Can a java program run as a system process?

Hi,
I need to know if a java program can be run as a system process. I don't want it to be run as a user process. Is there any way at all?

Tomcat is such a program.
If you want to write a program that runs like a daemon (Unix) or a Windows service (Windows), use the Jakarta Daemon Framework (no, it is not an Indonesian devil) that was used to write Tomcat. Check http://jakarta.apache.org/commons/daemon/

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How to make a java program run as a background process.

</pre>
writing a client server application.
a program is supposed to run on a the client right from the time the client turns on the computer till the computer is turned off.
the catch is the client should all the time be unaware of the program running in his computer, no dos prompt window, no icon on the taskbar,etc. can i convert it the class file into an exe file through software and put the exe filename in autoexec.bat. But then i think that the dosprompt window will open up on starting, but the client should see nothing.
please help
</pre>

</pre>
Thanks Daniel and jesper,
could not really fully understand what you mean.
creating a batch file is okay, but do you configure it
to run in a an hidden mode.
Also I have no idea of how to make a window
service.can you please elaborate a bit
</pre>

Can a java program be run in the background?

Hi all,
Can a java program be run in the background without the user being aware of it? I need to make a program that continuosly monitors a pc at regular intervals and runs at all time. It should be hidden(shouldn't display on the screen while running) from the user, and also, can it be run as a system file so that even if a user checks he/she would think of it as a system file?

I'm the administrator of all the computers. Then as I said there are commercial applications that do that.
Presumably you expect a problem now. And implementing an acceptable solution is going to take you months. Because not only need to 'hide' the application, you also need to set up all the monitoring and logging capability. And the first will require quite a bit of JNI work along with testing (in particular as it could interfer with existing applications on the users computers.)
I need to
install the software in all the machines and i want
that the users who use the machine should not be able
to close the program through the task manager. If the users have admin rights then they can terminate a windows service.
And if they don't have admin rights then you can simply turn off the ability to install anything.
I want
to know what the resources of the computers are and
that if anyone has added a resource to it or
not(attaching a flash usb thumbdrive etc). Lots of JNI.

JavaService - can install java program into win2k service, but cannot run

i have a JavaService problem: i can install java program into win2k service, but cannot run
the version of javaservice is 2.0.7.0
the following is the message:
C:\DailyUpdate\dist>JavaService.exe -install DailyUpdate C:\Program Files\Java\j
dk1.5.0_05\jre\bin\client\jvm.dll -Djava.class.path=C:\DailyUpdate\dist\ftpbean.
jar;C:\DailyUpdate\dist\mysql-connector-java-3.0.10-stable-bin.jar;C:\DailyUpdat
e\dist\DailyUpdater.jar -Xms16M -Xmx64M -start DailyUpdateHandler -params C:\Dai
lyUpdate\dist -out C:\DailyUpdate\dist\logs\out.log -err C:\DailyUpdate\dist\lo
gs\err.log
The DailyUpdate automatic service was successfully installed
The DailyUpdate service is starting.
The DailyUpdate service could not be started.
The service did not report an error.
More help is available by typing NET HELPMSG 3534.

I might be doing some programming for my company soon
which will require a program to monitor a database
and whenever there is a change to certain fields, it
must copy certain fields into another database. When I see "whenever thiere is a change to certain fields" I tend to think "triggers" - but maybe this won't work for you 'cause of the "another database" part. And the fact that triggers are inherently evil.
[snip]
Is it possible to run a Java program as a windows
service? And if so then how would you go about it? I'd hit Google - there're a couple ways to do this.
[snip]
Also,...if I were to use one of those programs which
can make an .exe of a Java program, then do you still
require the JRE to be on the machine? It depends on how you did the conversion. If you compile to native then no, if you just wrap up a JRE then yes.
Why I ask is
that I occasionally get asked to do small development
projects for my company, but we are a microsoft
partner and therefore do all the development in C#
and the like. So I would like to just implement as
many things in Java as I can, just to show everyone
that Java can do exactly what C# can do. But its
difficult to convince people of this since I always
require the JRE and they dont. Of course, they require the .NET framework and you don't. And last I looked that thing was around 23 Meg.

