Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/sc

本文解决了一个关于Spring AOP在WSO2企业服务总线(ESB)部署环境中遇到的问题,具体表现为无法找到指定的Spring命名空间处理器。通过调整依赖项的优先级或将必要的配置文件添加到特定的jar包中解决了这一问题。

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I m using Spring AOP architecture for Logging and Transaction management.we are using WSO2-ESB container for deploying our service. Here the XML file which we try to read usingClassPathXmlApplicationContext().

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
xmlns:aop="http://www.springframework.org/schema/aop" 
xmlns:context="http://www.springframework.org/schema/context" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:tx="http://www.springframework.org/schema/tx" 
xsi:schemaLocation="http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.2.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
<!-- Complete AOP implementation -->
    <aop:aspectj-autoproxy />
    <!-- Aspect -->
    <bean id="logAspect" class="x.y.z.logging.aspect.LoggingAspect" />
    <aop:config>
        <aop:aspect id="aspectLoggging" ref="logAspect" >
        <!-- @Before -->
            <aop:pointcut id="pointCutBefore"
                expression="execution(* *(..))" />
            <aop:before method="logBefore" pointcut-ref="pointCutBefore" />
            <!-- @After -->
            <aop:pointcut id="pointCutAfter"
                expression="execution(* *(..))" />
            <aop:after method="logAfter" pointcut-ref="pointCutAfter" />
            <!-- @AfterReturning -->
            <aop:pointcut id="pointCutAfterReturning"
                expression="execution(* *(..))" />
            <aop:after-returning method="logAfterReturning" returning="result" 
                pointcut-ref="pointCutAfterReturning" />
            <!-- @AfterThrowing -->
            <aop:pointcut id="pointCutAfterThrowing"
                expression="execution(* *(..))" />
            <aop:after-throwing method="logAfterThrowing" throwing="error" 
                pointcut-ref="pointCutAfterThrowing"  />
        </aop:aspect>
    </aop:config>
</beans>

Actual problem occurred when i start my WSO2-ESB server. Here i have attached Stacktrace :

Caused by: org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/aop]
Offending resource: file [C:\WSO2\Temp\WSO2ES~1.0\.\repository\conf\bundle-config\logger-aspect.xml]

    at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
    at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
    at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:80)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:316)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1416)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1409)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:184)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:140)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:111)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:174)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:209)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:243)
    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:131)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:522)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:436)
    at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:140)
    at org.springframework.context.support.FileSystemXmlApplicationContext.<init>(FileSystemXmlApplicationContext.java:84)
    at com.mi.logging.core.SpringLoggerUtil.setApplicationContext(SpringLoggerUtil.java:37)
    at com.mi.logging.aspect.activator.LogAspectActivator.start(LogAspectActivator.java:16)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
    ... 9 more

I m using spring.3.2.5 version and I have reassured that all dependent jar are on classpath. Please help to resolve this issue. If you have any suggestion or solution then please let me know. Thnx in advance.

share improve this question
 
 
I would say that there is no spring-aop.jar (or wrong version) on the classpath. Or it isn't readable. –  M. Deinum  Jan 20 '14 at 9:39
 
spring-aop-3.2.5.RELEASE.jar is in the classpath and have the correct version. If you have any reference or samples of Spring AOP implementation in WSO2-ESB then please share it. –  Tejas Patel  Jan 20 '14 at 10:31
 
When is it on the classpath, during building or during deployment? –  M. Deinum  Jan 20 '14 at 11:13
 
we have used Maven for dependency management, so at build time osgi bundle resolve dependency from maven repository.But while deployment time, WSO2 ESB container provide the required jar files so it resolve dependency from there. I m using the same version at both side. –  Tejas Patel  Jan 20 '14 at 11:55

1 Answer

up vote 0 down vote accepted

This problem occurred due to it can't find the path/location of spring-aop-3.0.xsd fromspring.framework_3.1.0.wso2v1.jar, which is provided by the WSO2-ESB.
It can be resolved by two ways : 
1) You can add your latest version of spring and set the priority of that jar files.
Reference

2) You have to just simply follow the steps described below. You have to add some files into META-INF folder of spring.framework_3.1.0.wso2v1.jar file.
Steps are shown below. 
i) Create a new file spring.schemas and add the content shown below.

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.xsd=org/springframework/aop/config/spring-aop-3.2.xsd

ii) Create a new file spring.handlers and add the content shown below.

http\://www.springframework.org/schema/aop=org.springframework.aop.config.AopNamespaceHandler

iii) Create a new file spring.tooling and add the content shown below.

# Tooling related information for the aop namespace
http\://www.springframework.org/schema/aop@name=aop Namespace
http\://www.springframework.org/schema/aop@prefix=aop
http\://www.springframework.org/schema/aop@icon=org/springframework/aop/config/spring-aop.gif
share improve this answer
 

