Executing external program

My java application has a feature in which it executes an external program, which creates a file, then shuts down. That's working great.
My problem: how can my program tell when the external program is finished executing, so that it can work with the created file?

Basically you just need to call waitFor on the Process object returned from Runtime.exec. See this article for a more detailed discussion: http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Similar Messages

Executing external programs from PL/SQL?

Hi All,
Is it possible to execute external
programs (i.e. shell scripts, or
perl scripts) from a stored procedure
or trigger?
I know that typically it is the other
way around, but hey try telling that
to my boss.
Thanks

you cant execute any operating system commands from plsql
procedures. but you can achieve result by using either java
stored procedure or pro*C program .
Suresh Vemulapalli

How to execute external program in java?

My question is how to execute an external program in java.
I need to call a unix command in java.
Thanks.

it depends on what you are trying to do. Following are the two methods
1. Runtime.exec() : this method allows you just to call an external program as a seperate process
2. JNI (Native Interface) :- As of right now only C and C++ are supported by this method. This method allows you to directly call the C/C++ methods from JAVA

Executing external programs in Windows from UNIX

Hi all,
I would like to call an external program in Windows box from UNIX box. I tried to create a command in SM69, specify the command and OS type to Windows. When I try to execute the command in SM49, I got an error 'program_start_error'.
I tried also to create an RFC destination in SM59, using connection type = T (start external program via TCP/IP), specifying the program in the Program field and specify the Windows box hostname (or IP add) in the Target host. But this also seemed could not work.
Is there any other ways I could do this?
Thank you.
Mizwan

RSBDCOS0 Execute UNIX commands. 
Look at SM69, SM49 and
Function SXPG_COMMAND_EXECUTE
e.g. SM69
Press F5 or click Change button
Press F6 or click Create
Fill in the following parameter :-
Command name - the unix scripts file name e.g. ZABAPFTP
Operating system command - e.g. sh
Parameters for operating system command - e.g. /sap_production/usr/sap/trans/data/zabapftp.sh
REPORT ZABAPFTP.
data : t_btcxpm like btcxpm occurs 0,
 p_addparam like sxpgcolist-parameters,
 rep_date like sy-datum,
 t_date like SXPGCOLIST-PARAMETERS.
rep_date = sy-datum - 1.
t_date = rep_date.
*p_addparam = '/sap_production/usr/sap/trans/data/zabapftp.sh'.
refresh t_btcxpm. clear t_btcxpm.
call function 'SXPG_CALL_SYSTEM'
 EXPORTING
 commandname = 'ZABAPFTP'
 additional_parameters = t_date
 TABLES
 exec_protocol = t_btcxpm
 EXCEPTIONS
 no_permission = 1
 command_not_found = 2
 parameters_too_long = 3
 security_risk = 4
 wrong_check_call_interface = 5
 program_start_error = 6
 program_termination_error = 7
 x_error = 8
 parameter_expected = 9
 too_many_parameters = 10
 illegal_command = 11
 others = 12.
if sy-subrc ne 0.
 write:/ 'Error in ZABAPFTP ', sy-subrc.
endif.
regards
vinod

Pocket PC -Problem executing external program from java

Hi,
I'm developing an application on Dell Axim x51 PDA. I am using mysaifu jvm. The application needs to execute an external program (.exe) for which I'm using the Runtime class.
I get java.io.IOException: The system cannot find the file specified.
I have verified that the file exists. ( i used File class to check if the file exists)
here's the part of code :
Runtime rt = Runtime.getRuntime ();
File sktScan = new File("\\My Documents\\RFID\\ScktScan.exe");
if(sktScan.exists())
System.out.println("FILE EXISTS");
String command = sktScan.getAbsolutePath();
process = rt.exec (command);
System.out.println("Socket Scan Path is : "+command);

You have acces to "java.lang.Runtime currentRuntime.exec()" method ? in my case NetBeans IDE dont give me for my compilation with :
          microedition.configuration     CLDC-1.1
          microedition.profiles     MIDP-2.0

