未捕获 IllegalStateException

Question

我想在 Scala 中捕获 IllegalStateException。以下代码

val scene = new SceneDock

如果之前未启动 JavaFX 应用程序，则抛出 IllegalStateException。这个构造函数来自 JemmyFX 框架。

所以我想通过以下方式捕获这个异常：

try{
 val scene = new SceneDock
 "running"}
catch{
 case e: IllegalStateException => { "stopped" } }

但它不起作用。输出始终是 IllegalStateException: Toolkit not initialized 并且它会重复，直到我终止应用程序。已经尝试过捕获异常，并用Java尝试过，但总是相同的结果。

堆栈跟踪（它会重复，直到我终止应用程序）：

java.lang.IllegalStateException: Toolkit not initialized
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:155)
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:150)
at javafx.application.Platform.runLater(Platform.java:52)
at org.jemmy.fx.QueueExecutor.executeQueue(QueueExecutor.java:98)
at org.jemmy.action.AbstractExecutor.execute(AbstractExecutor.java:100)
at org.jemmy.fx.SceneList.getControls(SceneList.java:58)
at org.jemmy.lookup.PlainLookup.getChildren(PlainLookup.java:76)
at org.jemmy.lookup.AbstractLookup.refresh(AbstractLookup.java:172)
at org.jemmy.lookup.AbstractLookup$1.reached(AbstractLookup.java:141)
at org.jemmy.lookup.AbstractLookup$1.reached(AbstractLookup.java:137)
at org.jemmy.timing.Waiter.waitState(Waiter.java:78)
at org.jemmy.timing.Waiter.ensureState(Waiter.java:119)
at org.jemmy.lookup.AbstractLookup.wait(AbstractLookup.java:137)
at org.jemmy.lookup.AbstractLookup.get(AbstractLookup.java:250)
at org.jemmy.lookup.AbstractLookup.wrap(AbstractLookup.java:210)
at org.jemmy.dock.Dock.lookup(Dock.java:75)
at org.jemmy.fx.SceneDock.<init>(SceneDock.java:20)
at org.jemmy.fx.SceneDock.<init>(SceneDock.java:32)
at org.jemmy.fx.SceneDock.<init>(SceneDock.java:60)
at org.djemmysl.main.DjemmySL$class.applicationStatus(DjemmySL.scala:25)
at org.djemmysl.main.Main$.applicationStatus(Main.scala:3)
at org.djemmysl.main.Main$.main(Main.scala:6)
at org.djemmysl.main.Main.main(Main.scala)

java.lang.IllegalStateException: Toolkit not initialized
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:155)
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:150)
at javafx.application.Platform.runLater(Platform.java:52)
at org.jemmy.fx.QueueExecutor.executeQueue(QueueExecutor.java:98)
at org.jemmy.action.AbstractExecutor.execute(AbstractExecutor.java:100)
at org.jemmy.fx.SceneList.getControls(SceneList.java:58)
at org.jemmy.lookup.PlainLookup.getChildren(PlainLookup.java:76)
at org.jemmy.lookup.AbstractLookup.refresh(AbstractLookup.java:172)
at org.jemmy.lookup.AbstractLookup$1.reached(AbstractLookup.java:141)
at org.jemmy.lookup.AbstractLookup$1.reached(AbstractLookup.java:137)
at org.jemmy.timing.Waiter.waitState(Waiter.java:78)
at org.jemmy.timing.Waiter.ensureState(Waiter.java:119)
at org.jemmy.lookup.AbstractLookup.wait(AbstractLookup.java:137)
at org.jemmy.lookup.AbstractLookup.get(AbstractLookup.java:250)
at org.jemmy.lookup.AbstractLookup.wrap(AbstractLookup.java:210)
at org.jemmy.dock.Dock.lookup(Dock.java:75)
at org.jemmy.fx.SceneDock.<init>(SceneDock.java:20)
at org.jemmy.fx.SceneDock.<init>(SceneDock.java:32)
at org.jemmy.fx.SceneDock.<init>(SceneDock.java:60)
at org.djemmysl.main.DjemmySL$class.applicationStatus(DjemmySL.scala:25)
at org.djemmysl.main.Main$.applicationStatus(Main.scala:3)
at org.djemmysl.main.Main$.main(Main.scala:6)
at org.djemmysl.main.Main.main(Main.scala)

Answer 1

实例化SceneDock 稍等片刻（我猜默认为 10 秒），直到启动 jemmy fx 应用程序。 在此等待期间，它会定期（默认为每 100 毫秒）查找是否已通过在 javafx thread（使用 Platform.runLater(Runnable)）中执行任务打开了窗口。

当没有应用程序启动时调用Platform.runLater(Runnable)，一个java.lang.IllegalStateException被抛出，捕获并打印到错误输出：

java.lang.IllegalStateException: Toolkit not initialized
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:153)
at com.sun.javafx.application.PlatformImpl.runLater(PlatformImpl.java:148)
    ...

如果一段时间后没有申请，你应该得到一个org.jemmy.TimeoutExpiredException：

org.jemmy.TimeoutExpiredException: State 'Waiting for 1 javafx.scene.Scene controls to be found adhering to org.jemmy.lookup.Any@65e7c41f' has not been reached in 10000 milliseconds
at org.jemmy.timing.Waiter.ensureState(Waiter.java:121)
at org.jemmy.lookup.AbstractLookup.wait(AbstractLookup.java:138)
    ...

我通过以下代码得到了这种行为：

import org.jemmy.TimeoutExpiredException;
import org.jemmy.fx.SceneDock;
import org.junit.Test;

public class TestX {

    @Test
    public void notInitializedToolkit() {
        try {
            new SceneDock();

        } catch (TimeoutExpiredException e) {
            System.err.println("The application have not been launched");
        }
    }
}