我遇到了一个我绝对无法解决的问题，因为我刚刚开始使用JAVA FX。我得到一个讨厌的javafx.fxml.LoadException :,但我完全像一个指南（http://docs.oracle.com/javafx/scenebuilder/1/get_started/jsbpub-get_started.htm），但我不能让我的主要运行。这是控制台：
ant -f P:\\FXML\\IssueTrackingLite jfxsa-run
init:
deps-jar:
Created dir: P:\FXML\IssueTrackingLite\build
Updating property file: P:\FXML\IssueTrackingLite\build\built-jar.properties
Created dir: P:\FXML\IssueTrackingLite\build\classes
Created dir: P:\FXML\IssueTrackingLite\build\empty
Created dir: P:\FXML\IssueTrackingLite\build\generated-sources\ap-source-output
Compiling 6 source files to P:\FXML\IssueTrackingLite\build\classes
warning: [options] bootstrap class path not set in conjunction with -source 1.6
1 warning
Copying 4 files to P:\FXML\IssueTrackingLite\build\classes
compile:
Detected JavaFX Ant API version 1.3
Launching <fx:jar> task from C:\Program Files\Java\jdk1.8.0\jre\..\lib\ant-javafx.jar
Warning: From JDK7u25 the Codebase manifest attribute should be used to restrict JAR repurposing.
Please set manifest.custom.codebase property to override the current default non-secure value '*'.
Launching <fx:deploy> task from C:\Program Files\Java\jdk1.8.0\jre\..\lib\ant-javafx.jar
jfx-deployment-script:
jfx-deployment:
jar:
Copying 12 files to P:\FXML\IssueTrackingLite\dist\run910302418
jfx-project-run:
Executing P:\FXML\IssueTrackingLite\dist\run910302418\IssueTrackingLite.jar using platform C:\Program Files\Java\jdk1.8.0\jre/bin/java
before ........!
IssueTrackingLiteController.initialize
août 11, 2014 12:24:01 PM issuetrackinglite.Main start
GRAVE: null
javafx.fxml.LoadException:
file:/P:/FXML/IssueTrackingLite/dist/run910302418/IssueTrackingLite.jar!/issuetrackinglite/IssueTrackingLite.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2595)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3164)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3140)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3120)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3113)
at issuetrackinglite.Main.start(Main.java:55)
at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at issuetrackinglite.IssueTrackingLiteController.configureTable(IssueTrackingLiteController.java:481)
at issuetrackinglite.IssueTrackingLiteController.initialize(IssueTrackingLiteController.java:119)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
... 19 more
BUILD STOPPED (total time: 50 minutes 46 seconds)
这是什么意思，我该如何解决？
主要班级：
package issuetrackinglite;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;
public class Main extends Application {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Application.launch(Main.class, (java.lang.String[])null);
}
@Override
public void start(Stage primaryStage) {
try {
System.out.println(" before ........!");
AnchorPane page = (AnchorPane) FXMLLoader.load(Main.class.getResource("/issuetrackinglite/IssueTrackingLite.fxml"));
System.out.println(" after .............!");
Scene scene = new Scene(page);
primaryStage.setScene(scene);
primaryStage.setTitle("Issue Tracking Lite Sample");
primaryStage.show();
} catch (Exception ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
答案 0 :(得分：0)
我的FXML文件与Main类位于同一路径。
类控制器：
package issuetrackinglite;
public class IssueTrackingLiteController implements Initializable {
@FXML
Button newIssue;
@FXML
Button deleteIssue;
@FXML
Button saveIssue;
TableView<ObservableIssue> table;
@FXML
TableColumn<ObservableIssue, String> colName;
@FXML
TableColumn<ObservableIssue, IssueStatus> colStatus;
@FXML
TableColumn<ObservableIssue, String> colSynopsis;
@FXML
ListView<String> list;
@FXML
TextField synopsis;
private String displayedBugId; // the id of the bug displayed in the details section.
private String displayedBugProject; // the name of the project of the bug displayed in the detailed section.
@FXML
Label displayedIssueLabel; // the displayedIssueLabel will contain a concatenation of the
// the project name and the bug id.
@FXML
AnchorPane details;
@FXML
TextArea descriptionValue;
ObservableList<String> projectsView = FXCollections.observableArrayList();
TrackingService model = null;
private TextField statusValue = new TextField();
final ObservableList<ObservableIssue> tableContent = FXCollections.observableArrayList();
/**
* Initializes the controller class.