<think>好的,我现在遇到了一个Spring的错误:“Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]”。我需要解决这个问题。让我仔细想想可能的原因和解决办法。 首先,这个错误通常发生在Spring配置文件中使用了自定义的命名空间,但相关的处理器没有正确配置或依赖缺失。Dubbo的命名空间处理器负责解析XML中的dubbo标签,比如<dubbo:service>等。如果Spring找不到这个处理器,就会抛出这个错误。 可能的原因有几个: 1. **缺少Dubbo的依赖**:项目中没有引入Dubbo的相关库,或者版本不兼容。需要检查pom.xml或build.gradle文件中是否包含了正确的Dubbo依赖。 2. **XML命名空间配置错误**:可能在Spring的配置文件中,Dubbo的命名空间URI写错了。需要确认是否正确引用了Dubbo的schema,比如http://dubbo.apache.org/schema/dubbo。 3. **Spring的版本兼容性问题**:Dubbo可能和当前使用的Spring版本不兼容,需要检查版本是否匹配。 接下来,我应该逐一排查这些问题。首先,检查项目的依赖管理文件,比如Maven的pom.xml,确保已经添加了Dubbo的依赖。常见的依赖包括dubbo-spring-boot-starter,或者传统的dubbo依赖和spring的整合模块。例如: ```xml <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>2.7.8</version> </dependency> ``` 或者如果没有使用Spring Boot的话,可能需要: ```xml <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo</artifactId> <version>2.7.8</version> </dependency> ``` 同时,还需要确保注册中心相关的依赖,比如Zookeeper客户端: ```xml <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-recipes</artifactId> <version>4.3.0</version> </dependency> ``` 如果依赖没问题,那么检查XML配置文件中的命名空间声明是否正确。例如,Dubbo的命名空间应该这样声明: ```xml <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd"> ``` 这里要确认xsi:schemaLocation部分是否正确指定了dubbo的xsd位置,有时候网络问题可能导致无法下载xsd文件,但通常Spring会使用本地的jar包中的xsd,所以可能还是依赖的问题。 另外,如果是Spring Boot项目,可能需要检查是否使用了正确的自动配置。有时候,可能需要添加@EnableDubbo注解或者在application.properties中配置dubbo的相关属性。 如果以上步骤都没问题,可能需要检查依赖冲突。比如,项目中可能有不同版本的Dubbo依赖,或者Spring的版本过低。例如,Dubbo 2.7.x需要Spring 4.3以上版本。如果项目中的Spring版本太旧,可能不兼容。 还有一种可能是在打包部署时,Dubbo的配置文件没有正确包含进去,比如Maven的resources配置遗漏了XML文件,导致Spring启动时找不到配置。不过这个错误信息更可能指向命名空间处理器的缺失,而不是配置文件本身的问题。 总结一下,解决步骤应该是: 1. 检查并添加正确的Dubbo依赖。 2. 确认XML配置文件中的命名空间和schemaLocation正确。 3. 确保没有版本冲突,特别是Spring和Dubbo的版本兼容性。 4. 清理并重新构建项目,确保所有依赖正确下载和包含。 如果问题依旧存在,可能需要查看更详细的日志,确认类路径下是否存在dubbo的jar包,以及其中的META-INF/spring.handlers和META-INF/spring.schemas文件是否正确配置了命名空间处理器和schema。有时候,某些打包方式(比如uber-jar)可能会覆盖这些文件,导致Spring找不到正确的处理器。这时候需要检查构建插件是否有适当的配置来合并这些资源文件。</think>当在Spring项目中遇到错误“Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]”时,通常是因为**Dubbo的XML命名空间处理器未正确加载**。以下是逐步排查和解决方案: --- ### 1. **检查Dubbo依赖** - **原因**:项目可能未引入Dubbo的依赖,或版本不兼容。 - **解决方案**: - 在Maven的`pom.xml`中添加Dubbo核心依赖(根据项目类型选择): ```xml <!-- 非Spring Boot项目 --> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo</artifactId> <version>2.7.15</version> <!-- 确保使用稳定版本 --> </dependency> <!-- Spring Boot项目 --> <dependency> <groupId>org.apache.dubbo</groupId> <artifactId>dubbo-spring-boot-starter</artifactId> <version>2.7.15</version> </dependency> ``` - 同时添加注册中心依赖(如Zookeeper): ```xml <dependency> <groupId>org.apache.curator</groupId> <artifactId>curator-recipes</artifactId> <version>5.1.0</version> </dependency> ``` --- ### 2. **确认XML配置正确性** - **原因**:XML中Dubbo的命名空间声明或`schemaLocation`错误。 - **解决方案**: - 检查Spring配置文件(如`applicationContext.xml`),确保命名空间和`schemaLocation`正确: ```xml <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd"> ``` --- ### 3. **检查版本兼容性** - **原因**:Dubbo与Spring版本不兼容。 - **解决方案**: - Dubbo 2.7.x需要Spring 4.3+,Dubbo 3.x需要Spring 5+。 - 确保项目中Spring的版本符合要求(如Spring 5.2.22.RELEASE)。 --- ### 4. **处理依赖冲突** - **原因**:其他依赖可能与Dubbo的库冲突。 - **解决方案**: - 使用Maven命令检查依赖树: ```bash mvn dependency:tree -Dincludes=org.apache.dubbo ``` - 排除冲突的依赖(例如旧版本的Dubbo或Netty)。 --- ### 5. **验证资源文件打包** - **原因**:构建时未正确包含Dubbo的`spring.schemas`和`spring.handlers`。 - **解决方案**: - 在Maven的`pom.xml`中确保资源文件被正确包含: ```xml <build> <resources> <resource> <directory>src/main/resources</directory> <filtering>true</filtering> <!-- 合并所有依赖中的META-INF/spring配置 --> <includes> <include>**/*.xml</include> <include>META-INF/spring/*</include> </includes> </resource> </resources> </build> ``` --- ### 6. **清理并重新构建** - **原因**:旧的编译文件或缓存可能导致问题。 - **解决方案**: - 执行清理命令,重新构建项目: ```bash mvn clean install ``` --- ### 7. **验证Spring Boot配置(仅限Spring Boot项目)** - 如果使用Spring Boot,添加`@EnableDubbo`注解: ```java @SpringBootApplication @EnableDubbo public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } } ``` --- 通过以上步骤,通常可以解决Dubbo命名空间处理器未找到的问题。如果问题仍然存在,建议检查日志中更详细的类加载信息,或尝试更新Dubbo到最新版本。
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