英文:
NoClassDefFoundError when trying to register a listener to an EventBus (Google Guava)
问题
在大学的一个项目中，我们必须实现可以通过通道交换消息的参与者。这个通道必须实现为一个事件总线（Guava EventBus）。
当我尝试将一个监听器（part1）注册到事件总线（通道）上时：
channel.register(part1);
在控制台中会出现以下异常。
Exception in thread "main" 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:566)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NoClassDefFoundError: com/google/common/util/concurrent/internal/InternalFutureFailureAccess
at ...
... 更多堆栈信息 ...
Caused by: java.lang.ClassNotFoundException: com.google.common.util.concurrent.internal.InternalFutureFailureAccess
at ...
... 更多堆栈信息 ...
有人可以帮助我吗？
guava.jar 已添加为库。这可能与 jar 文件的实现和类加载器有关。
英文:
In a project for college we have to implement participants which can exchange messages via a channel. This channel has to be realised as a EventBus (Guava).
When I'm trying to register a listener (part1) to the eventbus (channel):
channel.register(part1);
the following Exception appears in the console.
Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NoClassDefFoundError: com/google/common/util/concurrent/internal/InternalFutureFailureAccess
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1095)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:206)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:759)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassInModuleOrNull(BuiltinClassLoader.java:680)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:605)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1095)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:206)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:759)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassInModuleOrNull(BuiltinClassLoader.java:680)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:605)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1095)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:206)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:759)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassInModuleOrNull(BuiltinClassLoader.java:680)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:605)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at com.google.common/com.google.common.cache.LocalCache$LoadingValueReference.<init>(LocalCache.java:3472)
at com.google.common/com.google.common.cache.LocalCache$LoadingValueReference.<init>(LocalCache.java:3476)
at com.google.common/com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2134)
at com.google.common/com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2045)
at com.google.common/com.google.common.cache.LocalCache.get(LocalCache.java:3951)
at com.google.common/com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3974)
at com.google.common/com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4958)
at com.google.common/com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4964)
at com.google.common/com.google.common.eventbus.SubscriberRegistry.getAnnotatedMethods(SubscriberRegistry.java:173)
at com.google.common/com.google.common.eventbus.SubscriberRegistry.findAllSubscribers(SubscriberRegistry.java:164)
at com.google.common/com.google.common.eventbus.SubscriberRegistry.register(SubscriberRegistry.java:74)
at com.google.common/com.google.common.eventbus.EventBus.register(EventBus.java:186)
at commands.Commands.createChannel(Commands.java:243)
at persistence.HSQLDB.resetDatabase(HSQLDB.java:482)
at gui.GUI.start(GUI.java:101)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run$$$capture(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java)
at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Caused by: java.lang.ClassNotFoundException: com.google.common.util.concurrent.internal.InternalFutureFailureAccess
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 55 more
Can anyone help me?
The guava.jar is added as a library. It has to be something with the implementation of the jar and the ClassLoader.
答案1
得分: 3
> Guava在运行时有一个实际所需的依赖项：com.google.guava:failureaccess。
您还需要下载该jar包并将其放在类路径中。
（正如Onur Baştürk建议的那样，某些构建工具会自动处理此过程。）
英文:
> Guava has one real dependency that is needed at runtime: com.google.guava:failureaccess.
You'll need to download that jar and put it on your classpath, too.
(As Onur Baştürk suggests, this happens automatically with some build tools.)
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论