You're using a JRE instead of a JDK. There are a couple of posts about these:
http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=Caused+by:+java.lang.ClassNotFoundException:com.sun.tools.javac.Main+servlet&qscrl=1 On Tue, Jun 1, 2010 at 10:37 PM, shanthi ramabhadran <[email protected]>wrote: > The guestbook sample appln throws exceptions , any one can solve my > problem? > > HTTP ERROR: 500 > > Unable to compile class for JSP > > Generated servlet error: > [javac] Caused by: java.lang.ClassNotFoundException: > com.sun.tools.javac.Main > [javac] at java.net.URLClassLoader$1.run(Unknown Source) > [javac] at java.security.AccessController.doPrivileged(Native > Method) > [javac] at java.net.URLClassLoader.findClass(Unknown Source) > [javac] at java.lang.ClassLoader.loadClass(Unknown Source) > [javac] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown > Source) > [javac] at java.lang.ClassLoader.loadClass(Unknown Source) > [javac] Exception in thread "main" Could not find the main class: > com.sun.tools.javac.Main. Program will exit. > > > > RequestURI=/ > > Caused by: > > org.apache.jasper.JasperException: Unable to compile class for JSP > > Generated servlet error: > [javac] Caused by: java.lang.ClassNotFoundException: > com.sun.tools.javac.Main > [javac] at java.net.URLClassLoader$1.run(Unknown Source) > [javac] at java.security.AccessController.doPrivileged(Native > Method) > [javac] at java.net.URLClassLoader.findClass(Unknown Source) > [javac] at java.lang.ClassLoader.loadClass(Unknown Source) > [javac] at sun.misc.Launcher$AppClassLoader.loadClass(Unknown > Source) > [javac] at java.lang.ClassLoader.loadClass(Unknown Source) > [javac] Exception in thread "main" Could not find the main class: > com.sun.tools.javac.Main. Program will exit. > > > > > at > > org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java: > 84) > at > org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java: > 332) > at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java: > 412) > at org.apache.jasper.compiler.Compiler.compile(Compiler.java:472) > at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451) > at org.apache.jasper.compiler.Compiler.compile(Compiler.java:439) > at > org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java: > 511) > at > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java: > 295) > at > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: > 292) > at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236) > at > com.google.appengine.tools.development.PrivilegedJspServlet.access > $101(PrivilegedJspServlet.java:23) > at com.google.appengine.tools.development.PrivilegedJspServlet > $2.run(PrivilegedJspServlet.java:59) > at java.security.AccessController.doPrivileged(Native Method) > at > > com.google.appengine.tools.development.PrivilegedJspServlet.service(PrivilegedJspServlet.java: > 57) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) > at > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > 487) > at > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java: > 362) > at > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: > 216) > at > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java: > 181) > at > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java: > 712) > at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: > 405) > at > > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java: > 70) > at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:268) > at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126) > at > > com.google.appengine.tools.development.StaticFileUtils.serveWelcomeFileAsForward(StaticFileUtils.java: > 80) > at > > com.google.appengine.tools.development.LocalResourceFileServlet.maybeServeWelcomeFile(LocalResourceFileServlet.java: > 254) > at > > com.google.appengine.tools.development.LocalResourceFileServlet.doGet(LocalResourceFileServlet.java: > 120) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:693) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) > at > org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: > 487) > at org.mortbay.jetty.servlet.ServletHandler > $CachedChain.doFilter(ServletHandler.java:1093) > at > > com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java: > 51) > at org.mortbay.jetty.servlet.ServletHandler > $CachedChain.doFilter(ServletHandler.java:1084) > at > > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java: > 43) > at org.mortbay.jetty.servlet.ServletHandler > $CachedChain.doFilter(ServletHandler.java:1084) > at > > com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java: > 121) > at org.mortbay.jetty.servlet.ServletHandler > $CachedChain.doFilter(ServletHandler.java:1084) > at > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java: > 360) > at > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: > 216) > at > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java: > 181) > at > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java: > 712) > at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: > 405) > at > > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java: > 70) > at > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: > 139) > at com.google.appengine.tools.development.JettyContainerService > $ApiProxyHandler.handle(JettyContainerService.java:352) > at > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: > 139) > at org.mortbay.jetty.Server.handle(Server.java:313) > at > org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: > 506) > at org.mortbay.jetty.HttpConnection > $RequestHandler.headerComplete(HttpConnection.java:830) > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514) > at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381) > at > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java: > 396) > at org.mortbay.thread.BoundedThreadPool > $PoolThread.run(BoundedThreadPool.java:442) > Powered by Jetty:// > > > > > > > > > > > > > > > > > > > > -- > You received this message because you 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