Primefaces 6 & Content Flow Error - primefaces

Question

I get java.io.IOException: java.lang.NullPointerException: Argument Error: Parameter url is null.
xhtml file:
<p:dataTable var="vehicleTransactionList" value="#{viewCompanyManagedBean.vehicleTransactionList}">
<p:column headerText="#{messages.saptrn}">
<h:outputText value="#{vehicleTransactionList.vehicleTransactionId}" />
</p:column>
<p:column headerText="#{messages.scalepics}">
<p:contentFlow value="#{viewCompanyManagedBean.vehicleTransactionList}" var="newimage">
<p:graphicImage value="#{newimage.imageLocations}" styleClass="content" />
<div class="caption">#{newimage.imageLocations}</div>
</p:contentFlow>
</p:column>
</p:dataTable>
The error is on the 2nd column #{newimage.imageLocations}
Managed Bean:
package com.company.beans;
import com.company.entities.Company;
import com.company.entities.Scale;
import com.company.entities.ScaleMeasurement;
import com.company.entities.VehicleTransaction;
import com.company.services.db.ScaleMeasurementService;
import com.company.services.db.ScaleService;
import java.io.IOException;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.primefaces.event.SelectEvent;
import sunw.io.Serializable;
#SuppressWarnings("deprecation")
#ManagedBean
#ViewScoped
public class ViewCompanyManagedBean implements Serializable {
static Logger webRecySys = null;
static {
webRecySys = Logger.getLogger("com.company.webRecySys");
}
public ViewCompanyManagedBean() {
}
#PostConstruct
public void populateCompanyData() {
prepareData(new Date());
images = new ArrayList<String>();
for (int i = 1; i <= 7; i++) {
images.add("file_" + i + ".jpg");
}
}
#PostConstruct
public void onDateSelect(SelectEvent event) throws UnknownHostException {
SimpleDateFormat format = new SimpleDateFormat("dd/MM/yyyy");
String date = format.format(event.getObject());
try {
Date selectedDate = format.parse(date);
prepareData(selectedDate);
} catch (ParseException e) {
e.printStackTrace();
}
FacesContext facesContext = FacesContext.getCurrentInstance();
facesContext.addMessage(null,new FacesMessage(FacesMessage.SEVERITY_INFO, "Date Selected",format.format(event.getObject())));
}
private void prepareData(Date forData) {
ScaleService ss = new ScaleService();
ScaleMeasurementService sms = new ScaleMeasurementService();
Scale right = ss.find(getRightScale());
Scale left = ss.find(getLeftScale());
this.measurements = sms.getMeasurementForScale(right,forData);
this.measurements.addAll(sms.getMeasurementForScale(left,forData));
SimpleDateFormat sdf = new SimpleDateFormat("ddMMyyyy");
this.fileName = "Shredder_Measurements_"+ sdf.format(forData);
for ( ScaleMeasurement s : measurements ) {
if ( s.getScale().getScaleId().equalsIgnoreCase(rightScale) ) {
this.rightScaleMeasurementSum += s.getMeasurement();
}
if ( s.getScale().getScaleId().equalsIgnoreCase(leftScale) ) {
this.leftScaleMeasurementSum += s.getMeasurement();
}
}
vehicleTransactionList = getVehicleTransactionList( sdf.format(forData) , (HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest() );
}
private ArrayList<VehicleTransaction> getVehicleTransactionList(String fileDateFormat,HttpServletRequest request) {
ResourceBundle resourceb = ResourceBundle.getBundle("com.company.messages.image");
String imgRootPath = resourceb.getString("imagerootpath");
ArrayList<VehicleTransaction> images = new ArrayList<VehicleTransaction>();
String name = request.getLocalName();
if ( name != null ) {
if ( name.startsWith("0") ) {
name = "localhost";
}
}
else {
name = "localhost";
}
Scale scale = new ScaleService().find("01");
Company c = new ScaleService().getCompanyFromScale(scale);
String companyName = c.getCompanyName().trim().replace(" ", "_");
String URL = "http://"+name+":"+request.getLocalPort()+imgRootPath+"/"+companyName+"/"+fileDateFormat+"/";
ArrayList<String> picUrls = new ArrayList<String>();
Document doc;
try {
doc = Jsoup.connect(URL).get();
for (Element file : doc.select("a")) {
String urlPathToFile = file.attr("href");
String fileName = file.text();
if ( urlPathToFile.endsWith(".jpg") && fileName.endsWith(".jpg") ) {
String picUrl = "http://"+name+":"+request.getLocalPort()+imgRootPath+"/"+companyName+"/"+fileDateFormat+"/"+fileName;
picUrls.add(picUrl);
}
}
} catch (IOException e) {
webRecySys.logp(Level.WARNING, this.getClass().getCanonicalName() , "getAllImagesList", "Cannot get list of Images: "+e.getMessage() );
}
ArrayList<String> vehicleTransactionIdList = getVehicleTransactionIds(picUrls);