*/
@Override
public void initialize(URL url, ResourceBundle rsrcs) {
assert colName != null : "fx:id=\"colName\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert colStatus != null : "fx:id=\"colStatus\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert colSynopsis != null : "fx:id=\"colSynopsis\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert deleteIssue != null : "fx:id=\"deleteIssue\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert descriptionValue != null : "fx:id=\"descriptionValue\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert details != null : "fx:id=\"details\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert displayedIssueLabel != null : "fx:id=\"displayedIssueLabel\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert newIssue != null : "fx:id=\"newIssue\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert saveIssue != null : "fx:id=\"saveIssue\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert synopsis != null : "fx:id=\"synopsis\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert table != null : "fx:id=\"table\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
assert list != null : "fx:id=\"list\" was not injected: check your FXML file 'IssueTrackingLite.fxml'.";
System.out.println(this.getClass().getSimpleName() + ".initialize");
configureButtons();
configureDetails();
configureTable();
connectToService();
if (list != null) {
list.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
list.getSelectionModel().selectedItemProperty().addListener(projectItemSelected);
displayedProjectNames.addListener(projectNamesListener);
}
}
/**
* Called when the NewIssue button is fired.
*
* @param event the action event.
*/
@FXML
public void newIssueFired(ActionEvent event) {
final String selectedProject = getSelectedProject();
if (model != null && selectedProject != null) {
ObservableIssue issue = model.createIssueFor(selectedProject);
if (table != null) {
// Select the newly created issue.
table.getSelectionModel().clearSelection();
table.getSelectionModel().select(issue);
}
}
}
/**
* Called when the DeleteIssue button is fired.
*
* @param event the action event.
*/
@FXML
public void deleteIssueFired(ActionEvent event) {
final String selectedProject = getSelectedProject();
if (model != null && selectedProject != null && table != null) {
// We create a copy of the current selection: we can't delete
// issue while looping over the live selection, since
// deleting selected issues will modify the selection.
final List<?> selectedIssue = new ArrayList<Object>(table.getSelectionModel().getSelectedItems());
for (Object o : selectedIssue) {
if (o instanceof ObservableIssue) {
model.deleteIssue(((ObservableIssue) o).getId());
}
}
table.getSelectionModel().clearSelection();
}
}
/**
* Called when the SaveIssue button is fired.
*
* @param event the action event.
*/
@FXML
public void saveIssueFired(ActionEvent event) {
final ObservableIssue ref = getSelectedIssue();
final Issue edited = new DetailsData();
SaveState saveState = computeSaveState(edited, ref);
if (saveState == SaveState.UNSAVED) {
model.saveIssue(ref.getId(), edited.getStatus(),
edited.getSynopsis(), edited.getDescription());
}
// We refresh the content of the table because synopsis and/or description
// are likely to have been modified by the user.
int selectedRowIndex = table.getSelectionModel().getSelectedIndex();
table.getItems().clear();
displayedIssues = model.getIssueIds(getSelectedProject());
for (String id : displayedIssues) {
final ObservableIssue issue = model.getIssue(id);
table.getItems().add(issue);
}
table.getSelectionModel().select(selectedRowIndex);
updateSaveIssueButtonState();
}
private void configureButtons() {
if (newIssue != null) {
newIssue.setDisable(true);
}
if (saveIssue != null) {
saveIssue.setDisable(true);
}
if (deleteIssue != null) {
deleteIssue.setDisable(true);
}
}
// An observable list of project names obtained from the model.
// This is a live list, and we will react to its changes by removing
// and adding project names to/from our list widget.
private ObservableList<String> displayedProjectNames;
// The list of Issue IDs relevant to the selected project. Can be null
// if no project is selected. This list is obtained from the model.
// This is a live list, and we will react to its changes by removing
// and adding Issue objects to/from our table widget.
private ObservableList<String> displayedIssues;
// This listener will listen to changes in the displayedProjectNames list,
// and update our list widget in consequence.
private final ListChangeListener<String> projectNamesListener = new ListChangeListener<String>() {
@Override
public void onChanged(Change<? extends String> c) {
if (projectsView == null) {
return;
}
while (c.next()) {
if (c.wasAdded() || c.wasReplaced()) {
for (String p : c.getAddedSubList()) {
projectsView.add(p);
}
}
if (c.wasRemoved() || c.wasReplaced()) {
for (String p : c.getRemoved()) {
projectsView.remove(p);
}
}
}
FXCollections.sort(projectsView);
}
};
// This listener will listen to changes in the displayedIssues list,
// and update our table widget in consequence.
private final ListChangeListener<String> projectIssuesListener = new ListChangeListener<String>() {
@Override
public void onChanged(Change<? extends String> c) {
if (table == null) {
return;
}
while (c.next()) {
if (c.wasAdded() || c.wasReplaced()) {
for (String p : c.getAddedSubList()) {
table.getItems().add(model.getIssue(p));
}
}
if (c.wasRemoved() || c.wasReplaced()) {
for (String p : c.getRemoved()) {
ObservableIssue removed = null;
// Issue already removed:
// we can't use model.getIssue(issueId) to get it.