JavaProcessBuilder freeze to execute external program

I am trying to run external program using JavaProcessBuilder class. This program doesn't return any status ( it freeze here: int status = mosesPro.waitFor();) when there are more than 20 lines in my test file (command [3, 4]). I would be very thankful for any solution/suggestion. I have attached my sample code below:
String command [] = new String [5];
command [0] = "/Users/X/tools/moses/moses-cmd/src/moses";
command [1] = "-config";
command [2] = "/Users/X/Documents/thesis/workspace/juneTest/translation/evaluation/filtered.test/moses.ini";
command [3] = "-input-file";
command [4] = "/Users/X/Desktop/test2.input";
try {
child = new ProcessBuilder(command);
mosesPro = child.start();
int status = mosesPro.waitFor();
if (status == 0) {
BufferedReader reader = new BufferedReader(new InputStreamReader(mosesPro.getInputStream(), "UTF-8"));
String line;
line = reader.readLine();
while (line != null) {
System.out.println(line);
line = reader.readLine();
reader.close();
} else {
BufferedReader errorReader = new BufferedReader(new InputStreamReader(mosesPro.getErrorStream(), "UTF-8"));
String errLine;
errLine = errorReader.readLine();
while (errLine != null) {
System.out.println(errLine);
errLine = errorReader.readLine();
errorReader.close();
mosesPro.destroy();
} catch(Exception ex) {
ex.printStackTrace();
}

You have a deadlock. The stdout buffer is filling so the process is waiting for space to become available. Space can never become available since you don't read the stdout stream until the process has terminated. You should read the 4 sections of http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html and implement the recommendations.
Note - the 'traps' article is concerned with Runtime.exec() but the traps are just the same with ProcessBuilder.

Executing external program (non-java)

Hello,
I just started programming Java. I installed SunForum3.2 on SunRay some days ago and I was faced with the problem that all that the people who are registered with the GateKeeper-Software are not shown anywhere. So I developed a small app, that read out a file containing the output of the command "registrar -q" ( displays all registered users including their SunForum-name ). Now some people not working on the SunRay-platform would like to connect as well to the SunForum-users. For this reason I'd like to execute "registrar -q" periodically and directly use the output from and within a Java-app but I couldn't find a way to execute the program "registrar -q" so far.
Thanks for your help.
Thomas

Process p = Runtime.getRuntime().exec( "registrar -q" );
Then read the Process's input stream, which should give you the stdout of your command. There are plenty of full code examples of how to do this floating about, and you should have no problem with it.

Execute external program from java in the same virtual machine

hello,
I need some help. here is what i need: i'm developing a test tool and i need to execute the application to be tested from my test tool in the same virtual machine so that i can be able to connect to that application and catch events like clicking and so on.
problem is that i do not know how to launch the application i want to test in the same virtual machine as the test tool.
any help would be good,
thanks

problem is that i do not know how to launch the
application i want to test in the same virtual
machine as the test tool.Just invoke the main class of that application.
You probably don't want to hear this, but writing a test tool is not easy if you are going to try to catch events etc. It's probably a bit too hard for you if you don't know how to invoke an app within the same VM.
Kaj

Execute external program, ErrorStream and InputStream

I use this command to launch new process:
Process proc = Runtime.getRuntime().exec(cmd);
as stated in java doc
The methods that create processes may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. The created subprocess does not have its own terminal or console. All its standard io (i.e. stdin, stdout, stderr) operations will be redirected to the parent process through three streams (getOutputStream(), getInputStream(), getErrorStream()). The parent process uses these streams to feed input to and get output from the subprocess. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.
but I do not need any those streams. what happen if I make proc = null;
will there be any potential block or deadlock?

I have read this article before.
there is usage of waitFor() in example but I do not want to use waitFor().
I want to launch many processes and monitor them by some other way... for example via sockets...
right now I launch my process via shell script and redirect STDOUT and STDERR to /dev/null
is it possible to launch it from java the same way?
Edited by: NoName on Jan 27, 2009 4:16 AM

How can I execute an external program from within a button's event handler?

