When I try to start up my Struts 2/Spring project, I get an exception
about a missing class, which makes me think I have a missing JAR, but I
can't find mention of anything that isn't already in my build. Could
anyone take a look, perhaps?
        

I have the following entries in my Maven POM. Am I missing anything? 
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>2.0.11</version>
        </dependency>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-sitemesh-plugin</artifactId>
            <version>2.0.11</version>
        </dependency>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-spring-plugin</artifactId>
            <version>2.0.11</version>
        </dependency>

Here is the exception stack trace:
2008-04-22 15:18:37,115 ERROR [StandardContext.java:3604] : Exception
starting filter action2
Cannot locate the chosen ObjectFactory implementation: spring - [unknown
location]
        at
org.apache.struts2.config.BeanSelectionProvider.alias(BeanSelectionProvi
der.java:224)
        at
org.apache.struts2.config.BeanSelectionProvider.alias(BeanSelectionProvi
der.java:195)
        at
org.apache.struts2.config.BeanSelectionProvider.register(BeanSelectionPr
ovider.java:153)
        at
com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultC
onfiguration.java:131)
        at
com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(Con
figurationManager.java:52)
        at
org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispa
tcher.java:395)
        at
org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)
        at
org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.jav
a:201)
        at
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFi
lterConfig.java:223)
        at
org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(Applicatio
nFilterConfig.java:304)
        at
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilte
rConfig.java:77)
        at
org.apache.catalina.core.StandardContext.filterStart(StandardContext.jav
a:3600)
        at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4193
)
        at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.ja
va:759)
        at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
        at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
        at
org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:9
04)
        at
org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java
:867)
        at
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:474)
        at
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1122)
        at
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:31
0)
        at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSu
pport.java:119)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1021)
        at
org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
        at
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1013)
        at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
        at
org.apache.catalina.core.StandardService.start(StandardService.java:450)
        at
org.apache.catalina.core.StandardServer.start(StandardServer.java:709)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:551)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
        at
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)

And the web.xml excerpt containing "action2":
    <filter>
        <filter-name>action2</filter-name>
 
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-cla
ss>
    </filter>

Thanks,
~Dan Allen


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