JAXBException：此上下文已知 SaveButton 或其任何超级 class
JAXBException: SaveButton nor any of its super class is known to this context
我已经阅读了几个关于这个主题的帖子，但其中 none 似乎回答了我的具体问题。在包 "settings" 中，我有一个 SettingModel.java class 使用 jaxb 从 default.xml 文件加载默认设置。这完美无缺。然后，在同一个包下，在一个名为 SettingsWidgets 的子包中，我有一个 SaveButton.java class，它有一个 setOnMouseClick eventListener，触发一个方法 "saveSettings".该代码部分工作：当前文件被覆盖（尽管无效）或在所需包中创建新的（但为空）xml 文件，我得到错误
javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
我已经尝试过：
按照 Stack O 上的几个线程中所建议的不同方式创建 JAXBContext。（将包作为字符串传递并添加 jaxb.index 和 ObjectFactory.java，传递完整的 class 路径而不仅仅是 class,...) 无济于事，在我看来（阅读错误）问题不是我将 SettingsModel class 传递给上下文的方式...
@XmlSeealso 解决方法也经常被提及，但我并没有立即看到它在我的案例中有任何用处（这并不是说我要编组一个 subclass或 smth)
还尝试从子包中重构 SaveButton.java，使其与 SettingsModel 处于同一级别，但这并没有改变任何东西...
我完全不知道我应该如何以及为什么将 SaveButton 包含到 jaxbContext 中，当我尝试时我遇到了很多错误。
我的代码：
// SettingsModel.java
@XmlRootElement(name = "robot")
@XmlAccessorType(XmlAccessType.FIELD)
public class SettingsModel implements Observable {
private boolean valid = true;
//registered views List
//annotate as Type Object.Class because JAXB cannot handle interfaces
@XmlElement(type = Object.class)
private ArrayList<InvalidationListener> listenersList;
//list all variable robot/vehicle specs
//filename is needed for saving to current or new file
@XmlElement(name = "filename")
private String fileName;
@XmlElement(name = "vehicle-width")
private double vehicleWidth;
@XmlElement(name = "work-width")
private double workWidth;
// other getters and setters without logic are removed
public void setValid(boolean valid) {
if (valid != this.valid) {
this.valid = valid;
fireInvalidationEvent();
}
}
public void setVehicleWidth(double vehicleWidth) {
this.vehicleWidth = vehicleWidth;
Field.getInstance().getRobot().setVehicleWidth(vehicleWidth);
fireInvalidationEvent();
}
public void setWorkWidth(double workWidth) {
this.workWidth = workWidth;
// Field.getInstance().getRobot().setVehicleWidth(vehicleWidth);
// fireInvalidationEvent();
}
//METHODS AND FUNCTIONS
@Override
public void addListener(InvalidationListener invalidationListener) {
listenersList.add(invalidationListener);
}
@Override
public void removeListener(InvalidationListener invalidationListener) {
listenersList.remove(invalidationListener);
}
public void fireInvalidationEvent() {
for (InvalidationListener listener : listenersList) {
listener.invalidated(this);
}
}
}
// SaveButton.java
public class SaveButton extends Button implements InvalidationListener {
private SettingsModel model;
public SaveButton(SettingsModel model) {
this.model = model;
model.addListener(this);
setText("SAVE SETTINGS");
setOnMouseClicked((ev)->{
try {
saveSettings();
} catch (JAXBException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
});
}
private void saveSettings() throws JAXBException, FileNotFoundException {
String filename = model.getFileName();
Object[] options = {"Save", "Save As"};
//choose Save or Save As
int choice = JOptionPane.showOptionDialog(null,"Overwrite current file or Save As New file?",
"Save Settings",
JOptionPane.WARNING_MESSAGE,
JOptionPane.YES_NO_OPTION,
null,
options,
options[0]
);
if(choice != JOptionPane.OK_OPTION){
filename = JOptionPane.showInputDialog("Enter new file name");
model.setFileName(filename);
}
System.out.println(model.getFileName());
//Marshal
JAXBContext jaxbContext = JAXBContext.newInstance(SettingsModel.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
//if filename stays same, file is overwritten. Test only SAVE AS until code works to not lose default file
File file = new File("src/resources/properties/"+ filename + ".xml");
OutputStream os = new FileOutputStream(file);
jaxbMarshaller.marshal(model,os);
}
@Override
public void invalidated(Observable observable) {
System.out.println("button invalidated: "+ model.isValid());
setDisable(!model.isValid());
}
}
堆栈跟踪：
javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.SAXException2: javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.]
