Javac compile error

Hi to all gwt developers.

I have one strange problem. Until recently, everything worked fine,
but then, when I'm in development mode, first time I start my browser,
I got java compiler error.

HTTP ERROR: 500

Compile failed; see the compiler error output for details.

RequestURI=/index.jsp
Caused by:

Compile failed; see the compiler error output for details.
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:933)
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 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:1097)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
66)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:
168)
at
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:
58)
at
com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:
118)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:
113)
at org.mortbay.jetty.servlet.ServletHandler
$CachedChain.doFilter(ServletHandler.java:1088)
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:
729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at
org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:
49)
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:513)
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)

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Can anyone help me? Some suggestion?

Thanks in advance.

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