I'm trying to run a JSP application called B*Gallery
(http://www.b-gallery.biz) on JRun 3.1 and am getting the following
error:

500 Internal Server Error

/gallery/index.jsp:
Exception thrown processing JSP page.
java.lang.NoClassDefFoundError: javax/servlet/ServletContextListener
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:250)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at com.bwy.bgallery.jsp.AlbumManager.<init>(AlbumManager.java:30)
at com.bwy.bgallery.jsp.AlbumManager.<clinit>(AlbumManager.java:22)
at com.bwy.bgallery.jsp.GalleryHomeBean.<init>(GalleryHomeBean.java:18)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:306)
at java.lang.Class.newInstance(Class.java:259)
at allaire.jrun.jsp.JRunJSPStaticHelpers.createBean(JRunJSPStaticHelpers.java:246)
at allaire.jrun.jsp.JRunJSPStaticHelpers.getAndSetBean(JRunJSPStaticHelpers.java:196)
at jrun__index2ejspa._jspService(jrun__index2ejspa.java:43)
at allaire.jrun.jsp.HttpJSPServlet.service(HttpJSPServlet.java:39)
at allaire.jrun.jsp.JSPServlet.service(JSPServlet.java:228)
at allaire.jrun.jsp.JSPServlet.service(JSPServlet.java:196)
at allaire.jrun.servlet.JRunSE.service(JRunSE.java:1417)
at allaire.jrun.session.JRunSessionService.service(JRunSessionService.java:1088)
at allaire.jrun.servlet.JRunSE.runServlet(JRunSE.java:1271)
at allaire.jrun.servlet.JRunRequestDispatcher.forward(JRunRequestDispatcher.java:89)
at allaire.jrun.servlet.JRunSE.service(JRunSE.java:1557)
at allaire.jrun.servlet.JRunSE.service(JRunSE.java:1547)
at allaire.jrun.servlet.JvmContext.dispatch(JvmContext.java:364)
at allaire.jrun.http.WebEndpoint.run(WebEndpoint.java:115)
at allaire.jrun.ThreadPool.run(ThreadPool.java:272)
at allaire.jrun.WorkerThread.run(WorkerThread.java:75)

I'm no java expert, but it seems like I'm missing a java class
(ServletContextListener)? I am
successfully running other jsp applications, however I don't think any
are taking advantage of the ServletContextListener interface that the
above error message is complaining about.  If I am missing this class,
how can I go about getting this class? and how can I tell what other
classes, if any, are missing?

I'm sure the author of B*Gallery would be as grateful as I would if
someone can point me in the right direction--I'm on the edge ready to
buy his software as soon as I can get it running!