Lambda表达式抛出异常

Question

我刚刚用maven开始了一个新的vaadin项目(com.vaadin:vaadin-archetype-application@7.2.6).

在默认情况下,MyVaadinUI.java我已经用Butten.ClickListener()lambda表达式替换了,之后我在运行时遇到异常package jetty:run

之前:

Button button = new Button("Click Me");
  button.addClickListener(new Button.ClickListener() {
    public void buttonClick(ClickEvent event) {
      layout.addComponent(new Label("Thank you for clicking"));
    }
});
layout.addComponent(button);

后:

Button button = new Button("Click Me");
button.addClickListener(event -> layout.addComponent(new Label("Thank you for clicking")));
layout.addComponent(button);

例外:

2014-08-26 13:23:30.069:WARN:oeja.AnnotationParser:EXCEPTION 
java.lang.ArrayIndexOutOfBoundsException: 1612
    at org.objectweb.asm.ClassReader.readClass(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.eclipse.jetty.annotations.AnnotationParser.scanClass(AnnotationParser.java:899)
    at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:755)
    at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:744)
    at org.eclipse.jetty.annotations.AnnotationParser.parse(AnnotationParser.java:744)
    at org.mortbay.jetty.plugin.MavenAnnotationConfiguration.doParse(MavenAnnotationConfiguration.java:73)
    at org.mortbay.jetty.plugin.MavenAnnotationConfiguration.parseWebInfClasses(MavenAnnotationConfiguration.java:52)
    at org.eclipse.jetty.annotations.AnnotationConfiguration.configure(AnnotationConfiguration.java:119)
    at org.eclipse.jetty.webapp.WebAppContext.configure(WebAppContext.java:468)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1237)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)
    at org.mortbay.jetty.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:298)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:172)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerCollection.doStart(HandlerCollection.java:229)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)
    at org.eclipse.jetty.server.Server.doStart(Server.java:282)
    at org.mortbay.jetty.plugin.JettyServer.doStart(JettyServer.java:65)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:520)
    at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:365)
    at org.mortbay.jetty.plugin.JettyRunMojo.execute(JettyRunMojo.java:523)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:347)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:582)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
    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 org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:46)
    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.intellij.rt.execution.application.AppMain.main(AppMain.java:134)

我在OSX上使用IntelliJ13.1和JDK8

Answer 1

我读了很多关于这个问题的页面，因为我也遇到过这个问题。

对我来说，解决方案很简单，但很难找到。我将 jetty-8.1.10 与 asm-3.3.1 和 primefaces-5.1 一起使用。

当任何带注释的类或带注释的类引用的任何类中有 lambda 表达式时，就会出现问题。

只需将代码从 Java 8 合规性更改为 Java 7 合规性（普通 Java 7 代码中的 lambda 表达式），警告就会消失。这只能调试org.objectweb.asm.ClassReader.

干杯。