commons-attributes-compiler.jar: Required extension qdox not found
commons-attributes-compiler.jar: Required extension qdox not found
我们使用MyEclipse开发基于Spring2.0的web应用时，如果部署应用到Tomcat可能会出现commons-attributes-compiler.jar]:Requiredextensionqdoxnotfound错误。如下：
程序代码
INFO:DeployingwebapplicationarchiveGRCC.war
Sep14,200713:22:18AMorg.apache.catalina.util.ExtensionValidatorvalidateManifestResources
INFO:ExtensionValidator[/GRCC][commons-attributes-api.jar]:Requiredextension"ant"notfound.
Sep14,200713:22:18AMorg.apache.catalina.util.ExtensionValidatorvalidateManifestResources
INFO:ExtensionValidator[/GRCC][commons-attributes-compiler.jar]:Requiredextension"ant"notfound.
Sep14,200713:22:18AMorg.apache.catalina.util.ExtensionValidatorvalidateManifestResources
INFO:ExtensionValidator[/GRCC][commons-attributes-compiler.jar]:Requiredextension"javadoc"notfound.
Sep14,200713:22:18AMorg.apache.catalina.util.ExtensionValidatorvalidateManifestResources
INFO:ExtensionValidator[/GRCC]:Failuretofind3requiredextension(s).
Sep14,200713:22:18AMorg.apache.catalina.core.StandardContextstart
SEVERE:ErrorgetConfigured
Sep14,200713:22:18AMorg.apache.catalina.core.StandardContextstart
SEVERE:Context[/GRCCstartupfailedduetopreviouserrors
Sep14,200713:22:18AMorg.apache.catalina.core.StandardContextstop
INFO:Containerorg.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/GRCC]hasnotbeenstarted
原因在于commons-attributes-compiler.jar包的MANIFEST.MF文件出现问题，如果对这个包没有依赖，直接删除这个包的引用，项目就可以正常启动，如果对这个包有依赖，那么可以通过以下两种方式来解决。
1、修改MANIFEST.MF文件
原compiler.jar包中的MF文件结构
程序代码
Manifest-Version:1.0
Ant-Version:ApacheAnt1.5.3
Created-By:ApacheMaven
Built-By:hen
Package:org.apache.commons.attributes
Build-Jdk:1.4.2_05
Extension-Name:commons-attributes-api
Specification-Title:ClientAPIforJakartaCommonsAttributes.
Specification-Vendor:TheApacheSoftwareFoundation
Implementation-Title:org.apache.commons.attributes
Implementation-Vendor:TheApacheSoftwareFoundation
Implementation-Version:2.2
Extension-List:antqdox
ant-Extension-Name:ant
ant-Implementation-Version:1.5
ant-Implementation-URL:http://www.ibiblio.org/maven/ant/jars/ant-1.5.
jar
qdox-Extension-Name:qdox
qdox-Implementation-Version:1.5
qdox-Implementation-URL:http://www.ibiblio.org/maven/qdox/jars/qdox-1
.5.jar
Implementation-Vendor-Id:org.apache
X-Compile-Source-JDK:1.4
X-Compile-Target-JDK:1.4
我们可以看到URL后面的地址中含有一些不必要的字符，将MF文件修改如下
程序代码
Manifest-Version:1.0
Ant-Version:ApacheAnt1.5.3
Created-By:ApacheMaven
Built-By:hen
Package:org.apache.commons.attributes
Build-Jdk:1.4.2_05
Extension-Name:commons-attributes-api
Specification-Title:ClientAPIforJakartaCommonsAttributes.
Specification-Vendor:TheApacheSoftwareFoundation
Implementation-Title:org.apache.commons.attributes
Implementation-Vendor:TheApacheSoftwareFoundation
Implementation-Version:2.2
Extension-List:antqdox
ant-Extension-Name:ant
ant-Implementation-Version:1.5
ant-Implementation-URL:http://www.ibiblio.org/maven/ant/jars/ant-1.5.jar
qdox-Extension-Name:qdox
qdox-Implementation-Version:1.5
qdox-Implementation-URL:http://www.ibiblio.org/maven/qdox/jars/qdox-1.5.jar
Implementation-Vendor-Id:org.apache
X-Compile-Source-JDK:1.4
X-Compile-Target-JDK:1.4
这个问题就可以解决。
2、替换compiler.jar包