I have developed a MPI application using Java and MPJ Expresss. It works perfectly in the multi-core configuration.
Recently, it was given to my access to the distributed memory environment in order to test my application. First, I did the MPJ HelloWorld application to check that the cluster configuration was working well. After that, I proceeded to run my application, but it freezes after showing:
MPJ Express (0.38) is started in the cluster configuration
To make things worse, I killed the process with Ctrl+C and I couldn't run the HelloWorld application. I had to kill the MPJ daemon in all machines and start them again.
I even replace the content of my main class with the same content of the HelloWorld class to see if it printed something. It didn't. Also, I created a HelloWorld application with a similar package structure to my application and the HelloWorld worked great.
One of the big differences I can notice between the HelloWorld and my application is that I have a set of libraries which size is around 29.8 MB, so I tried not adding the libraries to the execution class path. It worked, but of course, my application is useless because it can't find its required libraries at run time.
I would appreciate any comments and advices.
Thanks!
Visit mpj-express.org/readme.html and select a file based on your platform:
Linux / UNIX / Mac - http://mpj-express.org/docs/readme/README
Windows - http://mpj-express.org/docs/readme/README-win.txt
The (Windows) service "MPJ Daemon" should be installed once.
Nevertheless, threads are to be started before and halted after every MPJ application,
if you are using Eclipse IDE.
Note: On command line, you can start threads, run as many programs as you wish and finally terminate them.
Write 'machine' file
Start daemons: mpjboot machines
Compile: javac -cp .:$MPJ_HOME/lib/mpj.jar HelloWorld.java
Execute: mpjrun.sh -np 4 -dev niodev HelloWorld
Stop daemons: mpjhalt machines
Related
I want to make a Java Application that will start automatically when I start the computer and will run instead of the desktop, so the desktop-terminal etc will be unreachable for users. The users must use nothing but the application and when they close the application, the computer also must be turned off automatically. How can I do such a thing for a simple Java Application (jar)?
Shortly, for ubuntu you have to:
Remove desktop environment, just look around for some guides, it depends by which desktop you have (GNOME, XFCE, KDE, etc). https://askubuntu.com/a/147870
Add a script in /etc/rc.d and link it in rcS.d https://unix.stackexchange.com/a/83752.The script have to run your application, wait for end and shutdown,
an example could be:
#!/bin/bash
nohup java -jar MyApp.jar &
wait
/sbin/shutdown -r now
Try this in a virtual machine that you can reach in SSH or in some other ways, after you removed desktop environment, you cannot open a terminal.
I got stuck in the steps to deploy the play-java application to standalone server. I am using Ubuntu instance running onEc2 machine. After reading the official documentation I followed these steps:
Install typesafe activator to $Home/activator
Copy my project folder to $Home/activator/projects using Jenkins
Run cd $Home/activator/projects/project
Run dist command. It generate the project sh file
Run cd $HOME/activator/projects/sample/target/universal. It shows me three things i.e. sample-1.0.zip , tmp.
Run unzip sample-1.0.zip
Run cd $Home/activator/sample/target/universal/sample-1.0/bin. It shows me two scripts i.e. sample (for mac and linux) and smaple.bat (for windows).
Now, I tried to run this command as documentation says: sample-1.0/bin/sample -Dplay.crypto.secret="abcdefghijk" but it got stuck and shows nothing except a prompt on terminal.
What next steps are required to run the application in daemon mode. So that server will continue to run always?
Another question is why do I need to follow these steps because just after copying the project I can easily run activator run command to sample folder to run the server.
EDIT-1
Now I am getting Error: Could not find or load main class play.core.server.ProdServerStart while running sample -Dplay.crypto.secret="abcdefghijk" command
Play Framework modes
Play like other frameworks can run in different modes because we are usually like to run our program in different situation and these situations need their configuration. Production is one of play modes. In this mode as the name suggested we are ready to deploy our application where user can use.As a result requirements are different.
Some common configuration in Production mode :
We are confining https
Using production data base not testing one
Play doesn't show errors
Play framework run as long term process and if you are log out of your server your application will run
If your app fails Play will clone another application and run that so your app run forever except you turn it off.
and so on (it is based on your Production config file)
Your answer :
If you just want to test your app in remote server and see what happened, it's okay to use activator run this command runes Play app in development mode and application will killed if you exit or log off (error will shows up and so on). But if you want to use your app for Production it is necessary to run all of these steps.
I have a requirement where I need to develop application that reads TCP/IP Socket. I successfully made the program as Java program with No GUI means as soon as program runs it starts listening to the Socket and gets the response with the help of Netbeans IDE. Now as per my requirement i have to start execution of this program as soon as Linux system Booted.
Actually I am very novice in Java and Linux Platform, so have few doubts..
Is my Socket Program with no GUI is fine to be run as per my requirement.
How can I write script to run jar on Linux Boot up, I got to know. init.d is meant for this.
Ideally you should create a service wrapper for your java application and then make this service run on startup example here.
Use
sudo update-rc.d mytestserv defaults to run your service wrapper on startup on Ubuntu
So two things you'll need to do:
First create a small shell script to start your java program from a terminal. As you have packaged as a jar have a look at this, specifically the JAR Files as Applications section.
This may be sufficient: (although you'll want to use the full path to Java)
#!/bin/bash
java -jar path_to_jar_file
You should be able to run your script and successfully start your program.
Once you've got it starting from a script you can use standard linux tools to start the script. Either putting it in /etc/rc.local, or as you're using Ubuntu, use update-rc.d to start it on boot. See here for a very simple example of using update-rc.d
Hope this helps,
Will
Have you had experience with running a jar file using a command line, wrapped in a Windows service?
