我将一个JavaFX项目从NetBeans导入Eclipse。奇怪的是，我无法执行在NetBeans中运行良好的代码。我用SceneBuilder设置了一个小gui。我只想展示一点.fxml - 此时根本没有功能代码。我的主要课程如下：
public class Main extends Application {
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle(Strings.appName);
stage.getIcons().add(new Image("sql.png"));
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
但是当我尝试执行代码时，eclipse编译器返回：
Application start方法中的异常 java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来源）at java.lang.reflect.Method.invoke（未知来源）at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs（未知 来源）at com.sun.javafx.application.LauncherImpl.launchApplication（未知 来源）at sun.reflect.NativeMethodAccessorImpl.invoke0（Native 方法）at sun.reflect.NativeMethodAccessorImpl.invoke（未知 来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知 来自）java.lang.reflect.Method.invoke（未知来源）at sun.launcher.LauncherHelper $ FXHelper.main（Unknown Source）引起： java.lang.RuntimeException：Application start方法中的异常 com.sun.javafx.application.LauncherImpl.launchApplication1（未知 来源）at com.sun.javafx.application.LauncherImpl.lambda $ launchApplication $ 156（未知 java）在java.lang.Thread.run（未知来源）引起： java.lang.NullPointerException：位置是必需的。在 javafx.fxml.FXMLLoader.loadImpl（未知来源）at javafx.fxml.FXMLLoader.loadImpl（未知来源）at javafx.fxml.FXMLLoader.loadImpl（未知来源）at javafx.fxml.FXMLLoader.loadImpl（未知来源）at javafx.fxml.FXMLLoader.loadImpl（未知来源）at javafx.fxml.FXMLLoader.load（未知来源）at core.Main.start（Main.java:27）at com.sun.javafx.application.LauncherImpl.lambda $ launchApplication1 $ 163（未知 来源）at com.sun.javafx.application.PlatformImpl.lambda $ runAndWait $ 176（未知 来源）at com.sun.javafx.application.PlatformImpl.lambda为$ null $ 174（未知 来自java.security.AccessController.doPrivileged（Native Method） 在 com.sun.javafx.application.PlatformImpl.lambda $ runLater $ 175（未知 来源）com.sun.glass.ui.InvokeLaterDispatcher $ Future.run（未知 来源）com.sun.glass.ui.win.WinApplication._runLoop（Native 方法）at com.sun.glass.ui.win.WinApplication.lambda $ null $ 149（未知来源） ... 1个异常运行应用程序核心。主要
这是我的项目结构：
SQL │ .classpath │ .project │ ├───.settings │ org.eclipse.jdt.core.prefs │ ├───bin │ ├───gui │ │ FXMLDocument.fxml │ │ FXMLDocumentController.class │ │ Main.class │ │ sql.png │ │ │ ├───print │ │ Allgemein.class │ │ Mahnung.class │ │ PDF.class │ │ Rechnung.class │ │ │ └───various │ Strings.class │ └───src └───gui FXMLDocument.fxml FXMLDocumentController.java Main.java
我在这里做错了什么？或者是eclipse在这里期待什么，NetBeans不是吗？！？
答案 0 :(得分：0)
就像@James_D建议的那样，我能够使用
来追踪问题import UIKit
import GoogleMaps
class ViewController: UIViewController, NSXMLParserDelegate {
var parser = NSXMLParser()
var timer = NSTimer()
// viewDidLoad()
override func viewDidLoad() {
super.viewDidLoad()
// runs viewDidLoad() every 10 seconds
timer = NSTimer.scheduledTimerWithTimeInterval(10.0, target: self, selector: "viewDidLoad", userInfo: nil, repeats: true)
// XML file
parser = NSXMLParser(contentsOfURL:(NSURL(string:"http://link.to.xml.file.xml"))!)!
let coord = Coord2()
parser.delegate = coord
parser.parse()
print("coord has a count attribute of \(coord.count)")
print("coord has \(coord.markers.count) markers")
// displays the map adjusted to UC Santa Cruz
let camera = GMSCameraPosition.cameraWithLatitude(37.0000,
longitude: -122.0600, zoom: 14)
let mapView = GMSMapView.mapWithFrame(CGRectZero, camera: camera)
mapView.mapType = kGMSTypeNormal
mapView.myLocationEnabled = true
self.view = mapView
// loops through all the lats and lngs of the buses and produces a marker
// for them on our Google Maps app
for marker in coord.markers {
print("marker id=\(marker.id), lat=\(marker.lati), lng=\(marker.lngi), route=\(marker.route)")
// displays the buses
let buses = GMSMarker()
buses.position = CLLocationCoordinate2DMake(marker.lati, marker.lngi)
buses.title = marker.route
if buses.title == "UPPER CAMPUS" {
buses.icon = UIImage(named: "uppercampus")
} else if buses.title == "LOOP" {
buses.icon = UIImage(named: "innerloop")
}
buses.snippet = marker.id
buses.map = mapView
}
}
// didReceiveMemoryWarning()
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
// ParseBase class
// simple base class that is used to consume foundCharacters
// via the parser
class ParserBase : NSObject, NSXMLParserDelegate {
var currentElement:String = ""
var foundCharacters = ""
weak var parent:ParserBase? = nil
func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
currentElement = elementName
}
func parser(parser: NSXMLParser, foundCharacters string: String) {
self.foundCharacters = string
}
}
// Coord2 class
// represents a coord2 tag
// it has a count attribute
// and a collection of markers
class Coord2 : ParserBase {
var count = 0
var markers = [Marker]()
// didStartElement()
override func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [String : String]) {
print("processing <\(elementName)> tag from Coord")
if elementName == "coord2" {
// if we are processing a coord2 tag, we are at the root
// of XML file, extract the count value and set it
print(attributeDict["count"])
if let c = Int(attributeDict["count"]!) {
self.count = c
}
}
// if we found a marker tag, delegate further responsibility
// to parsing to a new instance of Marker
if elementName == "marker" {
let marker = Marker()
self.markers.append(marker)
// push responsibility
parser.delegate = marker
// let marker know who we are
// so that once marker is done XML processing
// it can return parsing responsibility back
marker.parent = self
}
}
}
// Marker class
class Marker : ParserBase {
var id = ""
var lat = ""
var lng = ""
var route = ""
var lati = 0.0
var lngi = 0.0
// didEndElement()
func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
print("processing <\(elementName)> tag from Marker")
// if we finished an item tag, the ParserBase parent
// would have accumulated the found characters
// so just assign that to our item variable
if elementName == "id" {
self.id = foundCharacters
}
// convert the lat to a Double
else if elementName == "lat" {
self.lat = foundCharacters
// cast self.lat as Double
if let doubleFromlat = Double(self.lat) {
self.lati = doubleFromlat
} else { print("foundCharacters for lat does not hold double") }
}
// convert the lng to a Double
else if elementName == "lng" {
self.lng = foundCharacters
if let doubleFromlng = Double(self.lng) {
self.lngi = doubleFromlng
} else { print("foundCharacters for lng does not hold double") }
}
else if elementName == "route" {
self.route = foundCharacters
}
// if we reached the </marker> tag, we do not
// have anything further to do, so delegate
// parsing responsibility to parent
else if elementName == "marker" {
parser.delegate = self.parent
}
// reset found characters
foundCharacters = ""
}
}
和
System.out.println(getClass().getResource("Main.class"));
当我从运行NetBeans的ubuntu笔记本电脑复制到运行10和Eclipse的主Windows机器时，我的类路径必须以某种方式损坏。我修好了，现在一切正常。