i simply new a Guestbook project without GWT, then new a guestbook.jsp
in the war folder. no errors at the eclipse edit area(my ide: Eclipse
3.4 (Ganymede) ), but a red "X" on war/guestbook.jsp in the package
explorer. when visit guestbook.jsp, i got the flowing:

SEVERE: Javac exception
Error running javac.exe compiler
 at
org.apache.tools.ant.taskdefs.compilers.DefaultCompilerAdapter.executeExternalCompile
(DefaultCompilerAdapter.java:473)
 at org.apache.tools.ant.taskdefs.compilers.JavacExternal.execute
(JavacExternal.java:47)
 at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:931)
 at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757)
 at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:
382)
 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$2.run
(PrivilegedJspServlet.java:59)
 at java.security.AccessController.doPrivileged(Native Method)
 at com.google.appengine.tools.development.PrivilegedJspServlet.service
(PrivilegedJspServlet.java:57)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
 at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
 at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1093)
 at
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
(TransactionCleanupFilter.java:43)
 at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
(ServletHandler.java:1084)
 at com.google.appengine.tools.development.StaticFileFilter.doFilter
(StaticFileFilter.java:124)
 at org.mortbay.jetty.servlet.ServletHandler$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:54)
 at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
 at com.google.appengine.tools.development.JettyContainerService
$ApiProxyHandler.handle(JettyContainerService.java:313)
 at org.mortbay.jetty.handler.HandlerWrapper.handle
(HandlerWrapper.java:139)
 at org.mortbay.jetty.Server.handle(Server.java:313)
 at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
506)
 at org.mortbay.jetty.HttpConnection$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)
Caused by: java.io.IOException: Cannot run program "javac.exe":
CreateProcess error=2, ?????????
 at java.lang.ProcessBuilder.start(Unknown Source)
 at java.lang.Runtime.exec(Unknown Source)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
can anyone give a help? thanks!

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