Java Development Tools

Hi,

We're trying to display a PDF in a pop-up by calling a Servlet within a JSF page by using a task flow in JDeveloper 11g R2.

The relevant JSF snippet:

<af:inlineFrame id="if1" shortDesc="Report" source="/pdfservlet" styleClass="AFStretchWidth"></af:inlineFrame>

The /pdfservlet points to a Servlet with a doGet method as follows:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  response.reset();
  
  OutputStream out = response.getOutputStream();

  FacesContext context = this.getFacesContext(request, response);
  OracleReportBean bean =
    context.getApplication().evaluateExpressionGet(context, "#{reportBean}", OracleReportBean.class);

  bean.run(context, out);
  removeFacesContext();

  out.close();
}

The Servlet attempts to get the FacesContext, but we've encountered the following exception:

Caused By: javax.faces.FacesException: Cant instantiate class: oracle.adfinternal.view.faces.component.AdfViewRoot.

We removed the following lines from the getFacesContext() method:

UIViewRoot view = facesContext.getApplication().getViewHandler().createView(facesContext, "");
facesContext.setViewRoot(view);

This avoids the exception above, however... We're trying to get the parameters from the form that was submitted. Here is an example element from the form:

<h:inputHidden value="MyMedicationList_Report" id="system_REPORT_RESOURCE"/>

When the Servlet calls the Managed Bean to retrieve the value, it uses:

Map<String, String[]> requestParameters = getRequestParameters();
Parameters p = getParameters();

for( String key : requestParameters.keySet() ) {
  for( String value : requestParameters.get( key ) ) {
    int i = key.indexOf( ':' );

    if( i >= 0 ) {
      key = key.substring( i + 1 );
    }

    p.put( key, value );
  }
}

Where getRequestParameters() attempts to get the external context to retrieve the request parameter values map:

return getExternalContext().getRequestParameterValuesMap();

The map comes up empty.

I've tried following http://www.oracle.com/technetwork/developer-tools/adf/learnmore/oct2010-otn-harvest-183714.pdf by setting the web.xml to:

  <!-- JspFilter must be configured before adfBindings. -->
  <filter-mapping>
    <filter-name>JpsFilter</filter-name>
    <servlet-name>PDFServlet</servlet-name>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>REQUEST</dispatcher>
  </filter-mapping>
  <filter-mapping>
    <filter-name>adfBindings</filter-name>
    <servlet-name>PDFServlet</servlet-name>
    <dispatcher>FORWARD</dispatcher>
    <dispatcher>REQUEST</dispatcher>
  </filter-mapping>

And set the data bindings to:

  <pageMap>
    <page path="/pdfservlet" usageId="ca_bcpra_promis_reporting_view_PDFServletPageDef"/>
  </pageMap>
  <pageDefinitionUsages>
    <page id="ca_bcpra_promis_reporting_view_PDFServletPageDef" path="ca.bcpra.promis.reporting.view.PDFServletPageDef"/>
  </pageDefinitionUsages>

The Servlet executes, calls the instantiated managed bean, but cannot read the request parameters.

The button used to launch the task flow in a dialog is:

<af:commandButton text="Run Report" id="submitReport" useWindow="true"
                  windowEmbedStyle="inlineDocument" windowModalityType="applicationModal" windowHeight="500"
                  windowWidth="700" action="runReport"/>

By using a task flow, the user inputs are validated before the pop-up is opened. We want to keep that behaviour. The PDF opens and then returns with a NullPointerException:

http://pastebin.com/raw.php?i=PaM64jL4

The Servlet, through the managed bean, makes a request to the report server to pass parameters and generate a PDF. The PDF is streamed back to the browser via the Servlet.

What other approaches can we take to:

1. Send user and system parameters.
2. Generate a PDF on a remote server.
3. Stream the PDF back to the user in a pop-up.

Thank you.