Java Parallelization For OpenMPI Cluster Running

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');

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Servlets :: How To Exchange Data In Different Nodes In Same Cluster

Jul 21, 2014

What is better and easier approach for exchanging data (in my case list of objects) between servlets in different nodes in same cluster? I thought about RMI or just direct url servlet call. But it seems that I'm missing something here.

My problem is the following:

I have to create some kind of diagnostic storage for each cluster member. It will collect all information and errors during application work.

And If I need to check application status I do web request and it will show me that these servers (cluster members) are okay and that node has an issue.

I'm using spring and tomcat.

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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..

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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.

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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 ?

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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] .....

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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.

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Mar 10, 2014

i have windows 7. cmd.exe told me it couldn't recognize javac.i have a JDK installed though...

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Jan 25, 2014

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Dec 17, 2011

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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?

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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.

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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.

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Jul 1, 2014

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Dec 1, 2014

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Sep 14, 2014

I am trying to create a program that allows me to enter 5 students numeric grade (0-100) to a letter grade (A, B, C, D, F) and I CANNOT use an array. When I try to run my program it says main class not found, and when I change the it from a string to a void in the main method it does not work.

Java Code:

import java.util.Scanner;
public class Week3ControlStatements2
{
public static String main(String[] args){
int numberGrade = 0;
int quotient = numberGrade / 10;
int remainder = numberGrade % 10;

[Code] ....

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Jun 18, 2014

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I downloaded this code from Head First Java. But when I tried running it on Eclipse, it gives this error message.

import javax.sound.midi.*;
public class MiniMiniMusicApp { // this is the first one
public static void main(String[] args) {
MiniMiniMusicApp mini = new MiniMiniMusicApp();
mini.play();

[code]....

and this was the error message: Jan 02, 2015 8:10:36 PM java.util.prefs.WindowsPreferences <init>Could not open/create prefs root node Software Java SoftPrefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.

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Swing/AWT/SWT :: Running Application Using Java 1.6 And Windows-based X Server

Apr 15, 2011

At our company we run a third-party Java-based GUI application on one of our Linux server machine, displaying the application to our local Windows work stations using the Cygwin X Server.We noticed a few problems with a new version of this application and was able to narrow it down to the following conditions:

1. Java Swing application running on a UNIX host;
2. Java used is 1.6 (problem not noticed when using Java 1.5)
3. Displaying to Cygwin X server (I've heard other windows-based X servers have the same issue, but I don't have access to any others at this time).

If we run the application natively on Windows, I'm told if the application runs on the Linux host and displays natively to that machine's display there are no problems (although I'm not able to verify this myself).The problems are:

1. Any new frame/dialog is opened in the geographic center of the dual displays, rather than in the middle of one or the other;
2. Any attempt to drag the window to a different location on the display seems to work, but as soon as you let go of the drag, the window snaps back to the original location. This only happens the first time you try to move each window.
3. Drop-down controls (JComboBox, for example) just close back up as soon as you click on them. If you click and drag the mouse to attempt to make a selection, no selection can be made.

Are these known problems using 1.6 on UNIX displaying to Windows-based X Servers?

The only real problem is number 3. I expect that if I put more work into the window placement, I should be able to get past number 1. Number 2 is just a minor annoyance.The following is a simple Java Swing application which when run in the correct environment will exhibit the problems.

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

[code]....

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Jul 17, 2014

I wrote some java applications on my computer, which is 32-bit Ubuntu 12.04 LTS. Could the application run on both 32-bit and 64-bit versions of linux? Or could it only run on 32-bit versions of linux?

System.out.println(System.getProperty("sun.arch.da ta.model")); // outputs 32

I would like to know if I run it on a 64-bit version of linux if it will take advantage of the performance advantages of 64 bits.

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Aug 24, 2014

I have an embedded browser in a standalone java app running on windows. The browser calls up web pages over the internet with no problem.

import org.eclipse.swt.browser.Browser;
final Browser browser = new Browser(group01, SWT.NONE);
browser.setBounds(0, 0, 1000, 400);
browser.setVisible(true);
browser.pack();
browser.setUrl(texturl.getText());

I have a C executable which captures and documents network traffic. I communicate with it by entering http://27.0.0.1:6500 into any browser (it works with them all). It responds with a simple html form (three buttons, a tick box, a label, and one text box).However I cannot get it to work with the embedded SWT browser.

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Jun 25, 2014

I get the following error when trying to run code.

java.lang.NullPointerException
at conntecttoDB8.SSHCommandExecutor.main(SSHCommandEx ecutor.java:26)

package conntecttoDB8;
import java.io.InputStream;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
 
[Code] ....

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Jul 14, 2014

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May 3, 2015

This is a program that prompts a menu using the do-while iteration. If user input is not valid, the menu should be reprompted once. But when I run the code and enter an invalid value, the menu is prompted 3 times.

class Menu {
public static void main(String args[])
throws java.io.IOException {
char choice;
do {

[code]....

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Jun 11, 2014

I just wrote a java program with eclipse that has to read many-many inputs from the user. I want to test it, but I really don't want to type it everytime again and again...

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Running A Class Outside The Directory

Feb 17, 2014

I have a directories in UNIX:

/home/t_bmf/Java/HelloWorld/src/helloworld :will contain a .java file
/home/t_bmf/Java/HelloWorld/bin :will contain all .class file

Let say a have a code:

package helloworld;
public class HelloWorld {
public static void main(String[] arg) {
System.out.println("Hello World");
}
}

a command to compile this even outside the directory /home/t_bmf/Java/HelloWorld/src/helloworld
javac -d /home/t_bmf/Java/HelloWorld/bin /home/t_bmf/Java/HelloWorld/src/helloworld/HelloWorld.java

This will generate a directory /home/t_bmf/Java/HelloWorld/bin/helloworld and file inside this is HelloWorld.class

To run this program I must be in directory /home/t_bmf/Java/HelloWorld/bin and using this command:

java helloworld.HelloWorld

Question:

I already how to run the HelloWorld.class, but I must be in helloworld /home/t_bmf/Java/HelloWorld/bin to run it. Is there's a way to run the class even when I am not in directory /home/t_bmf/Java/HelloWorld/bin? Let's say I'm in /home/t_bmf, can I still run the HelloWorld.class?

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