JavaFX 2 - 捕捉所有运行时异常 [英] JavaFX 2 - Catching all runtime exceptions

问题描述

我试过

  Thread.setDefaultUncaughtExceptionHandler ... 
  / pre> 
 
 
 
 
在主要，也在开始（Stage primaryStage）方法。它不工作。
 
我也尝试过
 
  public static void main（String [ ] args）{
 try {
 launch（args）; 
} catch（Throwable t）{
 System.out.println（t.getMessage）; 
} 
} 
  
 
 
 
 
 
异常堆栈跟踪。
 
 
在javafx.concurrent.Task $ TaskCallable $ 2.run（Task.java:1251 ）
 com.sun.javafx.application.PlatformImpl $ 3.run（PlatformImpl.java:141）
 at com.sun.glass.ui.gtk.GtkApplication._runLoop（Native Method）at 
 com.sun.glass.ui.gtk.GtkApplication $ 1 $ 1.run（GtkApplication.java:56）
在java.lang.Thread.run（Thread.java:662）
 
 
感谢您的帮助。
解决方案
对于 Platform.runLater（）（见下文），您会看到异常被吞噬（第146/147行），因此默认未捕获的异常处理程序将无法抓住它们 - 基于这段代码，我不认为你有任何选择，但是在你的runnable中包含try / catch块。
 
 
 
请注意，此问题已被报告（需要登录 - 注册是免费的），并应在Lombard（ = Java FX 8.0将于明年发布Java 8）
 
 
 
您可以创建一个实用程序方法并调用
  Platform.runLater（getFxWrapper（yourRunnable））; 
 
 public static Runnable getFxWrapper（final Runnable r）{
 return new Runnable（）{
 
 @Override 
 public void run（）{
 try {
 r.run（）; 
} catch（Exception e）{
 //这里你可能想要记录一些东西
 System.out.println（Found an exception）; 
} 
} 
}; 
} 
  
 代码 Platform.runLater  ：
  120 private static void runLater（final Runnable r，boolean exiting）{ 
 121 if（！initialized.get（））{
 122 throw new IllegalStateException（Toolkit not initialized）; 
 123} 
 124 
 125 pendingRunnables.incrementAndGet（）; 
 126 waitForStart（）; 
 127 
 128 if（SystemProperties.isDebug（））{
 129 Toolkit.getToolkit（）。pauseCurrentThread（）; 
 130} 
 131 
 132 synchronized（runLaterLock）{
 133 if（！exiting&& toolkitExit.get（））{
 134 // Don'在我们退出工具包
 135 pendingRunnables.decrementAndGet（）; 
 136返回; 
 137} 
 138 
 139 Toolkit.getToolkit（）。defer（new Runnable（）{
 140 @Override public void run（）{
 141 try {
 142 r.run（）; 
 143 pendingRunnables.decrementAndGet（）; 
 144 checkIdle（）; 
 145} catch（Throwable t）{
 146 System.err .println（runnable中的异常）; 
 147 t.printStackTrace（）; 
 148} 
 149} 
 150}）; 
 151} 
 152} 
  
 
I tried
Thread.setDefaultUncaughtExceptionHandler...


in the main, and also in the start(Stage primaryStage) method.  It ain't working.

I also tried
public static void main(String[] args) {
 try {
  launch(args);
 }catch(Throwable t) {
  System.out.println(t.getMessage);
 }
}



Exception stack trace.

  
at javafx.concurrent.Task$TaskCallable$2.run(Task.java:1251)  at
  com.sun.javafx.application.PlatformImpl$3.run(PlatformImpl.java:141)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)  at
  com.sun.glass.ui.gtk.GtkApplication$1$1.run(GtkApplication.java:56)
    at java.lang.Thread.run(Thread.java:662)
Thanks for helping.
解决方案
If you check the code for Platform.runLater() (see below), you will see that the exceptions are swallowed (lines 146 / 147), so a default uncaught exception handler won't be able to catch them - based on that piece of code, I don't think you have any options but to include try/catch blocks in your runnables.

Note that this issue has been reported (requires login - registration is free) and should be fixed in Lombard (= Java FX 8.0 to be released with Java 8 next year).

You could alternatively create a utility method and call 
Platform.runLater(getFxWrapper(yourRunnable));

public static Runnable getFxWrapper(final Runnable r) {
    return new Runnable() {

        @Override
        public void run() {
            try {
                r.run();
            } catch (Exception e) {
                //here you probably want to log something
                System.out.println("Found an exception");
            }
        }
    };
}
Code of Platform.runLater:
  120     private static void runLater(final Runnable r, boolean exiting) {
  121         if (!initialized.get()) {
  122             throw new IllegalStateException("Toolkit not initialized");
  123         }
  124 
  125         pendingRunnables.incrementAndGet();
  126         waitForStart();
  127 
  128         if (SystemProperties.isDebug()) {
  129             Toolkit.getToolkit().pauseCurrentThread();
  130         }
  131 
  132         synchronized (runLaterLock) {
  133             if (!exiting && toolkitExit.get()) {
  134                 // Don't schedule a runnable after we have exited the toolkit
  135                 pendingRunnables.decrementAndGet();
  136                 return;
  137             }
  138 
  139             Toolkit.getToolkit().defer(new Runnable() {
  140                 @Override public void run() {
  141                     try {
  142                         r.run();
  143                         pendingRunnables.decrementAndGet();
  144                         checkIdle();
  145                     } catch (Throwable t) {
  146                         System.err.println("Exception in runnable");
  147                         t.printStackTrace();
  148                     }
  149                 }
  150             });
  151         }
  152     }


                        
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