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:301)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:226)
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:80)
at settings.settingsWidgets.SaveButton.saveSettings(SaveButton.java:59)
at settings.settingsWidgets.SaveButton.lambda$new[=14=](SaveButton.java:27)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3564)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.access00(Scene.java:3492)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3860)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access00(Scene.java:3579)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: com.sun.istack.SAXException2: javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:217)
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:232)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:623)
at com.sun.xml.bind.v2.runtime.property.ArrayElementNodeProperty.serializeItem(ArrayElementNodeProperty.java:39)
at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:142)
at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:129)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:329)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:563)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:310)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:464)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:298)
... 34 more
Caused by: javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:563)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:618)
... 42 more
Process finished with exit code 0
如有任何见解，我们将不胜感激。
您的 SettingsModel 有一个标记为 xml 元素的 listenerList。您使用以下行将 SaveButton 添加到列表中：
model.addListener(this);
因此，当编组 SettingsModel 时，JAXB 会处理 listenerList 并尝试编组 SaveButton，但它不知道该怎么做。
将 @XmlRootElement 注释添加到您的 SaveButton class 应该就足够了。
此外，我看到您在每次单击按钮时都创建了一个 JAXBContext。 JAXB 规范说：
To avoid the overhead involved in creating a JAXBContext instance, a
JAXB application is encouraged to reuse a JAXBContext instance. An
implementation of abstract class JAXBContext is required to be
thread-safe, thus, multiple threads in an application can share the
same JAXBContext instance.
您应该将 JAXBContext 移动到静态字段，因为实例可以重复使用。
我已经阅读了几个关于这个主题的帖子，但其中 none 似乎回答了我的具体问题。在包 "settings" 中，我有一个 SettingModel.java class 使用 jaxb 从 default.xml 文件加载默认设置。这完美无缺。然后，在同一个包下，在一个名为 SettingsWidgets 的子包中，我有一个 SaveButton.java class，它有一个 setOnMouseClick eventListener，触发一个方法 "saveSettings".该代码部分工作：当前文件被覆盖（尽管无效）或在所需包中创建新的（但为空）xml 文件，我得到错误
javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
我已经尝试过：
按照 Stack O 上的几个线程中所建议的不同方式创建 JAXBContext。（将包作为字符串传递并添加 jaxb.index 和 ObjectFactory.java，传递完整的 class 路径而不仅仅是 class,...) 无济于事，在我看来（阅读错误）问题不是我将 SettingsModel class 传递给上下文的方式...
@XmlSeealso 解决方法也经常被提及，但我并没有立即看到它在我的案例中有任何用处（这并不是说我要编组一个 subclass或 smth)
还尝试从子包中重构 SaveButton.java，使其与 SettingsModel 处于同一级别，但这并没有改变任何东西...
