Spring AOP 代理不适用于 JavaFX
Spring AOP proxies does not work with JavaFX
美好的一天，我正在开发一个在 JavaFX 上使用 Spring AOP 的项目，不幸的是，当我尝试包装在 JavaFX 场景中使用的接口时，我收到一个空指针。这是堆栈跟踪。
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication7(LauncherImpl.java:157)
at com.sun.javafx.application.LauncherImpl$$Lambda/756185697.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at javafx.scene.Node.getScene(Node.java:907)
at javafx.scene.Scene.invalidated(Scene.java:1074)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145)
at javafx.scene.Scene.setRoot(Scene.java:1038)
at javafx.scene.Scene.<init>(Scene.java:325)
at javafx.scene.Scene.<init>(Scene.java:181)
at com.hccs.sample.aspectj.Main.start(Main.java:42)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication13(LauncherImpl.java:821)
at com.sun.javafx.application.LauncherImpl$$Lambda/50630420.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait6(PlatformImpl.java:323)
at com.sun.javafx.application.PlatformImpl$$Lambda/1051754451.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null4(PlatformImpl.java:292)
at com.sun.javafx.application.PlatformImpl$$Lambda/1570685826.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater5(PlatformImpl.java:291)
at com.sun.javafx.application.PlatformImpl$$Lambda/1775282465.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null1(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda/1109371569.run(Unknown Source)
... 1 more
Exception running application com.hccs.sample.aspectj.Main
这是 Main 方法，我在其中创建 MyScene 接口的实例并使用代理对其进行包装。
public class Main extends Application {
private static ApplicationContext context;
public static void main(String[] args) {
context = new AnnotationConfigApplicationContext(AppConfig.class);
Application.launch(Main.class);
}
@Override
public void start(Stage primaryStage) throws Exception {
MyScene scene = context.getBean(MyScene.class);
if (scene == null) {
System.out.println("Scene is null on creation");
System.exit(0);
} else {
System.out.println("Scene is not null on creation.");
}
// these code are the source of the problem, when these code are
// commented, it works fine.
scene = ProxyWrapper.wrap(scene);
if (scene == null) {
System.out.println("Scene is null on wrapping");
System.exit(0);
} else {
System.out.println("Scene is not null on wrapping");
}
// comment it up to here
// No problem with manual invocation of methods
scene.eventOne();
scene.eventTwo();
scene.eventThree();
// Where null pointer occurs
primaryStage.setScene(new Scene((Parent) scene));
primaryStage.show();
}
}
这是应用程序配置。
@Configuration
@ComponentScan(basePackages = { "com.hccs.sample.aspectj" })
public class AppConfig {
}
这里是需要封装的场景接口和实现
public interface MyScene {
public void initialize();
public void eventOne();
public void eventTwo();
public void eventThree();
}
@Lazy
@Component
public class MySceneImpl extends BorderPane implements MyScene {
@FXML
private Button cmdOne;
@FXML
private Button cmdTwo;
@FXML
private Button cmdThree;
public MySceneImpl() {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource(
"/com/hccs/sample/aspectj/resources/MyScene.fxml"));
loader.setRoot(this);
loader.setController(this);
loader.load();
System.out.println("\nKARDS!!\n");
} catch (Exception e) {
e.printStackTrace();
}
}
@FXML
@Override
public void initialize() {
}
@FXML
@Override
public void eventOne() {
System.out.println("One");
}
@FXML
@Override
public void eventTwo() {
loopToTen();
}
@Override
public void eventThree() {
new Thread() {
@Override
public void run() {
loopToTen();
}
}.start();
}
private void loopToTen() {
for (int c = 0; c < 10; c++) {
try {
Thread.sleep(100);
