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javafx - JavaFX - WebEngine.executeScript() 中的看门狗定时器

问题描述

在以下代码中：

public void onButtonClick(ActionEvent actionEvent) { 
    webView.getEngine().getLoadWorker().
         stateProperty().addListener(new ChangeListener<Worker.State>() {
    @Override
    public void changed(ObservableValue<? extends Worker.State> observable, Worker.State oldValue, Worker.State newValue) {
       if (newValue == Worker.State.SUCCEEDED)
           webView.getEngine().executeScript("window.scrollTo(0,document.body.scrollHeight);");
     }});
     webView.getEngine().loadContent("some content");
}

这段代码工作得很好，问题是这一行：

webView.getEngine().executeScript("window.scrollTo(0, document.body.scrollHeight);");

正在创建一个无限循环线程，该线程在应用程序终止时不会终止，因此产生此异常：

java.lang.IllegalThreadStateException
at java.lang.ThreadGroup.destroy (ThreadGroup.java:778)
at org.codehaus.mojo.exec.ExecJavaMojo.execute (ExecJavaMojo.java:328)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
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:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
at org.codehaus.classworlds.Launcher.main (Launcher.java:47)

我知道那一行是Thread用 name产生这个的"Watchdog-Timer-1"，因为如果不执行那一行，它就Thread永远不会启动并且应用程序正常关闭。

任何想法为什么会发生这种情况？

标签： javafxwebviewthread-safety

解决方案

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