GraphicImage with StreamedContent doen't work!

[n3tmaster]

Hi guys,
I have a big problem with GraphicImage and StreamedContents using PrimeFaces 5.1

My situation is the following:

I have a PNG raster stored in a PostgreSQL DB (version 9.4 with PostGIS 2.1 and GDAL 1.11); I create a bean method to perform a query to DB in order to get the stored image and show it on my UI page.

My bean:

Code: Select all

@ManagedBean(name="mapUrbanBean")
@SessionScoped

public class MapBean implements Serializable{
private StreamedContent image1;

//....

//bean getter
public StreamedContent getImage1() {
        FacesContext context = FacesContext.getCurrentInstance();
        
        if(context.getCurrentPhaseId() == PhaseId.RENDER_RESPONSE){
            return new DefaultStreamedContent();
        }else{
            return image1;
        }
        
       
    }

}

//...


/**
* Note: dsm is an istance of my Class for DB connection management
*/
public void queryImage(){
//...
         InputStream imgReaded;


         dsm.setPreparedStatementRef("Select ST_AsPNG(ST_ColorMap(rast,1,colormap)) from  my_raster_table order by data desc");  //this query uses PostGIS functions in order to extract the PNG image
        
        dsm.runPreparedQuery();
         
        if(dsm.next()){
         
            imgReaded = dsm.getBStream(1); //getBStream retrieves the    BinaryStream of the image

             image1 = new DefaultStreamedContent(imgReaded , "image/png"); //save the image in the StreamedContent
        }

}


//....

and this is my JSF code

Code: Select all

 <p:graphicImage id="rasterout" value="#{mapUrbanBean.image1}" binding="#{rasterout}" cache="false"/>
 <p:commandButton   title="showImg" 
                                                        update=":#{rasterout.clientId} "
                                                        action="#{mapUrbanBean.queryImage}" 
                                                        
                                                        />

When the page being loaded , I got a "500 Server Error".
In the tomcat log file I was able to see that getImage1 getter function is called during the page load phase...
Moreover the method that performs the Postgresql query works fine.


My project specs: PrimeFaces 5.1, Tomcat 6, JDK 1.7, JDBC 41 for Postgresql 9.4, Mojarra 2.2.2 (I'm using NetBeans with Maven)

Any idea? Thank you in advance and sorry for my bad english