EJB / EE :: Long Running Task Processing In Java
Feb 18, 2014
I want to develop a Java EE application for the following scenario.
Webapp takes a file from a user and analyze the file. This analysis could take hours. User should be able to check if the analysis is finished via AJAX. When the analysis is finished user should be able to view the analysis report that has been generated by the analyzer.
I checked what are the possibles ways I could achieve this but couldn't get a clear idea. I heard about JMS, Work Manager API and servlet asynchronous processing. But still not sure what to use and how to use.I'm not very much familiar with EJB.
View Replies
ADVERTISEMENT
Apr 28, 2015
I have in my application a button that when it is pressed, runs a long running task (usually takes a couple of seconds....).
My problem is that while the task runs, I want to stop the button from receiving clicks. Unfortunately this is something I have not achieved.
I have tried creating a new thread and calling the long running method, and using the Display.geCurrent().asyncExec...
Examples of what I have tried so far:
myButton.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
if (myList.size() > 0) {
myButton.setEnabled(false);
myButton.setGrayed(true);
[Code] .....
In both cases, while the button is disabled and the cursor busy, if the user clicks the button, the long running method is ran several times - and this is what I want to avoid.
View Replies
View Related
Apr 16, 2014
Can we cance/stop a long running database query execution instantly so that we can do any another task.
As i know swing uses a single thread i,e Event Dispatch Thread (EDT), But at the same time we can use Swingworker class for better use of UI. When we use Swingworker class the process goes to a different thread and our basic UI is not Frozen. Infact we can do another task. But what I want is I want to stop of cancel the execution of swingworker thread ( Because I that thread takes long time to execute). How can I do that??
I used ProgressMonitor and in the cancel option i canceled the task ( worker.cancel(true) also i closed the connection and statement for executing the database query using stmt.close() and conn.close() methods.
But it does not work. How to cancel a long running database background process in a Java Swing Program.
View Replies
View Related
May 28, 2014
I have this code which suppose to sort files by their length and return a string[] of th file names:
import java.io.File;
import java.util.ArrayList;
public class SizeOrder extends SuperOrder {
public String[] sortArray(File[] pathList) {
File[] absoluteOrderFiles = this.absoluteSort(pathList);
ArrayList<File> sizeOrderList = new ArrayList<File>();
[code]...
Now, in the following line: absoluteOrderFiles[absoluteIndex].length() < sizeOrderList.get(sizeIndex).length()
I need to use the compareTo which only exists in Long object.
How do I convert primitive long to Long?
and is it possible to do it in a single line?
View Replies
View Related
Feb 22, 2015
I am new to Java , Every 5th date of every month , get 10$ in bank account .
View Replies
View Related
Dec 5, 2010
I want to create a TASK MANAGER for windows OS using java. Of course i am not expecting any code snippets, that is, what are the classes to be included and moreover HOW to do it.
View Replies
View Related
Apr 5, 2014
how to perform certain task on the shutdown of a web application in java
View Replies
View Related
Feb 27, 2014
I have written the java code using timer class to schedule the task , but i am getting error as } expected, i am not able to figure out the error, I have placed the { opening and closing curly bracket everywhere but still it is giving me error.
mport java.io.*;
import java.io.FileInputStream;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import javax.mail.internet.MimeMessage.*;
import javax.mail.internet.InternetAddress.*;
[Code] ....
View Replies
View Related
Jan 26, 2012
I'm relatively new to java and to image processing ... What I've done so far is make a simple application which opens the webcam and can take and save a picture. Ive then loaded the image pixel data into a 2d array. How then do I do what is known as 'fast fourier transform' on it from here?
View Replies
View Related
Feb 12, 2015
can we use java programming for image processing. if yes then how do we do it?
View Replies
View Related
May 9, 2014
It seems we have abandoned Dice/Die(s), and are now working on something completely foreign. I don't even have a code to start with because I haven't the faintest clue what is going on here (no notes given on this topic, as usual). We are given 4 half-written programs to work with.
The instructions are:
"Examine the FormLetterEntry abstract class, and create the two derived classesTextEntry and DataItemEntry. Be sure to implement all the abstract methods in each derived class."
This is the code we were given:
package homework5;
import java.util.Properties;
/**
* Abstract class representing the entries in a form letter.
**/
public abstract class FormLetterEntry {
/**
* Retrieve the template string for this entry
* @return the value of this entry in a template
**/
[code].....
I understand (and correct me if I am wrong) that a derived class is a class that is created from a base class via inheritance. What I don't see are any notes on how to write a derived class. I see some notes online on how to do so, but they don't fit with what he's written above. What he means by "Be sure to implement all the abstract methods in each derived class."
View Replies
View Related
May 3, 2014
How to implement elasticsearch in java to do text processing. I am currently working in Windows OS with eclipse Kepler.
View Replies
View Related
Mar 30, 2014
I have text file of this form:
0file:/home/lenovo/mallet/cleantweet/242874110.240622335890878130.1593492469451548700.130861040068201270.1129582267689684590.0868854788292128480.
0807757885763000940.078431372549019660.0604575163398692850.02926967888604717320.020389315146348393
1file:/home/lenovo/mallet/cleantweet
[Code] ....
Am i going in correct way?
View Replies
View Related
Jan 1, 2015
I have created an application using hibernate and struts.In which a form is created where the user will enter all its personal details(for e.g name ,phone no. and address).
Here for address I have used textarea and whenever user enters the address, sometimes it can be a long string also.
So the problem is if a long string is entered then while displaying that ,address comes on single line and the page is stretched.
how to break this single string into mutiple lines in java class?
