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

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Problems running external programs from java

Hello.
I wrote a pair of perl scripts and a GUI in java to run them. The first perl script just read the files in one directory makes some changes to the names of the files and then group all this files in a set of new directories. The other perl scripts takes all this new files and calls BLAST sequence alignment program and perform some alignments among these sequences. I tested this scripts and they work fine.
The problem comes when I try to run them for the JAVA GUI. I use RunTime and when I need to run the first perl script it all works well, but when The call to the second perl script is made the program fisishes without doing anything at all. I found out that the problem is that when running the script from the Java GUI it's not able to find BLAST program. So I guess that Java is not really starting a terminal session and it doesn't read my bash_profile to find out the path to my programs.
So, my question is if anyone knows a method to tell Java to load all this paths in the bash_proflie file so all of my scripts work???.
I have no idea is this can be done and how so any advice would be really wellcome.
By the way, my java version is 1.4.2 and my OS is Mac OS X 10.3
Thanks a lot , Julio

Invoke /bin/sh -c and give it your program's full path with.
(To understand what I've written, maybe reading
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps_p.html
http://mindprod.com/jgloss/exec.html
and
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html
(especially the exec(String[] cmdarray) method)
might help)
-T-

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,
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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

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
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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
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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!

Problem executing Unix script from Java...

Hi there, I'm having trouble executing a unix script from a java program. The script receives multiple parameters and it seems that one of them ( or more ) is not well interpreted. When I run the script directly from a shell, the script executes without any errors. But, when I run the exact same script with the exact same parameters, it does not work.
Here is the command to execute the script with all the parameters that is executed from the shell ( with success ) and also from the java program ( with errors ):
/z/opus/dcap/intfu001.csh 'NODEBUG^NOTKPROF^NOSTACK' opus dcap JACQUES JACQUES '2625781' 'ORA$PIPE$001D00D70001' JOB^DEBUG^SINISIMU^STATPROD^DECTIDANC^81^503^4080^86^87^151^97^98^99 BUT^N^N^SPRI^0^13^24^3^J^05^N^19^19^19 >> /tmp/switcher8.999.null.pgm.test
And here is my portion of code that executes the script:
Runtime wShell = Runtime.getRuntime();
Process wProc = wShell.exec(cmd_unix_final);
wProc.waitFor();
return wProc.exitValue();
Please give me your thoughts on this!
Thanks in advance!

Ok.
Let's proceed surgically, else we'll never solve or overcome anything.
In the last your reply you wrote:
the normal output is what I get when the script runs successfully, the script first prints a few things
and then does stuff that takes at least 2 or 3 secondsWhat do you mean?
-Finally have you got your script correctly executed?
The stuffs you spoke of are really performed?
If this is the case I can't see the prob.
Is your concern only about exitValue() for it doesn't let you distinguish programmatically
the success or failure of the script execution?
Of course you surely already have a routine in your java code to handle
exceptional situations of errors from the script.
And the "normal output" is just what you must parse to detect those errors.
Then who cares about exitValue() in this case?
Don't invoke it, relay on the stdout and stderr of the script.
-Or you get only a deceiving standard output
that let you think the script execution went alright, while instead it didn't.
In this case we have to investigate some other thing.
I can't still exclude that the problem isn't related with the buffer size of the stdout
allocated by the environment to the subprocess. You spoke of few things printed out.
Be explicit. What's the size of the output you get?
And is the "normal output" complete till the very last char
or is it truncated from somewhere on?
Also it's important that you hit a ps command after the java main process terminates
(or simply when waitFor() returns) and see if the script subprocess hung up.
As an alternative approach directly call your pro*C code from Java through JNI, instead of translating it.
1. Exec.java
public class Exec{
     static{
          System.loadLibrary("Exec");
     public static native void proCFunct();
     public static void main( String[] args){
          proCFunct();
}2. javac Exec.java
3. javah Exec
4.Exec.c
#include "Exec.h"
JNIEXPORT void JNICALL Java_Exec_proCFunct(JNIEnv * a, jclass b){
     //here call the function that executes the script
5. cc -G -I$JAVA_HOME/include -I$JAVA_HOME/include/solaris -I$YOUR_INCLUDES Exec.c -o libExec.so
6. setenv LD_LIBRARY_PATH .
7. java Exec

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.

Starting a external program from java

hi iam trying to start MySQL server from java, the command in dos is as follows C:\mysql\bin\mysql -u username -p ,then the user hits return and the user is prompted to enter a password. i have got as far as entering the the C:\mysql\bin\mysql -u username -p but dont know how get the prompt back to the java program i would be greatfull if anyone could tell me where iam not doing,heres my code so far
try{
Runtime r=null;
r=r.getRuntime();
Process p=r.exec("C:/mysql/bin/mysql -u mark_r -p");
p.waitFor();}
catch(Exception ex){System.out.print("Error");}}

You should try using the getOutputStream() and getInputStream() methods for the Process object. Each returns either an inputStream or OutputStream object.
You should be careful if the mySQL password is added to the command since anyone doing a 'ps' on the machine could see the password.

