I would really appreciate some answers on this one...
I have a page that allows the user to download a file that is stored in the
database as a BLOB. The following exception is thrown when the download link is
clicked. I can trace through my method to the point where the reponse is
returning through the Seam filters, so I know that the method is returning the
bytes associated with the file.
java.lang.IllegalStateException: Servlet response already use stream, Writer
not possible
| at
org.ajax4jsf.webapp.FilterServletResponseWrapper.getWriter(FilterServletResponseWrapper.java:226)
| at
javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
| at
javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
| at
javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112)
| at
com.sun.facelets.FaceletViewHandler.createResponseWriter(FaceletViewHandler.java:414)
| at
com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:571)
| at
org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
| at
org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:216)
| at
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
| at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
| at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
| ...
My page looks like this:
<h:panelGrid id="document" columns="2">
| <h:outputLabel value="Location"/>
| <h:outputText value="#{documentLocation.location}"/>
|
| <h:outputLabel value="Upload Date"/>
| <h:outputText
value="#{documentLocation.uploadDate}"/>
|
| <h:outputLabel value="Content Type"/>
| <h:outputText
value="#{documentLocation.contentType}"/>
|
| <h:outputLabel value="Description"/>
| <h:outputText value="#{documentLocation.notes}"/>
|
| <h:panelGroup>
| <s:link id="downloadDocument" value="Download"
| action="#{documentManager.onDownload}"
| view="/download.xhtml">
| <f:param name="docId"
value="#{documentLocation.id}"/>
| </s:link>
| </h:panelGroup>
| </h:panelGrid>
|
|
The onDownload method looks like this:
| public String onDownload()
| {
| System.out.println( "DocumentManagerAction.onDownload() called" );
| System.out.println( "Value of doc id is " + docId );
|
| HttpServletResponse response = ( HttpServletResponse )
facesContext.getExternalContext().getResponse();
|
| response.setContentType( "application/pdf" );
| try
| {
| byte[] docData = getDocumentData();
|
| if ( docData != null && docData.length > 0 )
| {
| response.setContentLength( docData.length );
| os.write( docData );
| os.flush();
| os.close();
|
|
| System.out.println( "\nSuccess\n" );
| }
| facesContext.responseComplete();
|
| }
| catch ( Exception e )
| {
| System.out.println( "\nFailure : " + e.toString() + "\n" );
| return null;
| }
|
| return "done";
| }
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