Executing a Perl program from within a Java prog

How do I execute a Perl program from within a Java program.
Lets say that the Perl program that I want to execute is 'abc'.'abc' requires some input that I want to give from within the java program. How do I do that? Then I want to execute the Perl program from within the Java prog. How do I do it?

don't crosspost.
http://forum.java.sun.com/thread.jsp?forum=31&thread=427211&tstart=0&trange=100

Similar Messages

How to execute a Perl program from within a Java prog

How do I execute a Perl program from within a Java program.
Lets say the Perl program that I want to execute is 'abc'. Now, 'abc' requires some input that I want to give it from within the Java program. How do I do it?
And finally, how do I execute that Perl program from within the Java program.
If I execute the Perl program alone then I do it in the following way -
perl abc inp1 inp2 inp3
where inp1, inp2, inp3 are inputs to the Perl program. I will not be able to change or modify the coding of the Perl program - 'abc' as I do not have access to its code. Its a kind of an application whose usual method of execution is in the above shown way. So, how do I execute 'abc' from within a Java program.

what part of don't crosspost, don't you understand?
http://forum.java.sun.com/thread.jsp?forum=4&thread=427193

Executing a perl script from within java application

Hi,
Does anyone knows a way to execute a perl script from within java.
---kirk

Runtime.exec("perl myscript.pl");
Of course whether that "works" depends on what the script does and where the java program runs.

Executing a Java Program from within a Java Program

I need to execute the following Java Program from withing another Java Program. The office toolbar command line is
D:\WINDOWS\system32\java.exe -cp E:\Development\Eclipse\UpdateServer\Classes -server -showversion UpdateServer
I can find no combination of ProcessBuilder commands, including those that include "Cmd.exe /c" that will make this program run from within another Java Program. All the examples I can find only show how to run Windows *.exe programs. I keep getting error 123 from ProcessBuilder.start(), but I can find no documentation for error 123.

Assuming your code didn't get mangled by the forum
(it's missing one "), it may be that your "-cp
E:\\Develop.." argument is getting quoted as it has a
space in it; try passing "-cp" and "E:\\Develop..."
as two arguments.That worked; specifically the following tested OK:
ProcessBuilder pb = new ProcessBuilder("D:\\WINDOWS\\System32\\Java.exe", "-cp", "E:\\Development\\Eclipse\\UpdateServer\\Classes\\", "-server", "-showversion", "UpdateServer" );
pb.directory(new File("E:\\Development\\Eclipse\\UpdateServer\\Classes\\"));
try{
     Process p = pb.start();
     InputStream is = p.getErrorStream();
     InputStreamReader isr = new InputStreamReader(is);
     BufferedReader br = new BufferedReader(isr);
     String line;
     while ((line = br.readLine()) != null)
          System.out.println(line);
     p.waitFor();
}catch(IOException ioe){
I was sure I tried that exact same code before, and it did not work, but now it does, at least at the top level (when it is in main of a test program). I will have to wait to try it until later when it is buried deep in a subroutine.

Running a "heavy" program from within a java class

Dear Java programmers,
I 'm trying to run a software called surflex from within a java class, using the following java command:
Runtime.getRuntime().exec( new String[ { "/bin/bash", "docking_script_2.bash"} );
For convenience I've created the following simple bash script but for some strange reason surflex is not executed:
#!/bin/bash
surflex-dock-v211-linux.exe proto drug.mol2 receptor_hydro.mol2 p1;
surflex-dock-v211-linux.exe dock drug.mol2 p1-protomol.mol2 receptor_hydro.mol2 >& 1OHR_A_output.txt;
Can anybody help me on that (ignore the arguments, they are correctly set)? I'll try to find another, more generic example, but so far I've noticed that the same thing happens with unix grep command.
thanks,
Tom

I think if you want to invoke a bash shell and give it a command to execute, you need to do
/bin/bash -c commandrather than
/bin/bash commandAccordingly, your call to exec should look like
exec( new String[ { "/bin/bash", "-c" "docking_script_2.bash"} );Beyond, that, I'd suggest the following as general debugging tips and best practices:
* As the first line of the bash script, include a line that does something simple, like touch a file, so you can see if the script is executing at all.
* In Java, call Process.waitFor(). Its return value is the process' exit value.
* Make sure you're gobbling stdout and stderr from the process, and giving stdin any input it needs. You'll have to do this for the process to run correctly, and you can also use what you read from stdout and stderr to debug the execution of the process. [http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html]
* You may wan to look into ProcessBuilder, rather than Runtime.exec. I haven't used it myself yet, but apparently it's supposed to be the preferred way to execute external processes.

