Problems with database connecting in Struts

struts config looks like this:

...
      <data-sources>
            <data-source>
                  <set-property property="driverClass"
                                    value="com.microsoft.jdbc.sqlserver.SQLServerDriver" />
                  <set-property property="url"
                                    value="jdbc:microsoft:sqlserver://i-prime:1433;databaseName=cca" />
                  <set-property property="maxCount"
                                    value="50"/>
                  <set-property property="minCount"
                                    value="1"/>
                  <set-property property="user"
                                    value="cca"/>
                  <set-property property="password"
                                    value="cca"/>
            </data-source>
      </data-sources>
...

and I get this message :

javax.servlet.ServletException: Servlet.init() for servlet action threw exception
      at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:963)
      at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:668)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
      at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
      at java.lang.Thread.run(Thread.java:534)


root cause

java.lang.NoClassDefFoundError: org/apache/struts/legacy/GenericDataSource
      at java.lang.ClassLoader.defineClass0(Native Method)
      at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
      at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
      at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1679)
      at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:968)
      at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1409)
      at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1289)
      at org.apache.struts.util.RequestUtils.applicationClass(RequestUtils.java:207)
      at org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:231)
      at org.apache.struts.action.ActionServlet.initModuleDataSources(ActionServlet.java:1079)
      at org.apache.struts.action.ActionServlet.init(ActionServlet.java:471)
      at javax.servlet.GenericServlet.init(GenericServlet.java:256)
      at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:935)
      at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:668)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
      at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
      at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
      at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
      at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
      at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
      at java.lang.Thread.run(Thread.java:534)


Does anybody know what is the problem?