Your help is greatly appreciated: what could lead to
NoClassDefFound Error:
org/apache/struts/legacy/GenericDataSource?

the error message is HTTP Status 500.  The root cause
is:
java.lang.NoClassDefFoundError:
org/apache/struts/legacy/GenericDataSource

Here is the log:

description: The server encountered an internal error
() that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Servlet.init() for
servlet action threw exception
        at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:962)
        at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:666)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
        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.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
        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$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386)
        at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
        at java.lang.Thread.run(Thread.java:536)


root cause 

java.lang.NoClassDefFoundError:
org/apache/struts/legacy/GenericDataSource
        at java.lang.ClassLoader.defineClass0(Native Method)
        at
java.lang.ClassLoader.defineClass(ClassLoader.java:502)
        at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
        at
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1664)
        at
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:953)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1394)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1274)
        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:934)
        at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:666)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
        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.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
        at
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
        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$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386)
        at
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
        at java.lang.Thread.run(Thread.java:536)



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