元素 'dubbo:application' 的声明。
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:404)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
    at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:79)
    at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:67)
    at com.example.test_nacos.DetectorL.detectDobboXml(DetectorL.java:43)
    at com.example.test_nacos.DetectorL.main(DetectorL.java:33)
Caused by: org.xml.sax.SAXParseException; lineNumber: 8; columnNumber: 51; cvc-complex-type.2.4.c: 通配符的匹配很全面, 但无法找到元素 'dubbo:application' 的声明。
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:453)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3231)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1912)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.emptyElement(XMLSchemaValidator.java:761)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:351)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2784)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339)
    at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:77)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadDocument(XmlBeanDefinitionReader.java:434)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)
    ... 6 more

启动过程中，感觉会去下载，但是下载了好一会却下载不成功。。

其实 Spring提供了一种机制，默认从本地加载XSD文件 。仔细检查，好像命名空间有问题， 是dubbo从2.6.5升级到 2.7.1 引起的吗？ code.alibabatech.com 改成 dubbo.apache.org ，还是不行：

Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]

Exception in thread "main" org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]
Offending resource: file [E:deverdp2erdp_systemerdp_system_appsrcmain
esourcesdubbo.xml]

    at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:72)
    at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:119)
    at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:111)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:281)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1363)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1352)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:179)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:149)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:96)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:513)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:393)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
    at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:79)
    at org.springframework.beans.factory.xml.XmlBeanFactory.<init>(XmlBeanFactory.java:67)
    at com.example.test_nacos.DetectorL.getDobboXml(DetectorL.java:42)
    at com.example.test_nacos.DetectorL.compareDubboXml(DetectorL.java:25)
    at com.example.test_nacos.DetectorL.main(DetectorL.java:20)

想起来了之前读spring源码的时候， 对应于每一个xml 的命名空间，spring 都需要一个NamespaceHandler，比如Context需要  ContextNamespaceHandler  。
难道要修改jar 的spring.handlers/spring.schemas 文件？ 检查 spring-context-5.1.5.RELEASEMETA-INFspring.handlers ，发现基本正常

http://www.springframework.org/schema/context=org.springframework.context.config.ContextNamespaceHandler
http://www.springframework.org/schema/jee=org.springframework.ejb.config.JeeNamespaceHandler
http://www.springframework.org/schema/lang=org.springframework.scripting.config.LangNamespaceHandler
http://www.springframework.org/schema/task=org.springframework.scheduling.config.TaskNamespaceHandler
http://www.springframework.org/schema/cache=org.springframework.cache.config.CacheNamespaceHandler

突然想到，dubbo-jar 都没有引入呢！

        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.7.1</version>
        </dependency>

加入就好了！

------------------------------------------------------------------------------------------------------------------------------------------------
总结一下

这样的问题，通常是由于升级引起的，特别是有些jar升级后不兼容之前的版本就会出现。
但Spring很贴心，把旧版本的XSD文件也全放了。这样可以防止升级了Spring版本，而配置文件里用的还是旧版本的XSD文件，然后断网了，应用启动不了。

我解压dubbo jar之后看到spring-context-5.1.5.RELEASEMETA-INFspring.schemas ：

可见，基本上都有了。但是xsd 只有一个：

所以，如果用最新的jar ，然后xml配置老的 命名空间，那么还是会去下载xsd。下载

参考
https://dslztx.github.io/blog/2019/02/20/Unable-to-locate-Spring-NamespaceHandler-for-XML-schema-namespace/
https://www.jianshu.com/p/b16a4384dfdb
https://blog.csdn.net/wcf2010/article/details/86229222
https://blog.csdn.net/wxydaisy/article/details/40650405