Process name representation in a LINUX machine for a JAVA program running..

Hi,
We are using an Intel machine loaded with Red Hat Linux 7.2 OS to run JAVA programs. We have a requirement to calculate the CPU and MEMORY usage for each JAVA program running. Unfortunately when a java program is run say "java ESR" and we run a ps -ef | grep -i java, it is shown as hkumar 2847 2799 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2874 2847 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2875 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2876 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2877 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2878 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2879 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2880 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2881 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2882 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2883 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2884 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
hkumar 2885 2874 0 19:15 pts/3 00:00:00 /usr/java/jdk1.3.1_03/bin/i386/n
instead of the actual name of the program ie. ESR.
Does anybody know why this happens? Is there a way out to ensure that "ps -ef | grep java" gives the actual name of the java program being RUN?
Thanks in advance,
Harish

You have less chance to identify which programm that VM instance is running right now.
But you could (as we do) keep track of your programs if you save the process-id when you start the program.
We need this to shut down running java batch programs but you could find out the used system resources with this way as well...

How to execute unix command from the Java program running on Windows

Hello,
I need to
1. Execute a unix shell script from a Java program running on the Windows.
2. I also need to capture the output of this shell script in my program.
Please suggest me how to achieve this.
Thanks in Advance.

Hi...
Something is missing here
If you want to execute a shell script in windows that not posible unless you find or develop a unix shell script parser for windows.
But if you are trying the execute a unix shell script on a remote unix computer from your java program running on a windows platform you can do that by logging on to the UNIX terminal which is running on port 23 I think.
You can test this using telnet tool on windows
just type on command prompt
telnet <ip of the unix pc> <port number this case 23>
you should get the unix terminal. If that works you can do the same through java or you can directly conect to port 23 of that pc using sockets that way your program will be platform independant

Execute Unix command from Java program running on windows

Hello,
I need to write a java program that fetches file count in a particular unix machine directory. But java program will be running on windows machine.
The program should execute unix list command and fetch the output of that command.
Can anyone help me on this?
Thanks.

Hi there,
I had a similiar problem, though years ago. It was to have a java program execute any other. Lately, I've had to have a java program running on a unix machine execute a shell script. Entirely two different scenarios. I'm not sure what you will need for your app, but look into this:
Java Native Interface for executing C/C++ code.
C/C++ Code for launching the program you need to run.
java.lang.Runtime(?).exec(....)
With a combination of that stuff, you can make a launcher for any os that has Java running on it, and with Runtime, you can exec() pretty near any sort of unix shell or app command you'd like.
Good luck.
Tim

Can a macbook pro run windows operating system?

can a macbook pro run windows operating system like xp, vista or windows 7?

nathalie1985 wrote:
Is it best to run Windows 7 in Boot Camp, or would it be better to use VMWare Fusion or similar? I have a MacBook Pro Intel Core 2 Duo (OSX 10.6.8) and I also have a Dell laptop solely because one program that I need to use for work is only available for Windows. I would love to consolidate to my mac but am afraid installing Windows will ruin it!
It all depends on what your useage of Windows will be, for playing games install it in BootCamp, for word processing, spreadsheets, email. browsing etc a virtual Machne will be fine.

How i can call java program in VB2005 ?

Hi members...
Please...please...please...
If any one now how i can call java program in VB.net program and open it ,please i want now the way to do it by details and by examples and step step to do it ,,..
thanks ...

If your server does not return to the command prompt, write a java programm which starts your server and returns to the command prompt.
An example for an application like this:
import java.io.IOException;
public class StartApp
public static void main(String[] args)
if (args.length > 0)
StringBuffer cmd = new StringBuffer();
for (int index = 0; index < args.length; index++)
cmd.append(args[index] + " ");
try
Runtime.getRuntime().exec(cmd.toString());
catch (IOException ioe)
System.out.println("Error: command not found: " + cmd.toString());
else
System.out.println("Error: missing arguments");
An example for starting your server with that programm:
/usr/bin/java -jar ./StartApp.jar /usr/bin/java -jar ./myServer.jar
It works. Have fun.

Is there any way to check another Java program running status?