I am using Tomcat ApacheTomcat 6.0.16 with Netbeans 6.1 (with the latest JDK/J2EE)
I need to execute external programs from an event handler for a button on a JSF page (the program is compiled, and extremely fast compared both to plain java and especially stored procedures written in SQL).
I tried what I'd do in a standalone program (as shown in the appended code), but it didn't work. Instead I received text saying the program couldn't be found. This error message comes even if I try the Windows command "dir". I thought with 'dir' I'd at least get the contents of the current working directory. :-(
I can probably get by with cgi on Apache's httpd server (or, I understand tomcat supports cgi, but I have yet to get that to work either), but whatever I do I need to be able to do it from within the button's event handler. And if I resort to cgi, I must be able to maintain session jumping from one server to the other and back.
So, then, how can I do this?
Thanks
Ted
NB: The programs that I need to run do NOT take input from the user. Rather, my code in the web application processes user selections from selection controls, and a couple field controls, sanitizes the inoputs and places clean, safe data in a MySQL database, and then the external program I need to run gets safe data from the database, does some heavy duty number crunching, and puts the output data into the database. They are well insulated from mischeif.
NB: In the following array_function_test.pl was placed in the same folder as the web application's jsp pages, (and I'd tried WEB-INF - with the same result), and I DID see the file in the application's war file.
        try {
            java.lang.ProcessBuilder pn = new java.lang.ProcessBuilder("array_function_test.pl");
            //pn.directory(new java.io.File("K:\\work"));
            java.lang.Process pr = pn.start();
            java.io.BufferedInputStream bis = (java.io.BufferedInputStream)pr.getInputStream();
            String tmp = new String("");
            byte b[] = new byte[1000];
            int i = 0;
            while (i != -1) {
                bis.read(b);
                tmp += new String(b);
            getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + tmp);
        } catch (java.io.IOException ex) {
            getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + ex.getMessage());
        }

Hi Fonsi!
One way to execute an external program is to use the System Exec.vi. You find it in the functions pallet under Communication.
/Thomas

Re: Error while Execute External Operating System Command using T.code SM49

Dear Experts,
I Have uploaded one .exe file in the application server (eg: sum.exe) and created the OS command in SM69 transaction .
And maintained the application server path in the 'operating system command' field in SM69 t.code.
Our SAP system, oprating system is UNIX.
After I have executed the external command using transaction SM49 , but I got the below error.
Can not execute external program (permission denied) , External program terminated with exit code 1
Immediately I run the SU53 transaction code to check the authorization, but Authorization was successful.
Could any one please help on this error.
Thanks in advance.

>>Can not execute external program (permission denied) , External program terminated with exit code 1
You need to give the permission as 755 to your file.
>>I Have uploaded one .exe file in the application server (eg: sum.exe)
You are on UNIX and do not expect to any result of .exe file as UNIX doesn't know about this.

AIR 2.6: Run external programs sequential (1 by 1)?

Hi,
I managed to run an external program in Adobe AIR (2.6). I'm using the NativeProcess for this. I would like to perform the following actions.
Pseudo-code:
execute program.exe
this will return a port number
set the port number as an environment variable (in windows)
execute program.exe with several queries
stop progam.exe
The corresponding executables:
C:\my_proj\program.exe start
var portnumber:String = process.standardOutput.readUTFBytes(process.standardOutput.bytesAvailable);
C:\WINDOWS\system32\cmd /c set port=portnumber
C:\my_proj\program.exe query test1
C:\my_proj\program.exe query test2
C:\my_proj\program.exe stop
My problem is the bold text in my source code underneath. I'm trying to wait till the first native process is finished and had returned its output. Once I have this output (=the portnumber) I can continue with the following action. And this is needed for all steps ... to execute them one by one.
But "do {} while (process.running);" is not working. My AIR applications is getting stuck in this loop ... as if process.running is always true.
Any idea how I can execute external programs sequential?
This is my source code:
 var file:File = File.applicationDirectory;
 file = file.resolvePath("NativeApps");
 if (Capabilities.os.toLowerCase().indexOf("win") > -1)
 file = file.resolvePath("C:\\my_proj\\program.exe");
 var nativeProcessStartupInfo:NativeProcessStartupInfo = new NativeProcessStartupInfo();
 nativeProcessStartupInfo.executable = file;
 var processArgs:Vector.<String> = new Vector.<String>();
 processArgs[0] = "start";
 nativeProcessStartupInfo.arguments = processArgs;
 nativeProcessStartupInfo.workingDirectory = File.documentsDirectory;
 var process:NativeProcess = new NativeProcess();
 process.addEventListener(ProgressEvent.STANDARD_OUTPUT_DATA, onOutputData);
 process.addEventListener(ProgressEvent.STANDARD_ERROR_DATA, onErrorData);
 process.addEventListener(NativeProcessExitEvent.EXIT, onExit);
 process.addEventListener(IOErrorEvent.STANDARD_OUTPUT_IO_ERROR, onIOError);
 process.addEventListener(IOErrorEvent.STANDARD_ERROR_IO_ERROR, onIOError);
 process.start(nativeProcessStartupInfo);
 do {} while (process.running);
 file = file.resolvePath("NativeApps");
 file = file.resolvePath("C:\\WINDOWS\system32\\cmd");
 var nativeProcessStartupInfo2:NativeProcessStartupInfo = new NativeProcessStartupInfo();
 nativeProcessStartupInfo2.executable = file;
 processArgs[0] = "/c";
 processArgs[1] = "set";
 processArgs[2] = "port="+portnumber;
public function onOutputData(event:ProgressEvent):void
 var process:NativeProcess = event.target as NativeProcess;
 var portnumber:String = process.standardOutput.readUTFBytes(process.standardOutput.bytesAvailable);
public function onExit(event:NativeProcessExitEvent):void
 process.exit();