System.out.println(c + 1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
这里是场景中使用的FXML，
<fx:root type="BorderPane" xmlns:fx="http://javafx.com/fxml/1"
xmlns="http://javafx.com/javafx/8">
<center>
<HBox alignment="CENTER" spacing="10.0" BorderPane.alignment="CENTER">
<children>
<Button fx:id="cmdOne" mnemonicParsing="false" onAction="#eventOne"
text="One" />
<Button fx:id="cmdTwo" mnemonicParsing="false" onAction="#eventTwo"
text="Two" />
<Button fx:id="cmdThree" mnemonicParsing="false" onAction="#eventThree"
text="Three" />
</children>
</HBox>
</center>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</fx:root>
这是环绕场景的Class。
public class ProxyWrapper {
@SuppressWarnings("unchecked")
public static <T> T wrap(T scene) {
MyPointcut pointcut = new MyPointcut();
MyMethodInterceptor aspect = new MyMethodInterceptor();
Advisor advisor = new DefaultPointcutAdvisor(pointcut, aspect);
ProxyFactory pf = new ProxyFactory();
pf.setTarget(scene);
pf.addAdvisor(advisor);
return (T) pf.getProxy();
}
}
这是切入点和 MethodInterceptor 类。
public class MyPointcut extends DynamicMethodMatcherPointcut {
@Override
public ClassFilter getClassFilter() {
return new ClassFilter() {
@Override
public boolean matches(Class<?> clazz) {
return clazz.getName().contains("MyScene");
}
};
}
@Override
public boolean matches(Method method, Class<?> clazz, Object[] key) {
System.out.println(method.getName() + " == event "
+ method.getName().contains("event"));
return method.getName().contains("eventT");
}
}
@Aspect
public class MyMethodInterceptor implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
System.out.println("START: " + invocation.getMethod().getName());
Object val = invocation.proceed();
System.out.println("END: " + invocation.getMethod().getName());
return val;
}
}
最后这是项目的pom.xml。
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hccs.sample</groupId>
<artifactId>sample-aspectj</artifactId>
<version>1.0.0</version>
<name>sample-aspectj</name>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.5</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.5</version>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
如果我有办法让 javafx 识别 spring aop 代理，请分享并帮助我，谢谢！
我不太明白为什么会失败，但是让 MySceneImpl 成为 BorderPane 的子 class 是导致问题的原因。基本上，为拦截方法而创建的代理不会正确初始化 BorderPane 实例。
解决方法是使用聚合而不是继承。添加方法 MyScene:
public Parent getView() ;
并相应地更新实现 class：
@Lazy
@Component
public class MySceneImpl implements MyScene {
@FXML
private Button cmdOne;
@FXML
private Button cmdTwo;
@FXML
private Button cmdThree;
private final BorderPane view ;
public MySceneImpl() {
view = new BorderPane();
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource(
"/application/MyScene.fxml"));
loader.setRoot(view);
loader.setController(this);
loader.load();
System.out.println("\nKARDS!!\n");
} catch (Exception e) {
e.printStackTrace();
}
}
@FXML
@Override
public void initialize() {
}
@Override
public Parent getView() {
return view ;
}
@FXML
@Override
public void eventOne() {
System.out.println("One");
}
@FXML
@Override
public void eventTwo() {
loopToTen();
}
@Override
public void eventThree() {
new Thread() {
@Override
public void run() {
loopToTen();
}
}.start();
}
private void loopToTen() {
for (int c = 0; c < 10; c++) {
try {
Thread.sleep(100);
System.out.println(c + 1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
在这里，它没有使 MySceneImpl 成为 BorderPane 的子 class，而是持有对 BorderPane 实例的引用。该引用将传递给 FXMLLoader 的 setRoot() 方法，因此它会填充 FXML 中定义的按钮。最后，它从 getView() 方法返回。
现在只需更新 Main class 即可调用 getView():
// primaryStage.setScene(new Scene((Parent) scene));
primaryStage.setScene(new Scene(scene.getView()));
