Statements inside catch block doesn't execute

Question

In the following code, I have used a wrong file name (wrongFileName.fxml) to get loaded, in order to test catch block. However, the statements inside the catch block doesn't execute. Please note, even when there is no statement to print the stack trace on the console, still stack trace gets printed. Please let me know, why this is happening?

public class First extends Application {

    @Override
    public void start(Stage stage){
        Parent root = null;
        try {
            root = FXMLLoader.load(getClass().getResource("wrongFileName.fxml"));
        } catch (IOException ex) {
            System.out.println("SomeTextForCheck");
        }
    }
}

Stack trace:

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.javafx.main.Main.launchApp(Main.java:698)
    at com.javafx.main.Main.main(Main.java:871)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2773)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2757)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2743)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2730)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2719)
    at first.First.start(First.java:29)
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:216)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
    at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:89)
    ... 1 more

have you tried `catch (Exception ex)` instead of `catch (IOException ex)`? — Baby, Jan 13 '14 at 02:47
Is that really throwing IOException? Otherwise if you catch the Exception class itself, it will helps you. — Venkatesh Achanta, Jan 13 '14 at 02:50
catch (Exception ex) prints out the text in System.out.println(), but also prints Stack trace. Is it how it should be? Thanks! — Vaib, Jan 13 '14 at 02:50
[This answer to another question](http://stackoverflow.com/questions/12318861/javafx-2-catching-all-runtime-exceptions/12798390#12798390) may explain where the exception gets caught and where the stacktrace gets printed. — fabian, Jan 13 '14 at 03:00

score 0 · Accepted Answer · answered Jan 13 '14 at 03:12

From the stack trace, RuntimeException is thrown. So Kindly handle the RuntimeException and Exception class in your code. Always log the exception or use stacktrace otherwise its difficult to debug.
public class First extends Application {

@Override
public void start(Stage stage){
    Parent root = null;
    try {
        root = FXMLLoader.load(getClass().getResource("wrongFileName.fxml"));
    } catch (IOException ex) {
        System.out.println("SomeTextForCheck");
        ex.printStackTrace() 
    }
    catch(RuntimeException ex) {
        System.out.println("SomeTextForCheck");
        ex.printStackTrace()
    }
    catch(Exception ex) {
        System.out.println("SomeTextForCheck");
        ex.printStackTrace()  
    }
}

Thanks! It helped me to understand better. – Vaib Jan 13 '14 at 03:45 — Vaib, Jan 13 '14 at 03:45

score 0 · Answer 2 · answered Jan 13 '14 at 03:22

0

You need to catch the right exception to print the stack trace. Ideally you shouldn't be getting exceptions like NullPointerException, developers need to handle such conditions in the code.

answered Jan 13 '14 at 03:22

Sudhanshu Umalkar

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Statements inside catch block doesn't execute

2 Answers2