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https://issues.apache.org/jira/browse/CXF-5421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832030#comment-13832030
 ] 

Christophe Levesque commented on CXF-5421:
------------------------------------------

Workaround is to manually exclude the dependency:

                <dependency>
                        <groupId>org.apache.cxf</groupId>
                        <artifactId>cxf-rt-rs-security-oauth2</artifactId>
                        <version>${org.apache.cxf-version}</version>
                        <exclusions>
                                <exclusion>
                                        
<artifactId>geronimo-servlet_3.0_spec</artifactId>
                                        
<groupId>org.apache.geronimo.specs</groupId>
                                </exclusion>
                        </exclusions>
                </dependency>


> Servlet dependency in OAuth2 pom.xml should be with scope "provided"
> --------------------------------------------------------------------
>
>                 Key: CXF-5421
>                 URL: https://issues.apache.org/jira/browse/CXF-5421
>             Project: CXF
>          Issue Type: Bug
>            Reporter: Christophe Levesque
>
> From cxf-rt-rs-security-oauth2's pom.xml:
>        <dependency>
>             <groupId>${cxf.servlet-api.group}</groupId>
>             <artifactId>${cxf.servlet-api.artifact}</artifactId>
>             <version>${cxf.servlet-api.version}</version>
>         </dependency>
> This should have a <scope>provided</scope> otherwise the servlet JAR will be 
> pulled in as a transitive dependency. It may conflict with the container's 
> own servlet and throw exceptions like:
> Caused by: java.lang.ClassCastException: 
> org.springframework.web.SpringServletContainerInitializer cannot be cast to 
> javax.servlet.ServletContainerInitializer
>       at 
> org.apache.catalina.startup.ContextConfig.getServletContainerInitializer(ContextConfig.java:1670)
>       at 
> org.apache.catalina.startup.ContextConfig.getServletContainerInitializers(ContextConfig.java:1652)
>       at 
> org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1562)
>       at 
> org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1270)
>       at 
> org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
>       at 
> org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:376)
>       at 
> org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
>       at 
> org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
>       at 
> org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5322)
>       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
>       ... 6 more



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