BUG: Warning/Error just refreshing page several times???

Hi!
I made a simple page:
<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0"
          xmlns:f="http://java.sun.com/jsf/core"
          xmlns:h="http://java.sun.com/jsf/html"
          xmlns:af="http://xmlns.oracle.com/adf/faces/rich"
          xmlns:dvt="http://xmlns.oracle.com/dss/adf/faces">
  <jsp:directive.page contentType="text/html;charset=UTF-8"/>
  <f:view>
    <af:document>
      <af:messages/>
      <af:form>
        <af:pageTemplate viewId="/oracle/templates/threeColumnTemplate.jspx">
          <f:facet name="center">
            <af:panelGroupLayout layout="vertical">
              <af:subform>
                <dvt:graph graphType="LINE_VERT_ABS"
                           dynamicResize="DYNAMIC_SIZE"
                           value="#{bindings.SampleGraphDataRow.graphModel}"/>
                <af:commandButton text="commandButton 1"/>
              </af:subform>
            </af:panelGroupLayout>
          </f:facet>
          <f:facet name="header"/>
          <f:facet name="end"/>
          <f:facet name="start"/>
          <f:facet name="branding"/>
          <f:facet name="copyright"/>
          <f:facet name="status"/>
        </af:pageTemplate>
      </af:form>
    </af:document>
  </f:view>
</jsp:root>First time I get a page without any problems (expect standard "WARNING: Header modification request was rejected. Because the setter method was called from included servlet. It is restricted by SRV.8.3 of Servlet Specification 2.4. : current-workspace-app" I'm getting with every single page).
Then I was just refreshing this page a few times (clicking a refresh button in browser, without doing anything else in page – so no PPRs, actions etc. – so no client events should be produced by my acting beside page refresh).
After several refreshes, strange WARNING (looking more like error than just warning) appeared in log window:
WARNING: empty String
java.lang.NumberFormatException: empty String
     at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:994)
     at java.lang.Double.parseDouble(Double.java:510)
     at java.text.DigitList.getDouble(DigitList.java:151)
     at java.text.DecimalFormat.parse(DecimalFormat.java:1303)
     at java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:1918)
     at java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1264)
     at java.text.DateFormat.parse(DateFormat.java:335)
     at com.evermind.server.http.EvermindHttpServletRequest.getDateHeader(EvermindHttpServletRequest.java:1581)
     at com.evermind.server.http.EvermindHttpServletRequest.getDateHeader(EvermindHttpServletRequest.java:1379)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.apache.myfaces.trinidad.webapp.ResourceServlet.service(ResourceServlet.java:162)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
     at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:118)
     at com.evermind.server.http.EvermindFilterChain.doFilter(EvermindFilterChain.java:15)
     at oracle.security.jazn.oc4j.JAZNFilter$3.run(JAZNFilter.java:434)
     at java.security.AccessController.doPrivileged(Native Method)
     at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:308)
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:452)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:583)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:334)
     at com.evermind.server.http.HttpRequestHandler.doDispatchRequest(HttpRequestHandler.java:942)
     at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:843)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:658)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:626)
     at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:417)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:189)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:163)
     at oracle.oc4j.network.ServerSocketReadHandler$ClientRunnable.run(ServerSocketReadHandler.java:275)
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
     at java.lang.Thread.run(Thread.java:619)
May 11, 2008 8:16:21 PM com.evermind.server.ServerBase log
WARNING: Application1-ViewController-webapp: Servlet error
oracle.security.jazn.JAZNRuntimeException: empty String
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:480)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:583)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:334)
     at com.evermind.server.http.HttpRequestHandler.doDispatchRequest(HttpRequestHandler.java:942)
     at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:843)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:658)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:626)
     at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:417)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:189)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:163)
     at oracle.oc4j.network.ServerSocketReadHandler$ClientRunnable.run(ServerSocketReadHandler.java:275)
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
     at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NumberFormatException: empty String
     at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:994)
Why is this happening? The page renders (apparently) normally, the graph renders as it should, but I'm not sure if the page is going to work correctly because of this warning/error.
I'm using TP4 on Vista x86, with JDK 1.6u5.
Anyone, please take a look at this. It may be a bug somewhere...
Regards,
PaKo

Pako,
the message "java.lang.NumberFormatException: empty String" points to a missing data value. I'll file a bug and ask QA to verify this.
Frank

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