HI. I want to write a Java program on hand-set but my program seems needs lots of resources and if there is another Java program running on the same hand-set simultaneously, my program will slow down. So, I want to check if there is another Java program is running on the hand-set, my program will show a message to user reminding user to close another program first.
Is there any way to do so?

On most recent devices, the application is not terminated but paused by using phone functions, and can be reactivated from the aplication management software. The javax.microedition.midlet package documentation is quite specific, if a tad obscure, about the MIDlet lifecycle and the role of the MIDelt methods vis-a-vis the AMS.
{color:#0000ff}http://java.sun.com/javame/reference/apis/jsr037/javax/microedition/midlet/package-summary.html{color}
Parenthetically, I've never been able to figure out how resumeApp should be used, nor have I seen this method invoked in any of the samples that come with the WTK, but I haven't gone through all of them.
I believe the still-in-progress MIDP3 will make it possible to have MIDlets that share the screen with native apps and which can be minimized and restored.
db

Can two java program write to the same port by fetching data from different

can two java program write to the same port by fetching data from different ports, if yes is thing possible for a 3rd program to get all data (is there any data loss or collision)
how is this possible

can two java program write to the same port by fetching data from different portsTwo java clients can connect to the same server port and they can both write to it. However the server will see the connections as two separate accepted sockets.

My java program runs fine even if i don't specify access specifier of class

Hi,
My java program runs fine even if i don't specify access specifier of class as public .
Then why do they say that atleast one class should be specified as public.
please help.

public access specifier is the default access
specifier
so if you dont give the access specifier before the
class name it is not wrong.I think that you are wrong. The default specifier is package or "package-private".
See here:
http://java.sun.com/docs/books/tutorial/java/javaOO/accesscontrol.html
Message was edited by:
petes1234

Java Program in Different Operation Systems

Just one question? can I use a java program (.jar) compiled in windows, in my solaris only by copying the .jar , or do I need to compile it with the solaris SDK?
Thanks in advance for your help and sorry for my ignorance.
Javier

Hi,
It is not required to recompile bcoz the .jar file contains .class files which are independent of Operating system which will be taken care (interpreted) by JVM.
Actually there is different JVM's for different operating systems(Windows 98,Unix,OS/2). No need to have differend java class file for different operating system. Pls, remember Java is platform independent language.
Regards,
S.Prabu

Java program running as win32-service

Hi,
I am running Java programs as Win32-Services on a Windows-Cluster with Windows 2000 Service Pack 4. I have written a Wrapper program in C which runs as a Service and creates a JVM. Normally this works fine but now I have on one cluster the problem that I don't have any output in the Console of the Service. All the output which is written with System.out.println to the console just does not appear.
And if I read input from the console I get the following exception:
-E-2005-02-15 16:04:44.734: java.io.IOException: The handle is invalid
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:194)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:220)
at java.io.BufferedInputStream.read(BufferedInputStream.java:277)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:408)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:450)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:182)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
at at.co.systema.gf.util.ConsolePrompt$ConsoleTask.run(ConsolePrompt.java:98
Does anybody have experience with running java programs as Win32 services ?
Ingo

Your application needs to be able to run without System.in or System.out
There is no console for a service.
Replace System.out with a logger. If you need input you need to write a client which sends the commands to the service.

Make java program run on a scheduler

I have a java program that currently runs as a cron job at specific intervals. I want to run it at smaller intervals not allowed by cron, like every minute. I want it to wake up, check it's work load, process it, and then sleep for a minute...and do this over and over again. What code can I insert into my java program to accomplish this.

All you need is to have all of your Threads go back to sleep when there is no work to be done so that your application doesn't consume any resources while it doesn't have any work to do.
If you want your application to go back to sleep for one minute when it has emptied a JobQueue, all you need is to use Thread.sleep(60000); inside the piece of code which is looking for the work load.
Overall, this approach is much better than a cron job, since you could end up with concurrency issues with the cron job. Consider ending up with a workload which requires more than a minute to be processed... Before you can get it done, there's a new instance of your program which tries to get the same jobs done at the same time! You could get a lot of headaches with this :P
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Dalzhim

Can a java program run as a system process?

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