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

Executing a Perl Script from within a Servlet

I'm trying to call a script from within a servlet.This is the code i'm using:
Process process = Runtime.getRuntime().exec(new String[]{"sh","-c",script,nick,pass});
InputStream input = process.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int i;
while ((i=input.read())!=-1) {
baos.write(i);
System.out.println(baos.toString());
I can`t make it work.This is the output i'm getting.
java.io.IOException: CreateProcess: sh -c /home/script.sh user pass error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.(Win32Process.java:66)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:551)
at java.lang.Runtime.exec(Runtime.java:477)
at java.lang.Runtime.exec(Runtime.java:443)
at controllers.EmailAcountCreate.doPost(EmailAcountCreate.java:34)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
Thanks in advance.

I am facing the same problem. Could you please post the answer if you have one now. Please treat this as very urgent.

How can native executable files be started from within a Java application.

Hi Everyone,
I am currently working on an application that will have the ability to start a program within Windows. What I intend on having is a button within my GUI that can start Microsoft Word. I am completely lost as to where I should begin in order to make this work. If anybody has any pointers they will be greatly appreciated. Thanks.
Regards
D

Hi ,
easy:
Runtime.getRuntime().exec(new String[]{path,name});
see:
http://java.sun.com/j2se/1.3/docs/api/java/lang/Runtime.html
HTH

Permission denied when I execute a unix command from within my java applet.

Hi Gang,
Forgive me if this is not the appropriate forum for this problem. I'm posting this problem on this forum since I got no answers on the other forum I posted on.
I've written a simple java applet that runs a unix command and then displays some information. The applet compiles fine, and runs perfectly from the command line on my unix system.
However, when I point a browser at the applet from my desktop PC I get the following error as taken from the java console:
Exception in thread "AWT-EventQueue-2" java.security.AccessControlException: access denied (java.io.FilePermission <<ALL FILES>> execute)
This is of course the first line in a long line of error messages. It appears that I am not able to execute a command on the unix system through my applet. I know the problem is with trying to execute a unix command since commenting it causes no error in the web browser. This is the command I'm using in java to execute the unix command:
p = Runtime.getRuntime().exec("ps");
Here's the html file on the unix system:
<html>
<head></head>
<body>
<appletcode=G.class height="250" width="400">
Your browser does not support the applet tag.
</applet>
</body>
</html>
I won't list the java code since it is compiling and working on the command line. But, if you want to see it I'll provide it.
I've done quite a bit of research on this and it seems that a great number of people have similar problems reading or executing files through java. I have yet to find a solution to this problem.
Here are some details about my setup:
Server:
HP9000 running HP/UX 11.23
Apache Web Server 2.0.35
Java 1.5
Desktop PC:
Win2K Pro
Internet Explorer 6
Java 1.6
If you have a solution I would be very grateful! This problem is keeping me from writing my application!
thanks!
kev

Multi-posted.
Already answered here http://forum.java.sun.com/thread.jspa?threadID=5225314&messageID=9916327#9916327

Executing C program from with a java program

How do you call a c program from within a java program, and parse arguments into that program and return something.
Cheers for any reply...

Read http://www.javaworld.com/jw-12-2000/jw-1229-traps.html

How to run java programs from a master java program?

Hello,
I have several java programs which run from the command prompt. I am seeking help with code for starting java programs from within a java program. For example, a program called master.java works something like this:
import java.*;
create connection pool
create variables and result sets
start/run slave1.java (var1, var2);
start/run slave2.java (var3, var4, var5);
start/run slave3.java (var1, var4);
end of program master.java
Each of the slave.java programs will run for up to an hour. I do not want the master.java program to pause for each slave program to stop. Instead, the master program will keep running and multiple slave programs will be running simultaneously with the master program. When a slave program starts, it is on its own. Also, if possible, I would like to have each of these slave.java programs open in a new separate command window, so I can observe each slave program running in separate windows.
Any suggestions for code or helpful documentation are greatly appreciated.
Thank you,
Logan

Thank you all.
At the bottom of master.java I have successfully started a batch file with these lines:
String jcmd = "cmd.exe /c start c:/data/simulations/MsgViewCount2.bat";
Process proc = Runtime.getRuntime().exec(jcmd);
But I still cannot get a java program to start. Here is one variation I have tried:
String [] cmdArray = new String[2];
cmdArray[0] = "java";
cmdArray[1] = "slave1";
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(cmdArray);
This compiles, and no errors occur, but nothing happens.
Regarding this comment:
Why Runtime.exec? Either make the slaves Runnable or
just call their main() methods.
Oh, I see. Sepearate output. :PNone of the slave.java programs have any output.
Thanks again.

How to call up an executable file (eg. MSPaint) from within my java program

How to call up an executable file (eg. MSPaint) from within my java program

Ummm... why would you want to get MSPaint anyway? Even in the absense of real software, Java's own graphics tools are way more sophisticated - with a little time and effort, you could write a simple paint package that beat MSPaint hands down.

