So I have my controller where i have the choicebox, i try to use the addall method that takes any collection to populate the choicebox. it works when i hardcode an array as seen but when i try to use the commented out array (the one that calls the data source method), i get this error:
[echo] Executing /Users/alexanderokonkwo/Desktop/Projects/MaintenanceApp/dist/run797087945/MaintenanceApp.jar using platform /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home/bin/java
[java] Connection successful
[java] Exception in Application start method
[java] java.lang.reflect.InvocationTargetException
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[java] at java.lang.reflect.Method.invoke(Method.java:498)
[java] at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
[java] at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[java] at java.lang.reflect.Method.invoke(Method.java:498)
[java] at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
[java] Caused by: java.lang.RuntimeException: Exception in Application start method
[java] at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
[java] at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$159(LauncherImpl.java:182)
[java] at java.lang.Thread.run(Thread.java:748)
[java] Caused by: javafx.fxml.LoadException:
[java] file:/Users/alexanderokonkwo/Desktop/Projects/MaintenanceApp/dist/run797087945/MaintenanceApp.jar!/maintenanceapp/FXMLDocument.fxml:12
[java]
[java] at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
[java] at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
[java] at maintenanceapp.MaintenanceApp.start(MaintenanceApp.java:24)
[java] at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$166(LauncherImpl.java:863)
[java] at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$179(PlatformImpl.java:326)
[java] at com.sun.javafx.application.PlatformImpl.lambda$null$177(PlatformImpl.java:295)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at com.sun.javafx.application.PlatformImpl.lambda$runLater$178(PlatformImpl.java:294)
[java] at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
[java] Caused by: java.lang.NullPointerException
[java] at maintenanceapp.model.Datasource.getMaintenanceTypesAsArray(Datasource.java:57)
[java] at maintenanceapp.FXMLDocumentController.<init>(FXMLDocumentController.java:29)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
[java] at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
[java] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
[java] at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
[java] at java.lang.Class.newInstance(Class.java:442)
[java] at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)
[java] at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:927)
[java] at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971)
[java] at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220)
[java] at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744)
[java] at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707)
[java] at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
[java] ... 14 more
[java] Exception running application maintenanceapp.MaintenanceApp
this is my controller class:
public class FXMLDocumentController implements Initializable {
Datasource datasource = new Datasource();
@FXML
private ChoiceBox<String> typeChoiceBox;
private String typeArray[] = {"Oil", "Spark Plugs","Transmission Fluid"};
// private String typeArray[] = datasource.getMaintenanceTypesAsArray();
@Override
public void initialize(URL url, ResourceBundle rb) {
typeChoiceBox.getItems().addAll(typeArray);
}
}
and this is the method in my datasource class that returns an array with the information I want to display. I already printed out the array and its populating correctly. For some reason i just cant get it to show up in the choicebox. When i hardcode the array it works but when i use the other array thats commented out (the one that calls the datasource method), i get the error. Any one have a clue?
public String[] getMaintenanceTypesAsArray() {
try (Statement statement = conn.createStatement();
ResultSet results = statement.executeQuery("SELECT * FROM " + TABLE_MAINTENANCETYPE)){
List<MaintenanceType> types = new ArrayList<>();
while(results.next()){
MaintenanceType type = new MaintenanceType();
type.setType(results.getString(COLUMN_TYPE));
types.add(type);
}
String typesArray[];
typesArray = new String[types.size()];
for (int i = 0; i < types.size(); i++){
typesArray[i] = types.get(i).getType();
}
return typesArray;
} catch (SQLException e) {
System.out.println("Query failed: " + e.getMessage());
return null;
}
}