Hello,
The "do {} while (process.running);" may take almost all of the resource, so other code was blocked, then the program seems no response.
You can add the following code in the onOutputData, like:
public function onOutputData(event:ProgressEvent):void
 var process:NativeProcess = event.target as NativeProcess;
 var portnumber:String = process.standardOutput.readUTFBytes(process.standardOutput.bytesAvail able);
 file = file.resolvePath("NativeApps");
 file = file.resolvePath("C:\\WINDOWS\system32\\cmd");
 var nativeProcessStartupInfo2:NativeProcessStartupInfo = new NativeProcessStartupInfo();
 nativeProcessStartupInfo2.executable = file;
 processArgs[0] = "/c";
 processArgs[1] = "set";
 processArgs[2] = "port="+portnumber;

LC 2 Error 1003 when executing external command brconnect on (xpgid=0,con

Dear all,
I am getting error in sm21.Please suggest .
Details Page 2 Line 23 System Log: Local Analysis of clusa 1
Time Type Nr Clt User TCode Grp N Text
10:00:32 DIA 000 600 DDIC LC 2 Error 1003 when executing external command brconnect on (xpgid=0,convid=.)
Error 1003 when executing external command brconnect on (xpgid=0,convid=.)
Details
Recording at local and central time........................ 10.05.2010 10:00:32
Task...... Process User...... Terminal Session TCode Program Cl Problem cl Package
06952 Dialog work process No. 000 DDIC 1 SAPMSSY1 S Operation Trace SBTC
No documentation for syslog message LC 2 exists
Parameter
1 .... xpgid=0,convid=.
Technical details
File Offset RecFm System log Grp N variable message data
224 260640 LC 2 brconnect & &Error 1003 & & &
Regards,
Kumar