Start a WS application from within a java program

Hi,
I need to start a WebStart application from within a java program. Therefore I develeoped a class which starts javaws.exe within its main-method like this:
try {
Runtime.getRuntime().exec(
"c:\\java web start\\javaws.exe http://a.b/c.jnlp"
} catch (Exception e) {
e.printStackTrace();
And that did not work. Java Web Start tries to start the .jnlp program but returns with the message, that the app-desc|applet-desc|installer-desc|component-desc is missing. But it is there: It is an applet and thus I defined an applet-dec.
I tried to do it from a command line with the followinf command:
java -Djnlpx.home="C:\abc" -cp "C:\abc\javaws.jar" com.sun.javaws.Main http://a.b/c.jnlp
And that works. But using this command from within my jjava prog using the Runtime.exec() method does not work.
By the way, simply type "javaws http://a.b/c.jnlp" at the command line does not work.
Can anybody help me? How may I start a .jnlp program within another java program.
Kind Regards,
Tobias Neubert

Hi,
I recently had a quite similar problem. At least the error message by the Java Web Start application on Mac OS X complained about the same error (app-desc|applet-desc|installer-desc|component-desc). It turned out to be some bad invisible characters in the jnlp file. I copied some sample from a web page which for some reason contained some unicode chars that the parser doesn't like. Use a different text editor or the less command on unix to see if there are some strange characters in you jnlp file.
But it seems strange that it does work from the command line and not from your code.
-Stefan

JCO.Server Error while trying to execute a RFC program from SAP

Hi,
We are connecting to an external registered server program from SAP via Web Methods.
The external server program is registered with the SAP Gateway. We have created a TCP/IP RFC destination and are able to connect to the destination successfully via SM59.
An RFC function is created in SAP and is called using the syntax CALL FUNCTION "/NGN/BAPI_STRE_SEARCH_PROCESS" DESTINATION 'PRDB2B'. We have also handled the COMM_FALIURE and SYSTEM_FALIURE exceptions in the function call.
We are monitoring the gateway via SMGW and see a connection log to the RFC destination as below
Number - 10
LUname - dev01
TPName - sapgw00
User - KRAORANE
Status - CONNECTED
Symbolic - PRDB2B
Conversation - 86520353
Prot - REG
SAP return code - 0
CPIC rtn code - 0
The external program returns results as expected.
However sometimes the RFC fails and returns the message JCO.Server could not create server function /NGN/BAPI_STRE_SEARCH_PROCESS.
We are not able to figure what exactly is causing this error. Any help will be highly appreciated.
-Kiran

Hi,
Please see the below links..
JCO.Server Error while trying to execute a RFC program from SAP
Re: JCO.Servcer could not find server function
Re: JCO.Server could not find server function 'SET_SLD_DATA'
/people/kathirvel.balakrishnan2/blog/2005/07/26/remote-enable-your-rfchosttoip-to-return-host-ip-to-jco
Re: interfacing SAP with an existing java applications
http://help.sap.com/saphelp_nw04/helpdata/en/47/80f671ee6e4b41b63c0fe46bd6e4f8/content.htm
http://www.sapgenie.com/faq/jco.htm
Regards
Chilla..

How to call Operating System commands / external programs from within APEX

Hi,
Can someone please suggest how to call Operating Systems commands / external programs from within APEX?
E.g. say I need to run a SQL script on a particular database. SQL script, database name, userid & password everything is available in a table in Oracle. I want to build a utility in APEX where by when I click a button APEX should run the following
c:\oracle\bin\sqlplusw.exe userud/password@database @script_name.sql
Any pointers will be greatly appreciated.
Thanks & Regards,

Hi Guys,
I have reviewed the option of using scheduler and javascript and they do satisfy my requirements PARTIALLY. Any calls to operating system commands through these features will be made on the server where APEX is installed.
However, here what I am looking at is to call operating systems programs on client machine. For example in my APEX application I have constructed the following strings of commands that needs to be run to execute a change request.
sqlplusw.exe user/password@database @script1.sql
sqlplusw.exe user/password@database @script2.sql
sqlplusw.exe user/password@database @script3.sql
sqlplusw.exe user/password@database @script4.sql
What I want is to have a button/link on the APEX screen along with these lines so that when I click that link/button this entire line of command gets executed in the same way it would get executed if I copy and paste this command in the command window of windows.
Believe me, if I am able to achieve what I intend to do, it is going to save a lot of our DBAs time and effort.
Any help will be greatly appreciated.
Thanks & Regards,

Executing a Perl program from within a Java prog

Similar Messages

Maybe you are looking for