Calling external programs from within a Tomcat application

I've got a fairly complex existing Tomcat application (which is packaged and built as a .war file) which I'm trying to edit so that it calls a Perl script part way through the processing, which will generate an XML file used later on. I think I've worked out how to call external scripts from within Java, but at the moment when I try and access the application via Tomcat the application either hangs or bails out (I don't know which, as the log files unhelpfully don't give any error messages).
The code which is causing the problem looks like this:
System.err.println("Calling runtime...");
Runtime runtime = Runtime.getRuntime();
System.err.println("Executing process...");
Process process = runtime.exec("/path/to/ysearch.pl 'News' '\"search query\"' 'file");
System.err.println("Waiting for process...");
int exitVal = process.waitFor();
System.out.println("Exited with error code: " + exitVal);The code gets as far as "Executing process..", beyond that there is nothing in the log file so I presume the runtime.exec() call is where the problem is. I'm not interested in reading the output from the script (there shouldn't be any), so that's not an issue, and the permissions on it allow anyone to read or execute ysearch.pl so I don't think there's a problem in that area.
Does anyone have any suggestions which I could try to get this to work? I've only been using Tomcat for a week (I'm picking up on someone else's code) so I might have made a beginner's mistake. I'm using Tomcat 5 on Fedora Core 7, and Java 1.5.0_01 (I can't easily change any of those).

I'm not sure, but I thing that overhead caused by calling du cannot be big enough to matter even on older machines.
But, when calling du from Perl script you are also invoking shell, and this can be a little bit more 'heavy'.

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Hi,
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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.
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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)
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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

Calling a webservice from within Bex Web Application Designer

Hi
I have a web-template built with BEx web application designer which also contains textboxes. This text should be stored by calling a webservice (standard BI-documents are not an option).
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Kind regards.
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Thanks for your response. The BSP page would work out fine if I only needed to save the data.
But the next time I call the webtemplate, the textarea should be filled by another webservice call with the stored text (so the text can be modified und saved again). This will not be possible by calling a BSP page.
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Calling external program from PL/SQL

Does anyone know whether it's possible to call an external program living outside of Oracle from PL/SQl eg. a from a stored procedure?
Specifically i want to call back into my java appserver (ejb server) when a trigger/stored proc. is executed.
The call does not have to be synchronous, some sort of queue will do - eg JMS??
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null

Hi
Which version of oracle you are using.
If it 8i, you can use external procedures/libraries. REfer to ORacle PLSQL documentation.
If you are using Oracle 7+ you can use dbms pipes to post your command string and a cron job to read the pipe and execute the string.
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HTH
Arvind Balaraman

Calling external programs from Java?

Hi All,
Is there a way of calling external applications from Java without using Runtime.exec(). That method seems quite messy when you are dealing with streaming data from an input file to an output file. Basically what I'm asking is there a way to run a command the same way you would type it in a command shell?
Thanks

LeWalrus wrote:
Ok, I've an external application that I want to be called inside a Java GUI. It has several input arguements, which the format looks something like:
programname inputfile > outputfile
Simple enough.
>
Works fine from a shell command line. From what I understand, this won't work using Runtime.exec() because that method will just start the application. Works fine from Runtime.exec(). Since you are'>' to write stdout to a file you need to us a shell to execute the command.
String[] command = {"sh", "-c","programname inputfile > outputfile"};
Process process = runtime.exec(command);
You need to read, digest and implement the recommendations given in http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html .
File input and output from the application has to be taken care of programatically (java.io stuff). Fine if you've only one input and output. But if you have several input files and hundreds of output files, where does this leave you. It would be much easier if you could pass a string command to the shell directly as if you typed it in the command line yoursel!