美好的一天，我正在开发一个在 JavaFX 上使用 Spring AOP 的项目，不幸的是，当我尝试包装在 JavaFX 场景中使用的接口时，我收到一个空指针。这是堆栈跟踪。
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication7(LauncherImpl.java:157)
at com.sun.javafx.application.LauncherImpl$$Lambda/756185697.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at javafx.scene.Node.getScene(Node.java:907)
at javafx.scene.Scene.invalidated(Scene.java:1074)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:145)
at javafx.scene.Scene.setRoot(Scene.java:1038)
at javafx.scene.Scene.<init>(Scene.java:325)
at javafx.scene.Scene.<init>(Scene.java:181)
at com.hccs.sample.aspectj.Main.start(Main.java:42)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication13(LauncherImpl.java:821)
at com.sun.javafx.application.LauncherImpl$$Lambda/50630420.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait6(PlatformImpl.java:323)
at com.sun.javafx.application.PlatformImpl$$Lambda/1051754451.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null4(PlatformImpl.java:292)
at com.sun.javafx.application.PlatformImpl$$Lambda/1570685826.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater5(PlatformImpl.java:291)
at com.sun.javafx.application.PlatformImpl$$Lambda/1775282465.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null1(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda/1109371569.run(Unknown Source)
... 1 more
Exception running application com.hccs.sample.aspectj.Main
这是 Main 方法，我在其中创建 MyScene 接口的实例并使用代理对其进行包装。
public class Main extends Application {
private static ApplicationContext context;
public static void main(String[] args) {
context = new AnnotationConfigApplicationContext(AppConfig.class);
Application.launch(Main.class);
}
@Override
public void start(Stage primaryStage) throws Exception {
MyScene scene = context.getBean(MyScene.class);
if (scene == null) {
System.out.println("Scene is null on creation");
System.exit(0);
} else {
System.out.println("Scene is not null on creation.");
}
// these code are the source of the problem, when these code are
// commented, it works fine.
scene = ProxyWrapper.wrap(scene);
if (scene == null) {
System.out.println("Scene is null on wrapping");
System.exit(0);
} else {
System.out.println("Scene is not null on wrapping");
}
// comment it up to here
// No problem with manual invocation of methods
scene.eventOne();
scene.eventTwo();
scene.eventThree();
// Where null pointer occurs
primaryStage.setScene(new Scene((Parent) scene));
primaryStage.show();
}
}
这是应用程序配置。
@Configuration
@ComponentScan(basePackages = { "com.hccs.sample.aspectj" })
public class AppConfig {
}
这里是需要封装的场景接口和实现
public interface MyScene {
public void initialize();
public void eventOne();
public void eventTwo();
public void eventThree();
}
@Lazy
@Component
public class MySceneImpl extends BorderPane implements MyScene {
@FXML
private Button cmdOne;
@FXML
private Button cmdTwo;
@FXML
private Button cmdThree;
public MySceneImpl() {
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource(
"/com/hccs/sample/aspectj/resources/MyScene.fxml"));
loader.setRoot(this);
loader.setController(this);
loader.load();
System.out.println("\nKARDS!!\n");
} catch (Exception e) {
e.printStackTrace();
}
}
@FXML
@Override
public void initialize() {
}
@FXML
@Override
public void eventOne() {
System.out.println("One");
}
@FXML
@Override
public void eventTwo() {
loopToTen();
}
@Override
public void eventThree() {
new Thread() {
@Override
public void run() {
loopToTen();
}
}.start();
}
private void loopToTen() {
for (int c = 0; c < 10; c++) {
try {
Thread.sleep(100);
System.out.println(c + 1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
