javafx.fxml.LoadException: Controller value already specified [duplicate] - javafx

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JavaFX Error: Controller value already specified
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javafx exception : Controller value already specified
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Closed 4 years ago.
I have looked at the posts for this and Im still stuck - any help please?
I am trying to display a line chart in scenebuilder (IntelliJ) - but keep getting different errors about constructors.The last error was
'JavaFX Error : Controller already specified'but have removed it previously and still get an error.
and have tried different arguments in Main for FXMLLoader with the loader.setController(...) line, and no luck. I keep reading about sometimes factory controllers are needed if arguments are being passed to the constructor - so think it might be this, but dont know how to write one.Any suggestions please? or good links for me to read up?
My last attempt for FXMLLoaderCode from Main below...
FXMLLoader loader = new FXMLLoader(getClass().getResource("/sample/view/graph.fxml"));
loader.setController(new Controller(sortList));
Parent root = loader.load();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
If anybody has any useful links so I could read up about factory controllers that would be really good. My full code is below.
My programs are
Main(Main.java)
entry point for program and uses FXML loader
Model(SortList.java)
places numbers in x and y(abscissa ordinate) groups
Controller(Controller.java)
add x,y to graph
View(graph.fxml)
graph xml displays x-y line chart
ReadInData(ReadInData.java)
Reads in and parses numbers
Errors
javafx.fxml.LoadException: Controller value already specified.
/C:/Users/user/IdeaProjects/myjavafx/out/production/myjavafx/sample/view/graph.fxml:18
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:103)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:914)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at sample.Main.start(Main.java:32)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
at java.lang.Thread.run(Thread.java:748)
Model (SortList.java)
public class SortList {
private final double abscissa;
private final double ordinate;
public SortList(double abscissa, double ordinate) {
this.abscissa = abscissa;
this.ordinate = ordinate;
}
public double getabscissa() {
return abscissa;
}
public double getordinate() {
return ordinate;
}
}
View (graph.java)
fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.chart.CategoryAxis?>
<?import javafx.scene.chart.NumberAxis?>
<?import javafx.scene.chart.ScatterChart?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.control.Label?>
<AnchorPane id="AnchorPane"
maxHeight="-Infinity"
maxWidth="-Infinity"
minHeight="-Infinity"
minWidth="-Infinity"
prefHeight="400.0"
prefWidth="600.0"
xmlns="http://javafx.com/javafx/8.0.121"
xmlns:fx="http://javafx.com/fxml/1"
fx:controller = "sample.controller.Controller">
<children>
<ScatterChart layoutX="76.0" layoutY="33.0" prefHeight="335.0" prefWidth="449.0" title="Test Graph">
<xAxis>
<CategoryAxis label="X axis" pickOnBounds="false" side="BOTTOM" />
</xAxis>
<yAxis>
<NumberAxis label="Y axis" side="LEFT" upperBound="1000.0" />
</yAxis>
</ScatterChart>
</children>
</AnchorPane>
Controller (Controller.java)
package sample.controller;
import javafx.fxml.Initializable;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.XYChart;
import sample.model.SortList;
import java.net.URL;
import java.util.ArrayList;
import java.util.ResourceBundle;
public class Controller implements Initializable {
public LineChart<Double, Double> lineChart;
private final ArrayList<SortList> sortList;
public LineChart label1;
public Controller(ArrayList<SortList> sortList)
{
this.sortList = sortList;
}
#Override
public void initialize(URL location, ResourceBundle resources) {
XYChart.Series<Double, Double> graphLine = new XYChart.Series<Double, Double>();
for (SortList sortlist : sortList) {
graphLine.getData().add(new XYChart.Data(sortlist.getabscissa(), sortlist.getordinate()));
}
lineChart.getData().add(graphLine);
}
}
Main (Main.java)
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
import javafx.util.Callback;
import sample.IO.ReadInData;
import sample.controller.Controller;
import sample.model.SortList;
import java.net.URL;
import java.util.ArrayList;
import java.util.ResourceBundle;
public class Main extends Application {
#Override
public void start(Stage stage) {
stage.setTitle("Line Chart Sample");
final ArrayList<SortList> sortList = ReadInData.ReadData("C:\\Users\\user\\Desktop\\Java problem\\test.csv");
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource("/sample/view/graph.fxml"));
loader.setController(new Controller(sortList));
Parent root = loader.load();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
loader.setControllerFactory(new Callback<Class<?>, Object>(){
#Override
public Object call(Class<?> param) {
return null;
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
public class SortList {
private final double abscissa;
private final double ordinate;
public SortList(double abscissa, double ordinate) {
this.abscissa = abscissa;
this.ordinate = ordinate;
}
public double getabscissa() {
return abscissa;
}
public double getordinate() {
return ordinate;
}
}
Input/Output Read in File (ReadInData.java)
package sample.IO;
import sample.model.SortList;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
public class ReadInData {
private static final String COMMA_DELIMITER = ",";
static public ArrayList<SortList> ReadData(String filename) {
BufferedReader br = null;
ArrayList<SortList> inputList = new ArrayList<SortList>();
try {
br = new BufferedReader(new FileReader(filename));
String line = "";
br.readLine();
while ((line = br.readLine()) != null) {
String[] inputData = line.split(COMMA_DELIMITER);
if (inputData.length > 0) {
try {
double abscissa = Double.parseDouble(inputData[0]);
double ordinate = Double.parseDouble(inputData[1]);
SortList row = new SortList(abscissa, ordinate);
inputList.add(row);
} catch (NumberFormatException ex) {
ex.printStackTrace();
}
}
}
} catch (Exception e) {
System.out.println(e.getMessage());
}
return inputList;
}
}

Answer 1

Open your FXML file with Scene Builder and check this