Calling external program on application server

Hi, everyone. I'm trying to call an external program from ABAP by using SM69 and FM SXPG_COMMAND_EXECUTE
MOVE 'zlong_bat' to ld_comline.         "Maintained using trans SM69
* Execute external command, contained in 'ld_comline'
CALL FUNCTION 'SXPG_COMMAND_EXECUTE'
       EXPORTING
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*           operatingsystem               = 'UNIX'
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IF sy-subrc NE 0.
ENDIF.
In the sm69, I define zlong_bat with
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It can run well if remoteconn.bat contain some simple command of dos like dir, md, mk... But when I call a program from remoteconn.bat, the abap program hang. I also cannot test in sm69 because it hang too.
If I call direcly from sm 69 with
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localhost -u test -p 1234
or
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The SM69 also hang.
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Thank you in advance.
Regards,
Long
Edited by: dragonking88 on Aug 25, 2010 12:54 PM

Hi Long Le Hoang,
I am running a shell script fromSM69 which call psexec.
shell script runs fine but SM69 execution goes on hold.
Can you please help me how to terminate SM69 execution.
Alpa

Calling external Java from ABAP using JCo?

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We are presently using JCo to communicate from Java to SAP.
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Fred

Hi Gregor,
I was hoping you would reply to this -- these posted messages had been here for quite sometime now.
Anyway, here's the case. Our Basis team is installing the JCo in our SAP development server. This is our first time to implement this technology, so no one has a clue at all.
Got a couple of questions for you...
1. What do we need the JDK for? Is it mainly for editing, running, and compiling java files (e.g. Example5.java)?
2. Does the JDK need to be installed at the SAP server as well? Or it doesn't matter, as long as the java files will be accessible from where it was installed at?
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How to call external programs?

I have seen people call external programs through LabVIEW and was curious what functions you could use to do this.
I'm pretty sure its using one of the ActiveX functions or maybe 'open application reference .vi'.
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Cory K
Solved!
Go to Solution.

Cory K wrote:
Where did they get this:
Kudos for going from "I don't know to start" to "Let's stump Ben" with only the second post to this thread.
I either copy it from an example or try to browse to it.
NOTE:
If you plan to work with MS ActiveX objects, I found it very helpful to do a custom install of Office and make sure the help files for VBA are loaded. These will at the least give you an idea of what the methods are and what parameters go with each.
Ben
Message Edited by Ben on 12-31-2008 11:09 AM
Message Edited by Ben on 12-31-2008 11:13 AM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
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How to call java program from ABAP

Hi Experts,
My requirement is to call java programs from ABAP. For that i have set up SAP JCO connection by using this link http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/739. [original link is broken] [original link is broken] [original link is broken] Connection gets sucessfully. After this how to call java program from ABAP as per our requirement. Please help me out.
Also i tried this way also.. but while executing the DOS Command line appear & disappear in few seconds. So couldnt see the JAVA output. Please help me out to call java programs in ABAP..
DATA:command TYPE string VALUE 'D:Javajdk1.6.0_20 injavac',
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This depends on the version of your Netweaver Java AS. If you are running 7.0, you will have to use the Jco framework. The Jco framework is deprecated since 7.1 though. If you want to build a RFC server in 7.1 or higher, it is adviced that you set it up through JRA.
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http://help.sap.com/saphelp_nw04/helpdata/en/6a/82343ecc7f892ee10000000a114084/frameset.htm
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Start a BO report from within a web-application.

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Call C++ programs from PL/SQL

Can someone give me an example of how to call C++ programs from PL/SQL ASAP please?
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Hello,
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Is it possible, when i call a vi from within my code, to pass to it parameters as input and to return some values too?

Hi There!
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Hi Matrix,
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Nederlandse LabVIEW user groep www.lvug.nl
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How to execute a Perl program from within a Java prog

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And finally, how do I execute that Perl program from within the Java program.
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what part of don't crosspost, don't you understand?
http://forum.java.sun.com/thread.jsp?forum=4&thread=427193

Calling Java programs from Oracle Stored Procedure

Is it possible to call Java programs from Oracle stored procs? If possible Can this be used to exchange data from other applications? Is there a better method/feature in oracle for doing data exchange with other apps?

If what you mean by Oracle stored procedures is pl/sql then yes.
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Calling external programs from within a Tomcat application

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