这里是场景中使用的FXML，
<fx:root type="BorderPane" xmlns:fx="http://javafx.com/fxml/1"
xmlns="http://javafx.com/javafx/8">
<center>
<HBox alignment="CENTER" spacing="10.0" BorderPane.alignment="CENTER">
<children>
<Button fx:id="cmdOne" mnemonicParsing="false" onAction="#eventOne"
text="One" />
<Button fx:id="cmdTwo" mnemonicParsing="false" onAction="#eventTwo"
text="Two" />
<Button fx:id="cmdThree" mnemonicParsing="false" onAction="#eventThree"
text="Three" />
</children>
</HBox>
</center>
<padding>
<Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
</padding>
</fx:root>
这是环绕场景的Class。
public class ProxyWrapper {
@SuppressWarnings("unchecked")
public static <T> T wrap(T scene) {
MyPointcut pointcut = new MyPointcut();
MyMethodInterceptor aspect = new MyMethodInterceptor();
Advisor advisor = new DefaultPointcutAdvisor(pointcut, aspect);
ProxyFactory pf = new ProxyFactory();
pf.setTarget(scene);
pf.addAdvisor(advisor);
return (T) pf.getProxy();
}
}
这是切入点和 MethodInterceptor 类。
public class MyPointcut extends DynamicMethodMatcherPointcut {
@Override
public ClassFilter getClassFilter() {
return new ClassFilter() {
@Override
public boolean matches(Class<?> clazz) {
return clazz.getName().contains("MyScene");
}
};
}
@Override
public boolean matches(Method method, Class<?> clazz, Object[] key) {
System.out.println(method.getName() + " == event "
+ method.getName().contains("event"));
return method.getName().contains("eventT");
}
}
@Aspect
public class MyMethodInterceptor implements MethodInterceptor {
@Override
public Object invoke(MethodInvocation invocation) throws Throwable {
System.out.println("START: " + invocation.getMethod().getName());
Object val = invocation.proceed();
System.out.println("END: " + invocation.getMethod().getName());
return val;
}
}
最后这是项目的pom.xml。
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hccs.sample</groupId>
<artifactId>sample-aspectj</artifactId>
<version>1.0.0</version>
<name>sample-aspectj</name>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.5</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.5</version>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
如果我有办法让 javafx 识别 spring aop 代理，请分享并帮助我，谢谢！
我不太明白为什么会失败，但是让 MySceneImpl 成为 BorderPane 的子 class 是导致问题的原因。基本上，为拦截方法而创建的代理不会正确初始化 BorderPane 实例。
解决方法是使用聚合而不是继承。添加方法 MyScene:
public Parent getView() ;
并相应地更新实现 class：
@Lazy
@Component
public class MySceneImpl implements MyScene {
@FXML
private Button cmdOne;
@FXML
private Button cmdTwo;
@FXML
private Button cmdThree;
private final BorderPane view ;
public MySceneImpl() {
view = new BorderPane();
try {
FXMLLoader loader = new FXMLLoader(getClass().getResource(
"/application/MyScene.fxml"));
loader.setRoot(view);
loader.setController(this);
loader.load();
System.out.println("\nKARDS!!\n");
} catch (Exception e) {
e.printStackTrace();
}
}
@FXML
@Override
public void initialize() {
}
@Override
public Parent getView() {
return view ;
}
@FXML
@Override
public void eventOne() {
System.out.println("One");
}
@FXML
@Override
public void eventTwo() {
loopToTen();
}
@Override
public void eventThree() {
new Thread() {
@Override
public void run() {
loopToTen();
}
}.start();
}
private void loopToTen() {
for (int c = 0; c < 10; c++) {
try {
Thread.sleep(100);
System.out.println(c + 1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
在这里，它没有使 MySceneImpl 成为 BorderPane 的子 class，而是持有对 BorderPane 实例的引用。该引用将传递给 FXMLLoader 的 setRoot() 方法，因此它会填充 FXML 中定义的按钮。最后，它从 getView() 方法返回。
现在只需更新 Main class 即可调用 getView():
// primaryStage.setScene(new Scene((Parent) scene));
primaryStage.setScene(new Scene(scene.getView()));