Error display (from different threads)

Hello

I have a program that downloads an xml file.

An error is encountered when I by specifying a non-existent URL in the Http connector (in order to produce an error). I want to display the error on a pop-up message, however, the Simulator gives me an error when I try to view the message.

My code looks like this (short form):

1.  A Button Pressed
2.  Connection thread executed

...

private class Search extends Thread {
  public Search() {
    super();
  }

  public void run() {

     try {
     ...
     code for downloading and parsing file -- works just fine
     ...
     } catch (Exception e) {
String error = e.toString();
System.out.println(e.toString());

//remove the currently displayed "Please wait..." PopupScreen
synchronized (UiApplication.getEventLock()) {
UiApplication.getUiApplication().popScreen(
UiApplication.getUiApplication().getActiveScreen());
                }

//display a new screen with the error               UiApplication.getUiApplication().pushScreen( new WaitScreen(error));
}

An error is thrown in the last line "UiApplication.getUiApplication () .pushScreen (new WaitScreen (error));'. I know this because when the line is removed, the program works fine (except for the fact that the file is not downloaded).

When the URL does exist, there is no problem - the file is downloaded and the program does what I want it to do. So, the problem is when I try to view a popup that says details about the error.

Someone has any ideas why this might be the case?

Thank you!

UiApplication.getUiApplication().invokeLater(new Runnable()
   public void run() {

Status.show(error, 2000);
               }
});

Found a solution to my problem:

I was not correctly process the son.

Tags: BlackBerry Developers

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I moved

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CWIMAQRectangle RoiRectangle = new CWIMAQRectangle();

for my vision instead of having it in the method class, which is in the mainform class

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I think that suits him!

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Big assumption on what a Christian, thank you!

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AZZ says:

How can I display error messages from pl/sql calls on application pages?

Current situation:

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Hello everyone
I have a multi-threaded Java 7 (jar file) program that uses JDBC to perform work (he uses a fixed pool of threads).
The program works very well and it records things that it moves the console command shell window (System.out.printf ()) starting from multiple concurrent threads.
In addition to the release of the console, I also need to add the capability of this program write in a single flat ASCII text file journal - starting from multiple threads.
The output volume is low, the file will be relatively low because it is not a data file, a log file.
Can you please suggest a relatively simple and good to achieve design/approach using Java 7 features (I have not yet Java 8)?
The code examples would also be appreciated.
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I have a multi-threaded Java 7 (jar file) program that uses JDBC to perform work (he uses a fixed pool of threads).

The program works very well and it records things that it moves the console command shell window (System.out.printf ()) starting from multiple concurrent threads.

In addition to the release of the console, I also need to add the capability of this program write in a single flat ASCII text file journal - starting from multiple threads.

The output volume is low, the file will be relatively low because it is not a data file, a log file.

Can you please suggest a relatively simple and good to achieve design/approach using Java 7 features (I have not yet Java 8)?

The code examples would also be appreciated.

Use a dedicated thread for logging and a queue to source it. See the "queue implementations of the trails in the Java tutorials for the use of queues and the code example that works.

https://docs.Oracle.com/javase/tutorial/collections/implementations/queue.html

Java has several classes of queue synchronized you can use if those in this tutorial are not suitable for your use case. Here's just one:

https://docs.Oracle.com/javase/7/docs/API/Java/util/concurrent/ConcurrentLinkedQueue.html

Unlimited thread-safe queue based on linked nodes. This queue orders elements FIFO (first-in-first-out). The head of the queue is this element which remained the longest the queue. The tail of the queue is this element that has been on the queue as quickly as possible. New elements are inserted at the tail of the queue, and get the recovery operations of the queue of the elements at the head of the queue. At ConcurrentLinkedQueue is a good choice when the number of threads will share access to a common collection. Like most other concurrent collection implementations, this class does not allow the use of null elements.

Using a queue your current code can add recording which is FAST because it is add an instance of the class to a collection rather interact with the file system. And your current code requires NO knowledge of the functioning of the system of newspaper, that it connects or when and where it connects.

For your use case use you a synchronized queue and edit each of your worker threads to add their log data to the master queue used by the newspaper for the logging thread.

You shouldn't have multiple threads trying to write directly in the same file.

The entire point of the modular and multi-processing programming is to BREAK dependencies between modules of code.

The logging system must be INDEPENDENT of the other code and your current code must NOT have ANY need or knowledge of the file system or OF the specificity of the way where, or when the data is actually stored.

Your code must run simple and minimal logging by adding its data to a queud. Once the log data was added to the queue and then, as far as your code is concerned, that data has been noted. It should be ONLY module log to determine the LOCATION to save the data, HOW to record data and even WHAT information to log.

You can add the larger newspapers in the future: newspapers, paper 1) different levels of 2) to a remote server or the database 3 send some events in the log.

