最近项目要用到JMS，因为用tomcat容器，所以采用了开源的ActiveMQ 消息中间件提供JMS支持。但是在spring2.5和activemq5.2集成的时候出现了点问题，首先列出activemq-import-beans.xml的内容：
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:amq="http://activemq.org/config/1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://activemq.org/config/1.0 http://activemq.apache.org/schema/core/activemq.xsd">运行测试程序出现以下异常：
Caused by: org.xml.sax.SAXParseException: TargetNamespace.1: Expecting namespace 'http://activemq.org/config/1.0', but the target namespace of the schema document is 'http://activemq.apache.org/schema/core'. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384) at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.reportSchemaError(XSDHandler.java:2525) at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.constructTrees(XSDHandler.java:768) at com.sun.org.apache.xerces.internal.impl.xs.traversers.XSDHandler.parseSchema(XSDHandler.java:569) at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.loadSchema(XMLSchemaLoader.java:552) at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.findSchemaGrammar(XMLSchemaValidator.java:2408) at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1753) at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:685) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:400) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2740) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:645) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:508) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:225) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283) at org.springframework.beans.factory.xml.DefaultDocumentLoader.loadDocument(DefaultDocumentLoader.java:75) at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:396) ... 22 more
通过阅读异常信息发现时XSD名称空间不对，所以赶紧打开activemq-core-5.2.0.jar/META-INF/目录中的spring.schemas查看，发现"http\://activemq.apache.org/schema/core/activemq-core.xsd=activemq.xsd"
于是乎又打开activemq.xsd查个究竟，以下为activemq5.2的activemq.xsd文件一部分：
<xs:schema elementFormDefault='qualified' targetNamespace='http://activemq.apache.org/schema/core' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:tns='http://activemq.apache.org/schema/core'>
噢，原来目标名称空间不一致啊。于是赶紧去改activemq-import-beans.xml文件的配置，修改如下：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance xmlns:amq="http://activemq.apache.org/schema/core" //这个地方很关键，amq对应的XSD名称空间名称要和activemq.xsd的一致 xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq.xsd">
呵呵，到这里以为问题已经搞定，但是运行测试后，又发现一个新的问题，异常信息如下：
org.xml.sax.SAXParseException: schema_reference.4: Failed to read schema document 'http://activemq.apache.org/schema/core/activemq.xsd', because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
查看了异常信息后，发现可能是spring无法定位到http://activemq.apache.org/schema/core/activemq.xsd,于是又一次打开activemq-core-5.2.0.jar/META-INF的spring.schemas，内容如下：
http\://activemq.org/config/1.0=activemq.xsd http\://activemq.org/config/1.0/1.0.xsd=activemq.xsd http\://activemq.apache.org/schema/core=activemq.xsd http\://activemq.apache.org/schema/core/activemq-core.xsd=activemq.xsd呵呵，发现问题了吗？初看没啥问题，但是仔细一看，噢，原来http\://activemq.apache.org/schema/core/activemq-core.xsd=activemq.xsd 与http://activemq.apache.org/schema/core/activemq.xsd 不匹配，呵呵，知道问题根源了，现在时解决办法，解决办法有两种：
第一种：修改activemq-import-beans.xml文件的“http://activemq.apache.org/schema/core/activemq.xsd ”这句为：http://activemq.apache.org/schema/core/activemq-core.xsd（这个就是activemq jar包中spring.schemas文件的最后一行，但是注意：http\://要改为http://)
第二种：在classpath目录中，新建META-INF/spring.schemas文件，然后增加一下内容：
http\://activemq.apache.org/schema/core/activemq-core.xsd=activemq.xsd这个时候重新运行测试，发现一切OK。哈。。
相关资源：敏捷开发V1.0.pptx