// we need to loop over the table content instead.
// Then we need to remove it - but outside of the for loop
// to avoid ConcurrentModificationExceptions.
for (ObservableIssue t : table.getItems()) {
if (t.getId().equals(p)) {
removed = t;
break;
}
}
if (removed != null) {
table.getItems().remove(removed);
}
}
}
}
}
};
// Connect to the model, get the project's names list, and listen to
// its changes. Initializes the list widget with retrieved project names.
private void connectToService() {
if (model == null) {
model = new TrackingServiceStub();
displayedProjectNames = model.getProjectNames();
}
projectsView.clear();
List<String> sortedProjects = new ArrayList<String>(displayedProjectNames);
Collections.sort(sortedProjects);
projectsView.addAll(sortedProjects);
list.setItems(projectsView);
}
// This listener listen to changes in the table widget selection and
// update the DeleteIssue button state accordingly.
private final ListChangeListener<ObservableIssue> tableSelectionChanged =
new ListChangeListener<ObservableIssue>() {
@Override
public void onChanged(Change<? extends ObservableIssue> c) {
updateDeleteIssueButtonState();
updateBugDetails();
updateSaveIssueButtonState();
}
};
private static String nonNull(String s) {
return s == null ? "" : s;
}
private void updateBugDetails() {
final ObservableIssue selectedIssue = getSelectedIssue();
if (details != null && selectedIssue != null) {
if (displayedIssueLabel != null) {
displayedBugId = selectedIssue.getId();
displayedBugProject = selectedIssue.getProjectName();
displayedIssueLabel.setText( displayedBugId + " / " + displayedBugProject );
}
if (synopsis != null) {
synopsis.setText(nonNull(selectedIssue.getSynopsis()));
}
if (statusValue != null) {
statusValue.setText(selectedIssue.getStatus().toString());
}
if (descriptionValue != null) {
descriptionValue.selectAll();
descriptionValue.cut();
descriptionValue.setText(selectedIssue.getDescription());
}
} else {
displayedIssueLabel.setText("");
displayedBugId = null;
displayedBugProject = null;
}
if (details != null) {
details.setVisible(selectedIssue != null);
}
}
private boolean isVoid(Object o) {
if (o instanceof String) {
return isEmpty((String) o);
} else {
return o == null;
}
}
private boolean isEmpty(String s) {
return s == null || s.trim().isEmpty();
}
private boolean equal(Object o1, Object o2) {
if (isVoid(o1)) {
return isVoid(o2);
}
return o1.equals(o2);
}
private static enum SaveState {
INVALID, UNSAVED, UNCHANGED
}
private final class DetailsData implements Issue {
@Override
public String getId() {
if (displayedBugId == null || isEmpty(displayedIssueLabel.getText())) {
return null;
}
return displayedBugId;
}
@Override
public IssueStatus getStatus() {
if (statusValue == null || isEmpty(statusValue.getText())) {
return null;
}
return IssueStatus.valueOf(statusValue.getText().trim());
}
@Override
public String getProjectName() {
if (displayedBugProject == null || isEmpty(displayedIssueLabel.getText())) {
return null;
}
return displayedBugProject;
}
@Override
public String getSynopsis() {
if (synopsis == null || isEmpty(synopsis.getText())) {
return "";
}
return synopsis.getText();
}
@Override
public String getDescription() {
if (descriptionValue == null || isEmpty(descriptionValue.getText())) {
return "";
}
return descriptionValue.getText();
}
}
private SaveState computeSaveState(Issue edited, Issue issue) {
try {
// These fields are not editable - so if they differ they are invalid
// and we cannot save.
if (!equal(edited.getId(), issue.getId())) {
return SaveState.INVALID;
}
if (!equal(edited.getProjectName(), issue.getProjectName())) {
return SaveState.INVALID;
}
// If these fields differ, the issue needs saving.
