如何使用Jackson数据格式。xml来序列化java中的LookAndFeel对象？
在Java JDK 14.0.1中
当我尝试序列化时：
private LookAndFeel lookAndFeel = new FlatLightLaf();
// I am obviously creating this in a working object as the serializing in xml with jackson has been successful until this specific object was added.
它使用https://www.formdev.com/flatlaf/作为maven依赖项存储
使用pom中的com.fasterxml.jackson.dataformat.xml。xml和com.fasterxml.woodstox-core我听说可以防止某些错误：
<dependency>
<groupId>com.formdev</groupId>
<artifactId>flatlaf</artifactId>
<version>0.36</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-xml</artifactId>
<version>2.11.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.woodstox</groupId>
<artifactId>woodstox-core</artifactId>
<version>5.1.0</version>
</dependency>
具有以下序列化功能：
public void serializeSettings(Settings settings, File directoryToStore) {
XmlMapper xmlMapper = new XmlMapper();
try {
xmlMapper.writeValue(directoryToStore, settings);
} catch (JsonGenerationException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
它使用的是一个设置对象（我将提供的不是完整的对象，而是引起问题的变量的一个尽可能小的表示，请记住，我已经删除或缩短了大部分java文档，使其更易于阅读）：
设置。爪哇
package com.pygame_studio.settings;
import java.io.File;
import javax.swing.LookAndFeel;
import com.pygame_studio.settings.appearance_and_behavior.AppearanceAndBehavior;
public class Settings {
private File storedSettingsFile; // Where the settings .xml file is stored.
private AppearanceAndBehavior appearanceAndBehavior; // Stores all the settings to do with the appearance and behavior of Pygame Studio.
public Settings() {
super();
}
public Settings(File storedSettingsFile,
/*Appearance And Behavior settings*/
LookAndFeel lookAndFeel) {
this.setStoredSettingsFile(storedSettingsFile);
this.setAppearanceAndBehavior(new AppearanceAndBehavior(lookAndFeel));
}
public Settings(File storedSettingsFile,
AppearanceAndBehavior appearanceAndBehavior) {
this.setStoredSettingsFile(storedSettingsFile);
this.setAppearanceAndBehavior(appearanceAndBehavior);
}
/**
* @return storedSettingsFile
*/
public File getStoredSettingsFile() {
return storedSettingsFile;
}
/**
* @param storedSettingsFile - storedSettingsFile to set.
*/
public void setStoredSettingsFile(File storedSettingsFile) {
this.storedSettingsFile = storedSettingsFile;
}
/**
* @return appearanceAndBehavior
*/
public AppearanceAndBehavior getAppearanceAndBehavior() {
return appearanceAndBehavior;
}
/**
* @param appearanceAndBehavior - appearanceAndBehavior to set.
*/
public void setAppearanceAndBehavior(AppearanceAndBehavior appearanceAndBehavior) {
this.appearanceAndBehavior = appearanceAndBehavior;
}
}
外观和外观。爪哇
package com.pygame_studio.settings.appearance_and_behavior;
import java.io.File;
import javax.swing.LookAndFeel;
public class AppearanceAndBehavior {
private LookAndFeel lookAndFeel; // Stores the look and feel of the program.
public AppearanceAndBehavior() {
super();
}
public AppearanceAndBehavior(LookAndFeel lookAndFeel) {
this.setLookAndFeel(lookAndFeel);
}
/**
* @return - lookAndFeel
*/
public LookAndFeel getLookAndFeel() {
return this.lookAndFeel;
}
/**
* @param lookAndFeel - lookAndFeel to set
*/
public void setLookAndFeel(LookAndFeel lookAndFeel) {
this.lookAndFeel = lookAndFeel;
}
}
我得到以下错误：
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class com.formdev.flatlaf.UIDefaultsLoader$$Lambda$93/0x0000000800c2f040 and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: com.pygame_studio.settings.Settings["appearanceAndBehavior"]->com.pygame_studio.settings.appearance_and_behavior.AppearanceAndBehavior["lookAndFeel"]->com.formdev.flatlaf.FlatLightLaf["defaults"]->javax.swing.UIDefaults["CheckBoxMenuItem.border"])
at com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77)
at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1277)
at com.fasterxml.jackson.databind.DatabindContext.reportBadDefinition(DatabindContext.java:400)
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:71)
at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:33)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:726)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeWithoutTypeInfo(MapSerializer.java:681)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:637)
at com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:33)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializerBase.serializeFields(XmlBeanSerializerBase.java:212)
at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializer.serialize(XmlBeanSerializer.java:129)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializerBase.serializeFields(XmlBeanSerializerBase.java:212)
at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializer.serialize(XmlBeanSerializer.java:129)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:728)
at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializerBase.serializeFields(XmlBeanSerializerBase.java:212)
at com.fasterxml.jackson.dataformat.xml.ser.XmlBeanSerializer.serialize(XmlBeanSerializer.java:129)
at com.fasterxml.jackson.dataformat.xml.ser.XmlSerializerProvider.serializeValue(XmlSerializerProvider.java:109)
at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:4374)
at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:3570)
at com.pygame_studio.settings.SettingsManager.serializeSettings(SettingsManager.java:41)
at com.pygame_studio.PygameStudio.<init>(PygameStudio.java:24)
at com.pygame_studio.PygameStudio.main(PygameStudio.java:31)
我知道“CheckBoxMenuItem.border”可能没有一个公共的getter和setter，因为我已经对这个错误进行了研究，但我认为我不能改变这一点
我尝试了一个解决方案：Serializing with Jackson (JSON) - getting "No serializer found"?
在初始化xmlMapper之后直接放置：xmlMapper.setVisibility(javax.swing.UIDefaults.CheckBoxMenuItem.border.FIELD, Visibility.ANY);
但是，这会产生一个错误，说明CheckBoxMenuItem属性不存在
为什么会发生No serializer found错误
如何修复
编辑：根据建议，我尝试了xmlMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);在我的serializeSettings()方法中，但是我得到了以下警告：
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.fasterxml.jackson.databind.util.ClassUtil (file:/C:/Users/Eno/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.11.1/jackson-databind-2.11.1.jar) to method sun.awt.SunHints$Value.getIndex()
WARNING: Please consider reporting this to the maintainers of com.fasterxml.jackson.databind.util.ClassUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
而且，当我试图反序列化它们时，我得到了更多的错误，所以我认为这不起作用
# 1 楼答案
不要尝试序列化类FlatLightLaf（或任何其他LookAndFeel类）。它不是为可序列化而设计的，这样做毫无意义。我是FlatLaf的作者
使用look and feel的类名（作为字符串）
对于searialization使用：
对于反序列化，请使用：