I'm trying to find a way to run a jar file without being logged into the machine, and since it allows command shell, I was wondering if it's a good idea.
Thanks!
Original Post:
I'm trying to run Associated Press's Web Feeds Manager, which is basically a jar file that can be run when logged in by double clicking it.
I'd like to run the same file but without being logged in to the machine. In their manual (http://wfm.ap.org/admin/content/help/Running_Agent_on_a_Remote_Server.htm) they write how to do that, using a commandline parameter.
Basically I'd like the jar to run as a Windows service, regardless of who's logged in, but Googling it showed it was problematic.
Have you had experience with remotely running jar files? What are the pitfalls?
Thanks!
On a google search, I came across this article -
Running Jar Applications as a Windows Service
It mentions about open source Java Service Wrapper project from Tanukisoftware.org for accomplishing this task.
Note: I've not used this personally.
If you are not interested in having the service started/stopped at boot/shutdown, but you just want the program to be started manually and keep running after logout, here is what you do:
$ nohup java -jar foobar.jar > foobar.log 2>&1 &
which means: start my foobar.jar (java -jar) and keep it running after I logout (nohup) redirect stdout to foobar.log (>) and also the stderr (2>&1), and make it running in background (& at the end).
Instead, if you are interested in installing a "service" in your linux box, there are many options, depending on what distribution you are using.
The most common are upstart (for ubuntu) and System V init scripts (Redhat or others). Also cron can be used to start/stop services at startup/shutdown.
You can find an example of installing a java app (hudson) on an init system here, or doing the same thing with upstart. Or, as I said, cron could be an option.
On Windows, there is Java Service Wrapper. And not much more.
For windows Java Service Wrapper is a better choice
My favourite is the upstart on linux, but it is Ubuntu only.
On Windows I see many alternatives according to this forum.
How do I run a Java .jar file as a Windows service on a Windows 2008 server? I have a jar file called SomeJavaFile.jar located under the C:\SomeDirectory directory on a Windows Server 2008 box. I usually just run this jar manually in the command line with: java –cp SomeJavaFile.jar com.ctg.SomeJavaFile and I let it run 24/7.
The problem with our Windows Server is if it restarts I need to run it as a service so it will automatically start as a service upon startup, because our processing for Vistakon runs 24/7. I have Googled around and tried to use a service wrapper and the sc.exe command to create the service.
I put the wrapper service.exe in the C:\SomeDirectory\. I use the following command to create it: sc.exe SomeJavaService binPath= “C:\SomeDirectory\service.exe \”java –jar C:\SomeDirectory\SomeJavaFile.jar\”” type= own start= auto error= ignore. This creates the SomeJavaService service correctly but when I try to start it I get an error that says the service on Local Computer started then stopped.
Some services stop automatically if they are not in use by other services or programs. Do I need to alter my sc.exe command to have the exact previous working command line maybe, by adding in the com.ctg.SomeJavaFile? So should I change This jar should just run in the background and constantly poll/ping the C:/poll directory then if there is data present it processes the data and sends an export file to another directory.
I have used this same .jar file for years successfully and it hasn't changed, but I cannot get it to run as a Windows service. This is the site I use to get the service wrapper http://code.google.com/p/simple-service-wrapper/. Any help would be greatly appreciated!
"winsw" is the standalone version of the Windows Service installer shipping with the Glassfish Java EE reference implementation.
Works well, but is not a fully polished product - I have used it for exactly this purpose for a couple of years. Requires .NET in some recent version on the Windows machine.
https://github.com/kohsuke/winsw
I think that the best bet would be wrap your java app with Procrun of Apache Commons Daemon .
Procrun is a set of applications that allow Windows users to wrap
(mostly) Java applications (e.g. Tomcat) as a Windows service.
The service can be set to automatically start when the machine boots
and will continue to run with no user logged onto the machine.
As per my analysis,
The Idle Solution will be writing a VC++ (.net) Windows Service creation program to launch the .bat (that triggers the jar file)/.exe as a System service with all the required call back methods to SCM.
Note : 1. Wrapping the process with sc.exe / srvany.exe would not work as it does not have any call back process to the SCM (Service Control Manager). 2. And java service Wrapper is a third party API (many are LGPL licensed).
If you start your Java code from commandline by using java -j some.jar does it run until you terminate the program, or does it stop by itself?
There needs to be a NON-Deamon Thread, that is running all the time. A JVM will terminate, if there is no thread running, that is not flagged as daemon.
If you have a little budget, buy an installer tool. I use instll4j. With that tool, you can create service launcher and install them during instllation.
The following solution is working fine for me having OpenFire Connection Manager (which is a jar file) running as service on Windows Server.
Download and install the Non-Sucking Service Manager
I didn't use the batch made by OpenFire team, because it didn't work for me (dependencies not found error...) So, make a batch file with the following code :
#ECHO OFF
cd /D "E:\connection_manager\lib"
java -jar startup.jar
and save it as cm_startup.bat in the bin folder of connection manager.
After that you can create the service with NSSM.
So, open a cmd.exe and run the following command :
nssm install ConnManager "E:\connection_manager\lib\cm_startup.bat"
.
Doc & examples
More documentation and examples for the Non-Sucking Service Manager here : https://nssm.cc/usage Actually NSSM as a lot of options available.
Here is a more complexe example :
nssm install solr "%JavaExe%" -Dsolr.solr.home="\"%CD%\solr"\"
-Djetty.home="\"%CD%"\" -Djetty.logs="\"%CD%\logs"\" -cp
"\"%CD%\lib\*.jar"\";"\"%CD%\start.jar"\" -jar "\"%CD%\start.jar"\"