title: How do you reference attribute list from Apache Tiles template
body: <p>I am trying to define an attribute list in the base template that includes all css links and sub definitions would append additional css links as needed. I defined the list in the tiles definition configuration file and attempted to use the list in the template.jsp file, but i get the following error:</p>
  
  <blockquote>
    <p>org.apache.tiles.template.NoSuchAttributeException:
    Error importing attributes. Attribute
    'links' is null</p>
  </blockquote>
  
  <p><strong>Tiles definition file:</strong></p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="UTF-8" ?&gt;
  &lt;!DOCTYPE tiles-definitions PUBLIC 
          "-//Apache Software Foundation//DTD Tiles Configuration 2.1//EN" 
          "http://tiles.apache.org/dtds/tiles-config_2_1.dtd"&gt;       
  &lt;tiles-definitions&gt;
      &lt;definition name="master.template"
          template="/WEB-INF/tiles/templates/template.jsp"&gt;
          &lt;put-attribute name="title" value="" /&gt;
          &lt;put-attribute name="header" value="/WEB-INF/tiles/templates/header.jsp" /&gt;
          &lt;put-attribute name="menu" value="/WEB-INF/tiles/templates/menu.jsp" /&gt;
          &lt;put-attribute name="body" value="/WEB-INF/views/home.jsp" /&gt;
          &lt;put-attribute name="footer" value="/WEB-INF/tiles/templates/footer.jsp" /&gt;         
          &lt;put-list-attribute name="links" inherit="true" cascade="true"&gt;
              &lt;add-attribute type="string" value="/stles/default.css" /&gt;
              &lt;add-attribute type="string" value="/styles/another.css" /&gt;
          &lt;/put-list-attribute&gt;
      &lt;/definition&gt;
      &lt;definition name="home" extends="master.template"&gt;
          &lt;put-attribute name="title" value="Welcome Home" /&gt;
          &lt;put-attribute name="body" value="/WEB-INF/views/home.jsp" /&gt;
      &lt;/definition&gt;    
      &lt;definition name="about" extends="master.template"&gt;
          &lt;put-attribute name="title" value="About" /&gt;
          &lt;put-attribute name="body" value="/WEB-INF/views/about.jsp" /&gt;
  
      &lt;/definition&gt; 
  &lt;/tiles-definitions&gt;
  </code></pre>
  
  <p><strong>Template.jsp</strong></p>
  
  <pre><code>&lt;%@ taglib prefix="tiles" uri="http://tiles.apache.org/tags-tiles"%&gt;
  &lt;%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %&gt;
  &lt;%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %&gt;
  &lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"&gt;
  &lt;html&gt;
      &lt;head&gt;    
          &lt;title&gt;&lt;tiles:insertAttribute name="title" ignore="true" /&gt;&lt;/title&gt;         
          &lt;!-- links --&gt;      
          &lt;tiles:useAttribute name="links"/&gt;  
          &lt;c:forEach var="href" items="${items}"&gt; 
          &lt;link type="text/css" rel="stylesheet" href="${href}" /&gt;
          &lt;/c:forEach&gt;                    
      &lt;/head&gt;
      &lt;body&gt;
          &lt;div id="page"&gt;
              &lt;div id="header"&gt;&lt;tiles:insertAttribute name="header" /&gt;&lt;/div&gt;
              &lt;div id="menu"&gt;&lt;tiles:insertAttribute name="menu" /&gt;&lt;/div&gt;          
              &lt;div id="body"&gt;&lt;tiles:insertAttribute name="body" /&gt;&lt;/div&gt;
              &lt;div id="footer"&gt;&lt;tiles:insertAttribute name="footer" /&gt;&lt;/div&gt;
          &lt;/div&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p><strong>HTTP ERROR 500</strong></p>
  
  <blockquote>
    <p>Problem accessing /. Reason:</p>
  
  <pre><code>ServletException including path '/WEB-INF/tiles/templates/template.jsp'.
  </code></pre>
    
