问题描述
项目依赖源码打包的时候，会报dubbo.xsd找不到的问题。http://code.alibabatech.com/schema/dubbo/dubbo.xsd读取不到
目录结构
项目目录结构
- dubbo-demo-provider.xml
重现
- 使用如下pom.xml打包
mydubbo-server
${project.build.directory}/classes
src/main/resources
true
**/*.xml
**/*.properties
${project.build.directory}/classes/META-INF/spring
src/main/resources/spring
true
spring-context.xml
org.apache.maven.plugins
maven-jar-plugin
target/classes/
com.alibaba.dubbo.container.Main
false
true
lib/
.
org.apache.maven.plugins
maven-dependency-plugin
copy-dependencies
package
copy-dependencies
jar
jar
false
${project.build.directory}/lib
- 执行构建
mvn clean install - 构建结果:将mydubbo-server.jar和lib目录拷贝到指定的目录下，命令行运行
java -jar mydubbo-server.jar就可以运行dubbo服务了。(注：lib目录下的所有jar包是mydubbo-server.jar的依赖jar)
构建结果
lib
执行jar文件
E:\dubbo\incubator-dubbo\dubbo-demo\dubbo-demo-provider\target> java -jar .\mydubbo-server.jar出现异常
[07/06/18 11:25:35:035 CST] main WARN xml.XmlBeanDefinitionReader: Ignored XML validation warning
org.xml.sax.SAXParseException; lineNumber: 24; columnNumber: 46; 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 。
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.warning(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaErr(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaWarning(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.getSchemaDocument1(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.getSchemaDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.findSchemaGrammar(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.emptyElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:76)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadDocument(XmlBeanDefinitionReader.java:429)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:391)
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.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:252)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:614)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:515)
at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:93)
at com.alibaba.dubbo.container.spring.SpringContainer.start(SpringContainer.java:45)
at com.alibaba.dubbo.container.Main.main(Main.java:85)
原因分析
dubbo的标签都是通过spring.handler文件中配置的对应的namespaceHandler解析，解析时还会去加载http\://code.alibabatech.com/schema/dubbo/dubbo.xsd指向的xsd文件，这个映射是在dubbo的spring.schemas中配置的。由于我们使用的是源码构建的，dubbo的spring.schemas文件是在dubbo-config-spring-2.6.1.jar里（路径dubbo-config-spring-2.6.1.jar\META-INF\spring.schemas,内容是http\://code.alibabatech.com/schema/dubbo/dubbo.xsd=META-INF/dubbo.xsd），
但是spring并不知道这个路径下还有spring.schemas,也就无法加载http\://code.alibabatech.com/schema/dubbo/dubbo.xsd指向的xsd文件，所以spring会报加载不到*.xsd文件的异常。
解决方案
现在的解决方案是将所有的spring.schemas合并在一起，而不用去加载单个jar里面的映射文件。所以我们使用maven的shade插件将所有jar里的spring.schemas文件进行合并，在最终生成的单一jar包里，spring.schemas包含了所有出现过的映射
- pom.xml中新增shade插件
org.apache.maven.plugins
maven-shade-plugin
package
shade
META-INF/spring.handlers
META-INF/spring.schemas
-
打包结果
mydubbo-server.jar\META-INF 查看合并后的文件
mydubbo-server.jar\META-INF\spring.schemas
...
http\://www.springframework.org/schema/aop/spring-aop-2.0.xsd=org/springframework/aop/config/spring-aop-2.0.xsd
http\://www.springframework.org/schema/aop/spring-aop-2.5.xsd=org/springframework/aop/config/spring-aop-2.5.xsd
http\://www.springframework.org/schema/aop/spring-aop-3.0.xsd=org/springframework/aop/config/spring-aop-3.0.xsd
http\://www.springframework.org/schema/aop/spring-aop-3.1.xsd=org/springframework/aop/config/spring-aop-3.1.xsd
http\://www.springframework.org/schema/aop/spring-aop-3.2.xsd=org/springframework/aop/config/spring-aop-3.2.xsd
http\://www.springframework.org/schema/aop/spring-aop-4.0.xsd=org/springframework/aop/config/spring-aop-4.0.xsd
http\://www.springframework.org/schema/aop/spring-aop-4.1.xsd=org/springframework/aop/config/spring-aop-4.1.xsd
http\://www.springframework.org/schema/aop/spring-aop-4.2.xsd=org/springframework/aop/config/spring-aop-4.2.xsd
http\://www.springframework.org/schema/aop/spring-aop-4.3.xsd=org/springframework/aop/config/spring-aop-4.3.xsd
http\://www.springframework.org/schema/aop/spring-aop.xsd=org/springframework/aop/config/spring-aop-4.3.xsd
http\://code.alibabatech.com/schema/dubbo/dubbo.xsd=META-INF/dubbo.xsd
...
- 运行成功
java -jar mydubbo-server.jar
[07/06/18 01:28:29:029 CST] main DEBUG env.PropertySourcesPropertyResolver: Could not find key 'spring.liveBeansView.mbeanDomain' in any property source
[07/06/18 01:28:29:029 CST] main DEBUG support.DefaultListableBeanFactory: Returning cached instance of singleton bean 'lifecycleProcessor'
[07/06/18 01:28:29:029 CST] main INFO container.Main: [DUBBO] Dubbo SpringContainer started!, dubbo version: 2.6.1, current host: 192.168.0.1
[2018-06-07 13:28:29] Dubbo service server started!