首页 > 代码库 > Unable to locate Spring NamespaceHandler for XML schema namespace

Unable to locate Spring NamespaceHandler for XML schema namespace

java服务中整合了spring,在Eclipse里本地启动时没问题,但是部署到局域网linux服务器上时解析spring applicationContext.xml报错,具体报错信息如下:

Console代码  收藏代码
  1. org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.springframework.org/schema/context]  

 

关于这个问题,纠结了我大半天时间,网上的资料也是众说纷纭,有的说是spring版本不统一、有些说是缺少对应的spring依赖的。不过这些原因都被我逐一排除了。

 

功夫不负有心人,在仔细地对比和排查原因之后,发现了问题的所在,在我的jar包下的META-INF目录下,有两个跟spring相关的文件:spring.handlers、spring.schemas,打开这两个文件一看,里面都只包含了spring-tx的配置

spring.handlers:

Txt代码  收藏代码
  1. http\://www.springframework.org/schema/tx=org.springframework.transaction.config.TxNamespaceHandler  

spring.schemas:

Txt代码  收藏代码
  1. http\://www.springframework.org/schema/tx/spring-tx-2.0.xsd=org/springframework/transaction/config/spring-tx-2.0.xsd  
  2. http\://www.springframework.org/schema/tx/spring-tx-2.5.xsd=org/springframework/transaction/config/spring-tx-2.5.xsd  
  3. http\://www.springframework.org/schema/tx/spring-tx-3.0.xsd=org/springframework/transaction/config/spring-tx-3.0.xsd  
  4. http\://www.springframework.org/schema/tx/spring-tx-3.1.xsd=org/springframework/transaction/config/spring-tx-3.1.xsd  
  5. http\://www.springframework.org/schema/tx/spring-tx.xsd=org/springframework/transaction/config/spring-tx-3.1.xsd  

里面并没有spring-context的schema和handler配置,所以会报错。

 

那么问题的根源是什么呢,在stackoverflow上找到了答案:http://stackoverflow.com/questions/1937767/spring-3-0-unable-to-locate-spring-namespacehandler-for-xml-schema-namespace

 

因为我使用了maven-shade-plugin这个maven打包插件,主要原因是插件配置不当导致,我原来的配置如下:

Xml代码  收藏代码
  1. <plugin>  
  2.     <groupId>org.apache.maven.plugins</groupId>  
  3.     <artifactId>maven-shade-plugin</artifactId>  
  4.     <version> 1.7.1</version>  
  5.     <executions>  
  6.         <execution>  
  7.             <phase>package</phase>  
  8.             <goals>  
  9.                 <goal>shade</goal>  
  10.             </goals>  
  11.             <configuration>  
  12.                 <transformers>  
  13.                     <transformer  
  14.                         implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">  
  15.                         <mainClass>com.chenzhou.test.Main</mainClass>  
  16.                     </transformer>  
  17.                 </transformers>  
  18.             </configuration>  
  19.         </execution>  
  20.     </executions>  
  21. </plugin>  

由于没有配置META-INF/spring.handlers和META-INF/spring.schemas所以如果工程中依赖了Spring的多个依赖,在打包时后面的会把前面的覆盖,使得这两个文件中永远只保存最后一个spring依赖的schema和handler。

解决方法就是在里面加上META-INF/spring.handlers和META-INF/spring.schemas的配置:

Xml代码  收藏代码
  1. <plugin>  
  2.     <groupId>org.apache.maven.plugins</groupId>  
  3.     <artifactId>maven-shade-plugin</artifactId>  
  4.     <version> 1.7.1</version>  
  5.     <executions>  
  6.         <execution>  
  7.             <phase>package</phase>  
  8.             <goals>  
  9.                 <goal>shade</goal>  
  10.             </goals>  
  11.             <configuration>  
  12.                 <transformers>  
  13.                     <transformer  
  14.                         implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">  
  15.                         <resource>META-INF/spring.handlers</resource>  
  16.                     </transformer>  
  17.                     <transformer  
  18.                         implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">  
  19.                         <resource>META-INF/spring.schemas</resource>  
  20.                     </transformer>  
  21.                     <transformer  
  22.                         implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">  
  23.                         <mainClass>com.chenzhou.test.Main</mainClass>  
  24.                     </transformer>  
  25.                 </transformers>  
  26.             </configuration>  
  27.         </execution>  
  28.     </executions>  
  29. </plugin>  

和第一段配置对比,主要增加了:

Xml代码  收藏代码
  1. <transformer  
  2.     implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">  
  3.     <resource>META-INF/spring.handlers</resource>  
  4. </transformer>  
  5. <transformer  
  6.     implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">  
  7.     <resource>META-INF/spring.schemas</resource>  
  8. </transformer>  

这段配置意思是把spring.handlers和spring.schemas文件以append方式加入到构建的jar包中。

 

修改完后,再次打包,此时就会把工程依赖的所有的spring依赖的schema和handler都加载到spring.handlers和spring.schemas里面。加载applicationContext.xml时就不会报错了。

Unable to locate Spring NamespaceHandler for XML schema namespace