if (!equal(edited.getStatus(), issue.getStatus())) {
return SaveState.UNSAVED;
}
if (!equal(edited.getSynopsis(), issue.getSynopsis())) {
return SaveState.UNSAVED;
}
if (!equal(edited.getDescription(), issue.getDescription())) {
return SaveState.UNSAVED;
}
} catch (Exception x) {
// If there's an exception, some fields are invalid.
return SaveState.INVALID;
}
// No field is invalid, no field needs saving.
return SaveState.UNCHANGED;
}
private void updateDeleteIssueButtonState() {
boolean disable = true;
if (deleteIssue != null && table != null) {
final boolean nothingSelected = table.getSelectionModel().getSelectedItems().isEmpty();
disable = nothingSelected;
}
if (deleteIssue != null) {
deleteIssue.setDisable(disable);
}
}
private void updateSaveIssueButtonState() {
boolean disable = true;
if (saveIssue != null && table != null) {
final boolean nothingSelected = table.getSelectionModel().getSelectedItems().isEmpty();
disable = nothingSelected;
}
if (disable == false) {
disable = computeSaveState(new DetailsData(), getSelectedIssue()) != SaveState.UNSAVED;
}
if (saveIssue != null) {
saveIssue.setDisable(disable);
}
}
// Configure the table widget: set up its column, and register the
// selection changed listener.
private void configureTable() {
colName.setCellValueFactory(new PropertyValueFactory<ObservableIssue, String>("id"));
colSynopsis.setCellValueFactory(new PropertyValueFactory<ObservableIssue, String>("synopsis"));
colStatus.setCellValueFactory(new PropertyValueFactory<ObservableIssue, IssueStatus>("status"));
// In order to limit the amount of setup in Getting Started we set the width
// of the 3 columns programmatically but one can do it from SceneBuilder.
colName.setPrefWidth(75);
colStatus.setPrefWidth(75);
colSynopsis.setPrefWidth(443);
colName.setMinWidth(75);
colStatus.setMinWidth(75);
colSynopsis.setMinWidth(443);
colName.setMaxWidth(750);
colStatus.setMaxWidth(750);
colSynopsis.setMaxWidth(4430);
table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
table.setItems(tableContent);
assert table.getItems() == tableContent;
final ObservableList<ObservableIssue> tableSelection = table.getSelectionModel().getSelectedItems();
tableSelection.addListener(tableSelectionChanged);
}
/**
* Return the name of the project currently selected, or null if no project
* is currently selected.
*
*/
public String getSelectedProject() {
if (model != null && list != null) {
final ObservableList<String> selectedProjectItem = list.getSelectionModel().getSelectedItems();
final String selectedProject = selectedProjectItem.get(0);
return selectedProject;
}
return null;
}
public ObservableIssue getSelectedIssue() {
if (model != null && table != null) {
List<ObservableIssue> selectedIssues = table.getSelectionModel().getSelectedItems();
if (selectedIssues.size() == 1) {
final ObservableIssue selectedIssue = selectedIssues.get(0);
return selectedIssue;
}
}
return null;
}
/**
* Listen to changes in the list selection, and updates the table widget and
* DeleteIssue and NewIssue buttons accordingly.
*/
private final ChangeListener<String> projectItemSelected = new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
projectUnselected(oldValue);
projectSelected(newValue);
}
};
// Called when a project is unselected.
private void projectUnselected(String oldProjectName) {
if (oldProjectName != null) {
displayedIssues.removeListener(projectIssuesListener);
displayedIssues = null;
table.getSelectionModel().clearSelection();
table.getItems().clear();
if (newIssue != null) {
newIssue.setDisable(true);
}
if (deleteIssue != null) {
deleteIssue.setDisable(true);
}
}
}
// Called when a project is selected.
private void projectSelected(String newProjectName) {
if (newProjectName != null) {
table.getItems().clear();
displayedIssues = model.getIssueIds(newProjectName);
for (String id : displayedIssues) {
final ObservableIssue issue = model.getIssue(id);
table.getItems().add(issue);
}
displayedIssues.addListener(projectIssuesListener);
if (newIssue != null) {
newIssue.setDisable(false);
}
updateDeleteIssueButtonState();
updateSaveIssueButtonState();
}
}
private void configureDetails() {
if (details != null) {
details.setVisible(false);
}
if (details != null) {
details.addEventFilter(EventType.ROOT, new EventHandler<Event>() {
@Override
public void handle(Event event) {
if (event.getEventType() == MouseEvent.MOUSE_RELEASED
|| event.getEventType() == KeyEvent.KEY_RELEASED) {
updateSaveIssueButtonState();
}
}
});
}
}
}