I suggest you create a SIMPLE D.O. (data object) to maintain the log info (attributes like gravity, time/date, type of exception stack, error, etc.). Then create a class of SIMPLE log with several overloaded methods: a method that takes a single parameter, with two, etc. Javas is owner of exception classes have some simple examples of both simple and complex, nested exception handling.

These methods journal would take care to fill in the NEWSPAPER to DO correctly and then placing the instance of the D.O. to the journal queue. In this way, you can use a parameter of a simple newspaper just pass an error message and the log class method will add a default severity level (which can vary from thread if you want), time (which can range from wire) and other necessary data.

The goal is to keep the journal interface use you in your existing code as SIMPLE as possible while keeping as independent as possible of the actual logging mechanism.

The result is a mechanism of simple logging that is versatile and scalable and can then be used for your PROJECTS that require a registration (file, database, e-mail).

Do not make the mistake to hardcode the mechinism journal in your existing code.

DO not continue independent, modular architecture that you already use.

TypeError: Error #1009 in different chassis

Hello. I know there are a lot of discussions on this subject, but so far I have not found the answer I was looking for.

I'm script in an Actionscript 3.0 file, not in the timeline itself.

I am creating a point and adventure where the player move through different scene by clicking on the environment as a normal point and then click adventure game. I currently have only 2 images.

I put the different scenes on different chassis where the Reader click the environment to move to this frame. However, when I put Morgoth movieclips and buttons in addEventListener on frame 2, I get:

TypeError: Error #1009: cannot access a property or method of a null object reference.

at Puzzle1copy()

I ran debug and got this:

Try to launch and connect to player using the URL D:\Users\kikilalaz\Desktop\New Sem\GameProjectStuff\Puzzle1Copy\Puzzle1copy.swf

[SWF] D:\Users\kikilalaz\Desktop\New Sem\GameProjectStuff\Puzzle1Copy\Puzzle1copy.swf - 1183598 bytes after decompression

TypeError: Error #1009: cannot access a property or method of a null object reference.

at Puzzle1copy() [D:\Users\kikilalaz\Desktop\New Sem\GameProjectStuff\Puzzle1Copy\Puzzle1copy.as:18]

I have read a lot of people, said the instance must be initiated first, until the eventlisteners can run, otherwise she will become zero.

Currently, I do not know how to fix this and is about to go crazy to try many different methods from different sources.

This is my code:

Header 1
package {} import flash.display. ; import flash.events. ; SerializableAttribute public class Puzzle1copy extends MovieClip { public void Puzzle1copy() {} Frame1 listeners btnTrashCan.addEventListener (MouseEvent.CLICK, TrashCom); btnRadiator.addEventListener (MouseEvent.CLICK, RadCom); btnRatHole.addEventListener (MouseEvent.CLICK, RatCom); mcVicMar.addEventListener (MouseEvent.CLICK, VicCom); mcWindow.addEventListener (MouseEvent.CLICK, WinCom); listeners frame2 mcDirt.addEventListener (MouseEvent.CLICK, DirtCom); btnBack.addEventListener (MouseEvent.CLICK, GoBack1); } frame1 functions function TrashCom(e:MouseEvent) {} txtCom1.text = "This is a trashcan."; } function RadCom(e:MouseEvent) {} txtCom1.text = 'This is an old radiator.'; } function RatCom(e:MouseEvent) {} txtCom1.text = "a rat hole. I can see rats inside. « ; }

Header 1

package {}

import flash.display. *;

import flash.events. *;

SerializableAttribute public class Puzzle1copy extends MovieClip

{

public void Puzzle1copy() {}

Frame1 listeners

btnTrashCan.addEventListener (MouseEvent.CLICK, TrashCom);

btnRadiator.addEventListener (MouseEvent.CLICK, RadCom);

btnRatHole.addEventListener (MouseEvent.CLICK, RatCom);

mcVicMar.addEventListener (MouseEvent.CLICK, VicCom);

mcWindow.addEventListener (MouseEvent.CLICK, WinCom);

listeners frame2

mcDirt.addEventListener (MouseEvent.CLICK, DirtCom);

btnBack.addEventListener (MouseEvent.CLICK, GoBack1);

}

frame1 functions

function TrashCom(e:MouseEvent) {}

txtCom1.text = "This is a trashcan.";

}

function RadCom(e:MouseEvent) {}

txtCom1.text = 'This is an old radiator.';

}

function RatCom(e:MouseEvent) {}

txtCom1.text = "a rat hole. I can see rats inside. « ;

}

function VicCom(e:MouseEvent) {}

txtCom1.text = "This must be where his body was found.";

}

function WinCom(e:MouseEvent) {}

txtCom1.text = 'He is too dirty to see anything.';

}

functions of frame2

function DirtCom(e:MouseEvent) {}

txtCom2.text = "nothing but garbage here.";

}

function GoBack1(e:MouseEvent) {}

gotoAndStop ("BackAlley");

}

Thank you very much for the help!

This is because the button is facing the second image and you cannot apply event for this button the first button.

You must wait until frame2 is rendered and for this button instance is put into service.

This code will be like