How to set development mode without error?

Please tell me why or how to set success:

When I do not set development mode, console is ok!

But when I set “-DdevelopmentMode=true”, I can’t enter to console

with error info is:

HTTP ERROR: 500

Unable to compile class for JSP

RequestURI=/

Caused by:

org.apache.jasper.JasperException: Unable to compile class for JSP
     at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:96)
     at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:342)
     at org.apache.jasper.compiler.AntCompiler.generateClass(AntCompiler.java:251)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:297)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
     at org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
     at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:303)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     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:726)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:285)
     at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
     at org.mortbay.jetty.servlet.DefaultServlet.doGet(DefaultServlet.java:463)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
     at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
     at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
     at org.mortbay.jetty.servlet.ServletHandler$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:726)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
     at org.mortbay.jetty.Server.handle(Server.java:324)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
     at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
     at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK
     at org.apache.tools.ant.taskdefs.compilers.CompilerAdapterFactory.getCompiler(CompilerAdapterFactory.java:105)
     at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:924)
     at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757)
     at org.apache.jasper.compiler.AntCompiler.generateClass(AntCompiler.java:219)
     ... 40 more

Hi Jet, I figured this is solved for you, but wanted to close the loop on this one. I came across this and by adding the %java_home%\lib\tools.jar to my classpath I was able to setup my admin console dev environment. The path I gave was my windows path, update as appropriate for your setup

Phil