Link doesn't work on the same page Twice
I have implemented a module in JSF where the page displays a datatable and one the columns is a command link which when clicked opens up a dialog box to save a CLOB from the DB as a csv on the local desktop.
All this is working fine.
The problem is that once the user clicks on one link in the datatable and then the user again clicks on any other link on the page or tries to use the Logout link the page is directed to the welcome page and in the logs the following exception is there.
01/12 16:19:01 ERROR [com.common.jsf.lifecycle.FrameworkLifecycle] Exception handled for view: /restricted/reportSummary
com.common.jsf.filter.postback.PostBackValidationException: The view id: /restricted/reportSummary does not match the previous post back view id as well as it is not in the postBackValidationExcludeList.
at com.common.jsf.filter.postback.PostBackValidationPhaseListener.validatePostBackViewId(PostBackValidationPhaseListener.java:177)
at com.common.jsf.filter.postback.PostBackValidationPhaseListener.afterPhase(PostBackValidationPhaseListener.java:146)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:211)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
at com.common.jsf.lifecycle.FrameworkLifecycle.execute(FrameworkLifecycle.java:1123)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._invokeDoFilter(TrinidadFilterImpl.java:208)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:165)
at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:138)
at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:216)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:117)
at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:110)
at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
at java.lang.Thread.run(Thread.java:595)
The jsf jsp is:
<h:form>
<tr:panelHeader styleClass="titleText" text="Report Summary"/>
<tr:outputFormatted rendered="#{empty reportList}" styleClass="titleText"
value="No Match Found"/>
<h:dataTable rows="31" rowClasses="oddRow,evenRow" styleClass="font_size"
binding="#{downloadBean.summaryBindingReport}" value="#{reportList}"
var="reportSummary" rendered="#{! empty reportList}">
<h:column>
<f:facet name="header">
<h:outputText styleClass="titleText" value="Date"/>
</f:facet>
<h:outputText value="#{reportSummary.reportDate}">
<f:converter converterId="customDateConverter"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText styleClass="titleText columnSpace"
value="File Name"/>
</f:facet>
<h:commandLink value="#{reportSummary.reportName}"
action="#{downloadBean.downloadcsv}"/>
</h:column>
</h:dataTable>
</h:form>The backing bean is :
public void downloadcsv()
throws IOException, ServiceLocatorException, ReportServiceException
ReportSummary selectedReportId =
(ReportSummary) summaryBindingReport.getRowData();
ReportContent reportObj =
getReportService().getReportContent(selectedReportId.getReportId());
// Prepare.
FacesContext facesContext = FacesContext.getCurrentInstance();
ExternalContext externalContext = facesContext.getExternalContext();
HttpServletResponse response =
(HttpServletResponse) externalContext.getResponse();
BufferedInputStream input = null;
BufferedOutputStream output = null;
try
// Init servlet response.
response.reset();
response.setContentType("plain/text");
response.setHeader("Content-disposition",
"inline; filename=\"" + selectedReportId.getReportName() +
output =
new BufferedOutputStream(response.getOutputStream(), DEFAULT_BUFFER_SIZE);
char[] strReportContent = reportObj.getReportText();
Utility.logMessage(Constants.SEVERITY_INFO,
"**** Report Content ****" +
String.valueOf(strReportContent), this);
// Write the Report Content as Comma Separated values
output.write(String.valueOf(strReportContent).getBytes(), 0,
strReportContent.length);
// Finalize task.
output.flush();
finally
// Close streams.
close(output);
close(input);
// Inform JSF that it doesn't need to handle response.
// This is very important, otherwise you will get the following exception in the logs:
// java.lang.IllegalStateException: Cannot forward after response has been committed.
facesContext.responseComplete();
private static void close(Closeable resource)
if (resource != null)
try
resource.close();
catch (IOException e)
e.printStackTrace();
public void setSummaryBindingReport(HtmlDataTable summaryBinding)
this.summaryBindingReport = summaryBinding;
public HtmlDataTable getSummaryBindingReport()
return summaryBindingReport;
}
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