for ( String vehicleTransactionId : vehicleTransactionIdList) {
ArrayList<String> imagesForTransaction = getVehicleTransaction(vehicleTransactionId,picUrls);
VehicleTransaction s = new VehicleTransaction(imagesForTransaction, vehicleTransactionId);
images.add(s);
}
return images;
}
private ArrayList<String> getVehicleTransaction(String vehicleTransactionId,ArrayList<String> picUrls) {
ArrayList<String> imagesForTransaction = new ArrayList<String>();
for (String url : picUrls) {
if ( url.contains(vehicleTransactionId)) {
imagesForTransaction.add(url);
}
}
return imagesForTransaction;
}
private ArrayList<String> getVehicleTransactionIds(ArrayList<String> picUrls) {
ArrayList<String> vehicleTransactionIds = new ArrayList<String>();
for ( String pic : picUrls ) {
String vehicleTransactionId = pic.substring(pic.lastIndexOf("/")+1);
vehicleTransactionId = vehicleTransactionId.substring(0,vehicleTransactionId.indexOf("_"));
if ( !existsInArl(vehicleTransactionId,vehicleTransactionIds) ) {
vehicleTransactionIds.add(vehicleTransactionId);
}
}
return vehicleTransactionIds;
}
private boolean existsInArl (String s , ArrayList<String> arl) {
boolean exists = false;
for ( String c : arl ) {
if ( c.equalsIgnoreCase(s) ) {
exists = true;
}
}
return exists;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public List<ScaleMeasurement> getMeasurements() {
return measurements;
}
public void setMeasurements(List<ScaleMeasurement> measurements) {
this.measurements = measurements;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public List<String> getImages() {
return images;
}
public void setImages(List<String> images) {
this.images = images;
}
public String getRightScale() {
return rightScale;
}
public void setRightScale(String rightScale) {
this.rightScale = rightScale;
}
public String getLeftScale() {
return leftScale;
}
public void setLeftScale(String leftScale) {
this.leftScale = leftScale;
}
public int getRightScaleMeasurementSum() {
return rightScaleMeasurementSum;
}
public void setRightScaleMeasurementSum(int rightScaleMeasurementSum) {
this.rightScaleMeasurementSum = rightScaleMeasurementSum;
}
public int getLeftScaleMeasurementSum() {
return leftScaleMeasurementSum;
}
public void setLeftScaleMeasurementSum(int leftScaleMeasurementSum) {
this.leftScaleMeasurementSum = leftScaleMeasurementSum;
}
public ArrayList<VehicleTransaction> getVehicleTransactionList() {
return vehicleTransactionList;
}
public void setVehicleTransactionList(
ArrayList<VehicleTransaction> vehicleTransactionList) {
this.vehicleTransactionList = vehicleTransactionList;
}
// Used for Calendar
private Date date;
// Used for Shredder Measurements
private List<ScaleMeasurement> measurements = new ArrayList<ScaleMeasurement>();
private String fileName;
private String rightScale = "02";
private String leftScale = "03";
private int rightScaleMeasurementSum;
private int leftScaleMeasurementSum;
// Used for Pictures
private List<String> images;
private ArrayList<VehicleTransaction> vehicleTransactionList = new ArrayList<VehicleTransaction>();
private static final long serialVersionUID = 7449888248791054139L;
}
VehicleTransaction Pojo:
package com.company.entities;
import java.util.ArrayList;
public class VehicleTransaction {
public VehicleTransaction() {
}
public VehicleTransaction(ArrayList<String> imageLocations, String vehicleTransactionId) {
super();
this.imageLocations = imageLocations;
this.vehicleTransactionId = vehicleTransactionId;
}
public ArrayList<String> getImageLocations() {
return imageLocations;
}
public void setImageLocations(ArrayList<String> imageLocations) {
this.imageLocations = imageLocations;
}
public String getVehicleTransactionId() {
return vehicleTransactionId;
}
public void setVehicleTransactionId(String vehicleTransactionId) {
this.vehicleTransactionId = vehicleTransactionId;
}
private ArrayList<String> imageLocations;
private String vehicleTransactionId;
}
What's my mistake?

Answer 1

resolved - the right xhtml code is:
<p:column headerText="#{messages.scalepics}">
<p:contentFlow value="#{vehicleTransactionList.imageLocations}" var="images">
<p:graphicImage value="#{images}" styleClass="content" />
<div class="caption">#{images}</div>
</p:contentFlow>
</p:column>
Whereas the wrong code was:
<p:contentFlow value="#{viewCompanyManagedBean.vehicleTransactionList}" var="newimage">
<p:graphicImage value="#{newimage.imageLocations}" styleClass="content" />
<div class="caption">#{newimage.imageLocations}</div>