我完全不知道我应该如何以及为什么将 SaveButton 包含到 jaxbContext 中，当我尝试时我遇到了很多错误。
我的代码：
// SettingsModel.java
@XmlRootElement(name = "robot")
@XmlAccessorType(XmlAccessType.FIELD)
public class SettingsModel implements Observable {
private boolean valid = true;
//registered views List
//annotate as Type Object.Class because JAXB cannot handle interfaces
@XmlElement(type = Object.class)
private ArrayList<InvalidationListener> listenersList;
//list all variable robot/vehicle specs
//filename is needed for saving to current or new file
@XmlElement(name = "filename")
private String fileName;
@XmlElement(name = "vehicle-width")
private double vehicleWidth;
@XmlElement(name = "work-width")
private double workWidth;
// other getters and setters without logic are removed
public void setValid(boolean valid) {
if (valid != this.valid) {
this.valid = valid;
fireInvalidationEvent();
}
}
public void setVehicleWidth(double vehicleWidth) {
this.vehicleWidth = vehicleWidth;
Field.getInstance().getRobot().setVehicleWidth(vehicleWidth);
fireInvalidationEvent();
}
public void setWorkWidth(double workWidth) {
this.workWidth = workWidth;
// Field.getInstance().getRobot().setVehicleWidth(vehicleWidth);
// fireInvalidationEvent();
}
//METHODS AND FUNCTIONS
@Override
public void addListener(InvalidationListener invalidationListener) {
listenersList.add(invalidationListener);
}
@Override
public void removeListener(InvalidationListener invalidationListener) {
listenersList.remove(invalidationListener);
}
public void fireInvalidationEvent() {
for (InvalidationListener listener : listenersList) {
listener.invalidated(this);
}
}
}
// SaveButton.java
public class SaveButton extends Button implements InvalidationListener {
private SettingsModel model;
public SaveButton(SettingsModel model) {
this.model = model;
model.addListener(this);
setText("SAVE SETTINGS");
setOnMouseClicked((ev)->{
try {
saveSettings();
} catch (JAXBException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
});
}
private void saveSettings() throws JAXBException, FileNotFoundException {
String filename = model.getFileName();
Object[] options = {"Save", "Save As"};
//choose Save or Save As
int choice = JOptionPane.showOptionDialog(null,"Overwrite current file or Save As New file?",
"Save Settings",
JOptionPane.WARNING_MESSAGE,
JOptionPane.YES_NO_OPTION,
null,
options,
options[0]
);
if(choice != JOptionPane.OK_OPTION){
filename = JOptionPane.showInputDialog("Enter new file name");
model.setFileName(filename);
}
System.out.println(model.getFileName());
//Marshal
JAXBContext jaxbContext = JAXBContext.newInstance(SettingsModel.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
//if filename stays same, file is overwritten. Test only SAVE AS until code works to not lose default file
File file = new File("src/resources/properties/"+ filename + ".xml");
OutputStream os = new FileOutputStream(file);
jaxbMarshaller.marshal(model,os);
}
@Override
public void invalidated(Observable observable) {
System.out.println("button invalidated: "+ model.isValid());
setDisable(!model.isValid());
}
}
堆栈跟踪：
javax.xml.bind.MarshalException
- with linked exception:
[com.sun.istack.SAXException2: javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.]
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:301)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:226)
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:80)
at settings.settingsWidgets.SaveButton.saveSettings(SaveButton.java:59)
at settings.settingsWidgets.SaveButton.lambda$new[=14=](SaveButton.java:27)
at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3564)
at javafx.graphics/javafx.scene.Scene$ClickGenerator.access00(Scene.java:3492)
at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3860)
at javafx.graphics/javafx.scene.Scene$MouseHandler.access00(Scene.java:3579)
at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2588)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:397)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent(GlassViewEventHandler.java:434)
at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:390)
at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:433)
at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop(WinApplication.java:174)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: com.sun.istack.SAXException2: javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:217)
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:232)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:623)
at com.sun.xml.bind.v2.runtime.property.ArrayElementNodeProperty.serializeItem(ArrayElementNodeProperty.java:39)
at com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.serializeListBody(ArrayElementProperty.java:142)
at com.sun.xml.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:129)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:329)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:563)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:310)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:464)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:298)
... 34 more
Caused by: javax.xml.bind.JAXBException: class settings.settingsWidgets.SaveButton nor any of its super class is known to this context.
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:563)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsXsiType(XMLSerializer.java:618)
... 42 more
Process finished with exit code 0
如有任何见解，我们将不胜感激。
您的 SettingsModel 有一个标记为 xml 元素的 listenerList。您使用以下行将 SaveButton 添加到列表中：
model.addListener(this);
因此，当编组 SettingsModel 时，JAXB 会处理 listenerList 并尝试编组 SaveButton，但它不知道该怎么做。
将 @XmlRootElement 注释添加到您的 SaveButton class 应该就足够了。
此外，我看到您在每次单击按钮时都创建了一个 JAXBContext。 JAXB 规范说：
To avoid the overhead involved in creating a JAXBContext instance, a JAXB application is encouraged to reuse a JAXBContext instance. An implementation of abstract class JAXBContext is required to be thread-safe, thus, multiple threads in an application can share the same JAXBContext instance.
您应该将 JAXBContext 移动到静态字段，因为实例可以重复使用。