Dear Juan,
Please find the logs.Please suggest.
dev_cp log
Trace file of control program (trace level 3)
< Function: BtcTrcInit> Function: main SAPXPG 720
2010-05-10--09-33-29 : Before BtcXpgDetach
> Function: BtcXpgDetach < Function: BtcXpgDetach Accept RFC connection from R/3 system
2010-05-10--09-33-29 : Before RfcAccept
2010-05-10--09-33-29 : RfcAccept returned OK
Begin of check_if_security_list
security check switched OFF
End of check_if_security_list
Begin of check_trace_option
End of check_trace_option
Install RFC call SAPXPG_START_XPG
Install RFC call SAPXPG_START_XPG_LONG
Install RFC call SAPXPG_END_XPG
Wait for RFC call SAPXPG_START_XPG or SAPXPG_START_XPG_LONG
2010-05-10--09-33-29 : Before first call of RFCDispatch
Security: rfcexec_logon_check
rfcexec_logon_check: logon_user =
sapxpg_logon_check: rfc_attr.user = BASIS
rfcexec_logon_check: client =
> Function: BtcXpgStartXpgLong
2010-05-10--09-33-29 : Beginning of BtcXpgStartXpgLong
 > Function: BtcXpgStartXpgImportLong > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgTable < Function: BtcXpgTable < Function: BtcXpgStartXpgImportLong
BtcXpgStartXpgLong: special_trace_flag = <6>
 > Function: BtcXpgStartXpgInt > Function: BtcXpgItTransfer Content of source log table:
 Line Text
 <No StdOut/StdErr output reported>
 Target log table is not identical to source
 ItGetLine terminated with NULL
 < Function: BtcXpgItTransfer > Function: BtcTrcReset < Function: BtcTrcReset Call mode: VIA RFC
 Input arguments of BtcXpgStartXpg:
 External program: brtools
 tracecntl = : 6
 Display of Parameter string switched off !!
 Contents of control flags:
 StdIn control flag: redirect StdIn
 StdOut control flag: store StdOut output in memory
 StdErr control flag: store StdErr output in memory
 Trace control flag: unknown contents
 Termination control flag: control program will wait for termination
 > Function: BtcXpgCheck > Function: BtcXpgArgv
 parameter number 1:
 parameter number 2:
 parameter number 3:
 parameter number 4:
 parameter number 5:
 parameter number 6:
 parameter number 7:
 Total number of arguments scanned: 7
 Argument argv[0]: brtools
 < Function: BtcXpgArgv < Function: BtcXpgCheck > Function: BtcXpgSigInst < Function: BtcXpgSigInst > Function: BtcXpgStart Rearrange stderr to be collected in memory
 Rearrange stdout to be collected in memory
 Redirect stdin, read from NUL:
 > Function: BtcTrcInit< Function: BtcXpgStartStart status of external program: external program successfully started
Id of external process: 0000005296
StdOut/StdErr collected in memory
Line Text
<No StdOut/StdErr output reported>
< Function: BtcXpgStartXpgInt> Function: BtcXpgStartXpgExport > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam< Function: BtcXpgStartXpgExport
2010-05-10--09-33-29 : End of BtcXpgStartXpgLong
< Function: BtcXpgStartXpgLong
2010-05-10--09-33-29 : After first call of RFCDispatch
Wait for RFC call SAPXPG_END_XPG
2010-05-10--09-33-29 : Before second call of RFCDispatch
Security: rfcexec_logon_check
rfcexec_logon_check: logon_user =
sapxpg_logon_check: rfc_attr.user = BASIS
rfcexec_logon_check: client =
> Function: BtcXpgEndXpg
2010-05-10--09-33-29 : Beginning of BtcXpgEndXpg
> Function: BtcXpgStartXpgExport > Function: BtcXpgTable < Function: BtcXpgTable < Function: BtcXpgEndXpgImport > Function: BtcXpgEndXpgInt > Function: BtcXpgItTransfer Content of source log table:
 Line Text
 <No StdOut/StdErr output reported>
 Target log table is not identical to source
 ItGetLine terminated with NULL
 < Function: BtcXpgItTransfer > Function: BtcXpgReadChild Output of external command not written to log !!
 Process executing external program has terminated
 < Function: BtcXpgReadChild > Function: BtcXpgEnd < Function: BtcXpgEnd Termination status of external program: no errors reported
 StdOut/StdErr collected in memory
< Function: BtcXpgEndXpgInt > Function: BtcXpgEndXpgExport > Function: BtcXpgParam < Function: BtcXpgParam > Function: BtcXpgParam < Function: BtcXpgParam < Function: BtcXpgEndXpgExport
2010-05-10--09-33-30 : End of BtcXpgEndXpg
< Function: BtcXpgEndXpg
2010-05-10--09-33-30 : After second call of RFCDispatch
2010-05-10--09-33-30 : After call of RfcClose (wait)
< Function: main
2010-05-10--09-33-30 : End of SAPXPG: main
dev_xpg
Trace file of External Program (trace level 3)
< Function: BtcTrcInit> Function: BtcXpgStart External program: brtools -sid prd -F printout alert_log 20100401000000 0128
Regards,
Kumar

How can an add-on like Firesheep access and execute an external program like Winpcap? Is that a security flaw in Firefox?

I have been reading about the Firesheep add-on that allows the user to hijack sessions of users on the network by stealing the cookie. I understand that to prevent any application from stealing the cookie, the cookie should not be passed by the site without SSL. However, my understanding of how Firesheep works is that it interfaces with Winpcap (a network sniffer). So my question is "How can an add-on execute an external program or operating system command like Winpcap?" Can any add-on do this and should I be extremely afraid of downloading any add-on because of the potential that it could have complete access to my system?

Hi Scott-L.
You asked a very good question and it turns out you're right.
However, one must be aware that download an Addon on another website that Mozilla may be dangerous. Indeed, the Addons found on the Addon Center are checked (roughly).
In addition, Firefox includes a blacklist that blocks addons identified as malicious.
More information here: [http://www.computerworld.com/s/article/9193420/Mozilla_No_kill_switch_for_Firesheep_add_on?taxonomyId=17&pageNumber=1]

How Can I execute an external program from my vi?

Hi guys,
I want to execute a external program to use it when i called with a bottom. I want push a bottom and execute the program, like acess direct icon or so.
Any help?.

Hi Fonsi!
One way to execute an external program is to use the System Exec.vi. You find it in the functions pallet under Communication.
/Thomas

Executing external program

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