View Replies
View Related
May 19, 2014
This is my program: RemoteXMLRead.java
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.apache.commons.io.filefilter.WildcardFileFilte r;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
[code]....
It is working fine when i run in Eclipse, but is giving error when i run in cmd.. What i need to do to over come this..
View Replies
View Related
Mar 30, 2014
I've been playing around with this for about an hour.
Java Code:
Runtime runTime = Runtime.getRuntime();
try {
Process process = runTime.exec("notepad");
} catch (IOException e) {
e.printStackTrace();
} mh_sh_highlight_all('java');
So that works. Notepad will open.
However, I'm trying to get other programs to open. Specifically, this program: C:Octave3.2.4_gcc-4.4.0inoctave-3.2.4.exe...However, using that in place of notepad doesn't work. I'm assuming that there is some sort of system variable that explains why simply typing "notepad" works? As if you type notepad into the run box, notepad will open. Soo does that snippet work by going through some sort of system variables?How would I go about opening other programs, such as the one I referenced above.
View Replies
View Related
Apr 24, 2014
import acm.util.* ;
import acm.program.*;
import java.awt.* ;
class Chap6_ex1 extends ConsoleProgram {
public void run() {
println("This program displays a randomly schosen card.");
int number = rgen.nextInt(1 ,13);
int suit = rgen.nextInt(1 ,4);
[Code] ....
I am running the this from a Linux command line , in the cmd first i use :
javac -classpath acm.jar Chap6_ex1.java
end then :
java -cp .:acm.jar Chap6_ex1
The output i m getting after second command is :
Exception in thread "main" acm.util.ErrorException: Cannot determine the main class.
at acm.program.Program.main(Program.java:1358)
I know the problem is from the RandomGenerator class in packet acm.util.* but i dont know how to fix the problem . Every other program has worked . What I am missing or how this whole issue of packet importing works when running a java file from cmd ?
View Replies
View Related
Nov 12, 2014
I have built a Java app that uses SQLite (sqlite-jdbc-3.8.7.jar). Running the jar file on windows works as expected however, trying to run it on Ubuntu Server 14.04 has turned into quite a task!
I put together a brand new machine in VirtualBox for testing. I installed Java (sudo apt-get install default-jre) and have installed SQLite (sudo apt-get install cl-sql-sqlite3 sqlitebrowser). I created a new sub-directory within my home directory and copied over the jar file. From terminal, I then run the command: sudo java -jar ProductionView.jar and I receive a java.lang.unsatisfiedlinkerror. For troubleshooting, within the app, before making a connection to the db, I have printed out the location of where the db is to be created and it is correct (see attached pic). Is there more that needs to be configured before I can run this app on Ubuntu? I have posted the relevant code below :
(AppDatabasePath() is what is printed in the image...).
public static String AppDatabasePath() {
return AppPath() + APP_NAME + ".db";
}
public static String AppDatabase() {
return "jdbc:sqlite:" + AppDatabasePath();
[Code] .....
View Replies
View Related
Apr 16, 2015
I have tried to get my dinky little program I wrote to be stored as an executable through Eclipse to no avail. It seems I have tried everything else as well, to no avail. I do not want it to go through command prompt, but rather have it be its own entity. As you can probably tell my knowledge of Java and coding is limited, but always willing to expand.
View Replies
View Related
Mar 27, 2014
I am just learning Java and I am have a problem running programs at the command line. I have the following code:
package java_help;
import java.io.IOException;
class help {
[Code].....
I can run this program in net beans were I originally wrote the program and it runs fine there. I also compile the program at the command line using javac but when I go to run this program I get a error message that it cant find main.
View Replies
View Related
Mar 10, 2014
i have windows 7. cmd.exe told me it couldn't recognize javac.i have a JDK installed though...
View Replies
View Related
Jan 25, 2014
I want to know is there any way to run java program without installing jdk.
I want to run my code on system which dnt have jdk installed on it. is it possible??
View Replies
View Related
Dec 17, 2011
My PC runs on Windows XP. When I try to run a java program (written using NetBeans) from the command prompt, the program opens in NotePad but does not run.This is what I have been typing at the command prompt:
C:javahellosrchelloHello.java
The above is the correct path to the Java file on my PC.how to run the program from the command prompt or perhaps link me to a tutorial that explains it?
View Replies
View Related
Jul 10, 2014
I'm trying to run a command line executable file using java but there is no output. On the task manager a conhost process opens when the application is run. I've tried
1)try {
Runtime.getRuntime().exec("D: est.exe");
} catch (Exception e) {
e.printStackTrace();
}
2)String[] cmd = { "D: est.exe"};
Process p = Runtime.getRuntime().exec(cmd);
p.waitFor();
and
3)//Runtime.getRuntime().exec("D: est.exe", null, new File("D:"));
same thing happens i.e. nothing happens.
View Replies
View Related
Jul 1, 2014
I have to store data I've pulled from the web i wanted to do this by storing it in a database but after looking at some tutorials i'm not sure if its possible as the databases don't seem to run with the application but instead run as an independent entity.if its possible to have a database in the java application so it runs when the application runs.
View Replies
View Related
Dec 9, 2014
I need to parallelize my java application in order to run it in a cluster with many nodes where is OpenMPI.
My code works like this:
In the First.jar (the code below) runs a for loop many times which executes another jar file (Second.jar) with different argument in every loop.
Java Code:
for (int i = 0; i < gameEnd; i++) {
Runtime.getRuntime().exec("java -jar Second.jar "+plrA+" "+plrB+" "+path+");
} mh_sh_highlight_all('java');
View Replies
View Related