    <p>Caused by:</p>
    
    <p>org.apache.tiles.impl.CannotRenderException:
    ServletException including path
    '/WEB-INF/tiles/templates/template.jsp'.
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:692)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321)
      at
    org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:124)
      at
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
      at
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1031)
      at
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:815)
      at
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
      at
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
      at
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at
    org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
      at
    com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at
    org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at
    org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at
    org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at
    org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at
    com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
      at
    org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at
    com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
      at
    org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at
    org.mortbay.jetty.Server.handle(Server.java:326)
      at
    org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at
    org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
      at
    org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
      at
    org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
      at
    org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at
    org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
      at
    org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
    Caused by:
    org.apache.tiles.util.TilesIOException:
    ServletException including path
    '/WEB-INF/tiles/templates/template.jsp'.
      at
    org.apache.tiles.servlet.context.ServletUtil.wrapServletException(ServletUtil.java:241)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:243)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222)
      at
    org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)
      at
    org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690)
      ... 37 more Caused by:
    org.apache.tiles.template.NoSuchAttributeException:
    Error importing attributes. Attribute
    'links' is null   at
    org.apache.tiles.template.ImportAttributeModel.importSingleAttribute(ImportAttributeModel.java:133)
      at
    org.apache.tiles.template.ImportAttributeModel.getImportedAttributes(ImportAttributeModel.java:78)
      at
    org.apache.tiles.jsp.taglib.UseAttributeTag.doTag(UseAttributeTag.java:175)
      at
    org.apache.jsp.WEB_002dINF.tiles.templates.template_jsp._jspService(template_jsp.java:110)
      at
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
      at
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
      at
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
      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:717)
      at
    org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at
    org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
      at
    org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at
    org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at
    org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at
    org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at
    com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
      at
    org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
      at
    org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241)
      ... 42 more</p>
    
    <p>Caused by:</p>
    
    <p>org.apache.tiles.util.TilesIOException:
    ServletException including path
    '/WEB-INF/tiles/templates/template.jsp'.
      at
    org.apache.tiles.servlet.context.ServletUtil.wrapServletException(ServletUtil.java:241)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:243)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222)
      at
    org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)
      at
    org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321)
      at
    org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:124)
      at
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
      at
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1031)
      at
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:815)
      at
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
      at
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
      at
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at
    org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
      at
    com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at
    org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at
    org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at
    org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at
    org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at
    com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
      at
    org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at
    com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
      at
    org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at
    org.mortbay.jetty.Server.handle(Server.java:326)
      at
    org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at
    org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
      at
    org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
      at
    org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
      at
    org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at
    org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
      at
    org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
    Caused by:
    org.apache.tiles.template.NoSuchAttributeException:
    Error importing attributes. Attribute
    'links' is null   at
    org.apache.tiles.template.ImportAttributeModel.importSingleAttribute(ImportAttributeModel.java:133)
      at
    org.apache.tiles.template.ImportAttributeModel.getImportedAttributes(ImportAttributeModel.java:78)
      at
    org.apache.tiles.jsp.taglib.UseAttributeTag.doTag(UseAttributeTag.java:175)
      at
    org.apache.jsp.WEB_002dINF.tiles.templates.template_jsp._jspService(template_jsp.java:110)
      at
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
      at
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
      at
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
      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:717)
      at
    org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at
    org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
      at
    org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at
    org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at
    org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at
    org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at
    com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
      at
    org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
      at
    org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241)
      ... 42 more</p>
    
    <p>Caused by:</p>
    
    <p>org.apache.tiles.template.NoSuchAttributeException:
    Error importing attributes. Attribute
    'links' is null   at
    org.apache.tiles.template.ImportAttributeModel.importSingleAttribute(ImportAttributeModel.java:133)
      at
    org.apache.tiles.template.ImportAttributeModel.getImportedAttributes(ImportAttributeModel.java:78)
      at
    org.apache.tiles.jsp.taglib.UseAttributeTag.doTag(UseAttributeTag.java:175)
      at
    org.apache.jsp.WEB_002dINF.tiles.templates.template_jsp._jspService(template_jsp.java:110)
      at
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
      at
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
      at
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
      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:717)
      at
    org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at
    org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
      at
    org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at
    org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at
    org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at
    org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at
    com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
      at
    org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
      at
    org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241)
      at
    org.apache.tiles.servlet.context.ServletTilesRequestContext.dispatch(ServletTilesRequestContext.java:222)
      at
    org.apache.tiles.renderer.impl.TemplateAttributeRenderer.write(TemplateAttributeRenderer.java:44)
      at
    org.apache.tiles.renderer.impl.AbstractBaseAttributeRenderer.render(AbstractBaseAttributeRenderer.java:106)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:670)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:690)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:644)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:627)
      at
    org.apache.tiles.impl.BasicTilesContainer.render(BasicTilesContainer.java:321)
      at
    org.springframework.web.servlet.view.tiles2.TilesView.renderMergedOutputModel(TilesView.java:124)
      at
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
      at
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1031)
      at
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:815)
      at
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
      at
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
      at
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
      at
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at
    org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
      at
    com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:58)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
      at
    org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
      at
    org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
      at
    org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
      at
    org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
      at
    org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
      at
    org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
      at
    com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:70)
      at
    org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at
    com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:349)
      at
    org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
      at
    org.mortbay.jetty.Server.handle(Server.java:326)
      at
    org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
      at
    org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
      at
    org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
      at
    org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
      at
    org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
      at
    org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
      at
    org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)</p>
  </blockquote>