【发布时间】：2018-02-07 17:22:52
【问题描述】：
我正在尝试使用 JavaFx 实现 mvvm 模式。为此，我使用了 mvvmfx 框架。
要使用模型中的数据，我尝试使用 NotificationCenter。在我的视图模型中插入 initialize-method 以订阅消息时，我得到一个异常：NoClassDefFoundError: javax/annotation/PostConstruct。
如果有人能告诉我我做错了什么，我将不胜感激。
这是我的视图模型：
@Singleton
public class BasementVM implements ViewModel {
@Inject
private NotificationCenter notificationCenter;
private NotificationObserver observer; // 1
private StringProperty basementViewKesselTempLbl = new SimpleStringProperty("27");
public StringProperty KesselTemperatur(){
return basementViewKesselTempLbl;
}
public String getKesselTemperatur(){
return basementViewKesselTempLbl.get();
}
public void setKesselTemperatur(String message){
basementViewKesselTempLbl.set(message);
}
public void initialize() {
// 2
observer = (key, payload) -> {
setKesselTemperatur(payload.toString());
};
notificationCenter.subscribe("test", new WeakNotificationObserver(observer)); // 3
}
}
这是我启动应用程序的地方
public class Main extends MvvmfxGuiceApplication{
private static Logger logger = Logger.getLogger(Main.class);
@Override
public void startMvvmfx(Stage stage) throws Exception {
stage.setTitle("Hello World Application");
ViewTuple<DashBoardView, DashBoardVM> viewTuple = FluentViewLoader.fxmlView(DashBoardView.class).load();
Parent root = viewTuple.getView();
stage.setScene(new Scene(root));
stage.show();
}
public static void main(String[] args) {
Application.launch(args);
}
}
这里是 Stacktrace：
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:945)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.NoClassDefFoundError: javax/annotation/PostConstruct
at de.saxsys.mvvmfx.internal.viewloader.ViewLoaderReflectionUtils.lambda$initializeViewModel$9(ViewLoaderReflectionUtils.java:397)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1380)
at de.saxsys.mvvmfx.internal.viewloader.ViewLoaderReflectionUtils.initializeViewModel(ViewLoaderReflectionUtils.java:395)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader.lambda$handleInjection$0(FxmlViewLoader.java:324)
at de.saxsys.mvvmfx.internal.viewloader.ViewLoaderReflectionUtils.lambda$createAndInjectViewModel$4(ViewLoaderReflectionUtils.java:272)
at de.saxsys.mvvmfx.internal.viewloader.ReflectionUtils.lambda$accessMember$3(ReflectionUtils.java:165)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at de.saxsys.mvvmfx.internal.viewloader.ReflectionUtils.accessMember(ReflectionUtils.java:161)
at de.saxsys.mvvmfx.internal.viewloader.ViewLoaderReflectionUtils.createAndInjectViewModel(ViewLoaderReflectionUtils.java:264)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader.handleInjection(FxmlViewLoader.java:329)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader.access$000(FxmlViewLoader.java:48)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader$DefaultControllerFactory.call(FxmlViewLoader.java:311)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader$DefaultControllerFactory.call(FxmlViewLoader.java:286)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:938)
at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:980)
at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:227)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:752)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.access$2700(FXMLLoader.java:105)
at javafx.fxml/javafx.fxml.FXMLLoader$IncludeElement.constructValue(FXMLLoader.java:1154)
at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)
at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader.loadFxmlViewTuple(FxmlViewLoader.java:171)
at de.saxsys.mvvmfx.internal.viewloader.FxmlViewLoader.loadFxmlViewTuple(FxmlViewLoader.java:82)
Disconnected from the target VM, address: '127.0.0.1:59447', transport: 'socket'
at de.saxsys.mvvmfx.FluentViewLoader$FxmlViewStep.load(FluentViewLoader.java:333)
at de.piepnitz.MaltPie.Main.startMvvmfx(Main.java:35)
at de.saxsys.mvvmfx.guice.MvvmfxGuiceApplication.start(MvvmfxGuiceApplication.java:91)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:175)
... 1 more
Caused by: java.lang.ClassNotFoundException: javax.annotation.PostConstruct
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
... 41 more
提前致谢， 皮耶特
【问题讨论】：
-
你能谈谈你的环境吗？哪个操作系统和哪个 JVM？此错误告诉您
javax.annotation.PostConstruct类不可用。但是，这个类是默认 JDK (docs.oracle.com/javase/8/docs/api/javax/annotation/…) 的一部分，所以它似乎是您的 JDK 的问题？ -
你好@ManuelMauky，是的，我认为这可能是 jdk 的问题，所以我从 9.0.1 更新到了 9.0.4。不幸的是，这并没有解决问题。 "C:\Program Files\Java\jdk-9.0.4\bin\java" 我在 Windows 机器上使用 Intellij，用 maven 构建项目。
-
在 Ubuntu 18.04 上的 openjdk 10.0.1 中出现同样的错误
标签： java mvvm java-9 postconstruct mvvmfx