Controlling external programs from Java

Hi,
I try to invoke an external command-line program in Windows 2000 fron Java. I do this by
Process proc = Runtime.getRuntime().exec(cmd);
cmd is a String representing a command. For instance I try to control the gnupg program by
"cmd /c C:\\gnupg\\gpg --list-keys"
This works fine. But when I want to make a more advanced control, when gnupg waits for more than one input, and that input can't be put on the same line I get problems.
When running gpg --edit-key SomeKey on the command line I have to enter
trust - return - 5 - return - yes - return - quit
How do I do this?

this is how to do it! gotta listen to the output to prevent deadlock. you can pass in parameters o the initial call as well (a string array, where string[0] = command, string[...] = input argument) or write it to the output stream of the process.
hope this helps
public void run_command(String starting_command, String[] further_commands)
Process proc = Runtime.getRuntime().exec(starting_command);
Listener.make(proc.getInputStream());//these listen to the streams
Listener.make(proc.getErrorStream());//which prevents deadlock
PrintWriter writer = new PrintWriter(new OutputStreamWriter(proc.getOutputStream()));
for(int i = 0;i < further_commands.length;i++)
writer.println(further_commands);//you could put the extra stuff as the first string in this array
import java.io.*;
public class Listener extends Runnable
BufferedReader reader;
public static void make(InputStream in)
Listener l = new Listener(in);
Thread thread = new Thread(l);
thread.start();
public Listener(InputStream in)
reader = new BufferedReader(new InputStreamReader(in));
public void run()
String string;
while(true)
string = reader.readLine();
try
Thread.sleep(1000);
catch(Exception e)

Invoke external programs from Java

I am running a Java program which will be used to invoke other command line programs in Windows.
However, it seems Java has problem in checking the termination state of command line programs in Windows. In the example below, the pp.waitFor() will keep waiting even if the command completed execution. I try the same code below in Unix and it works without problem. Is there anyone has come across the same problem before ?
I am using JDK1.4.1.
try {
Process pp = null;
BufferedInputStream bi = null;
pp=Runtime.getRuntime().exec("dir");
bi = new BufferedInputStream(pp.getInputStream());
pp.waitFor();
int size=bi.available();
while (size>0) {
byte[] buf = new byte[size];
bi.read(buf);
System.out.println(new String(buf));
size=bi.available();
} catch (Exception e) {
System.out.println("Exceptions !!!");
System.out.println(e.getMessage());

I found this article rather helpful:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

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.
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            //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;
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                bis.read(b);
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            getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + tmp);
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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

Execute linux command from java

I wanna execute linux command from java, bu the output has error:
Return code = 1
top: failed tty get
The code as:
import java.io.*;
public class Execute {
     public static void main(String[] args) {
          try {
               final Process process = Runtime.getRuntime().exec("top");
               new Thread() {
                    public void run() {
                         try {
                              InputStream is = process.getInputStream();
                              byte[] buffer = new byte[1024];
                              for (int count = 0; (count = is.read(buffer)) >= 0;) {
                                   System.out.write(buffer, 0, count);
                         } catch (Exception e) {
                              e.printStackTrace();
               }.start();
               new Thread() {
                    public void run() {
                         try {
                              InputStream is = process.getErrorStream();
                              byte[] buffer = new byte[1024];
                              for (int count = 0; (count = is.read(buffer)) >= 0;) {
                                   System.err.write(buffer, 0, count);
                         } catch (Exception e) {
                              e.printStackTrace();
               }.start();
               int returnCode = process.waitFor();
               System.out.println("Return code = " + returnCode);
          } catch (Exception e) {
               e.printStackTrace();
}Help please.

Your code is probably good to run a program, that does not use terminal capabilities.
Program "top" is a little bit more complicated - you have to run it with a real terminal.
Try to run "xterm -e top". You can find an example how to run an external program
from java code in cnd/gdb module on http://cnd.netbeans.org
For example, take a look at openExternalProgramIOWindow() method on this page:
http://cnd.netbeans.org/source/browse/cnd/gdb/src/org/netbeans/modules/cnd/debugger/gdb/proxy/Attic/GdbProxyCL.java?rev=1.1.2.6.2.5&only_with_tag=release551_fixes&view=markup
It runs a command with external terminal.
Thanks,
Nik

Is it possible to execute SAPGUI scripts from java program?

Hi everyone..
     I need to develop an java applications that executes the SAPGUI script or any technique that execute set of transaction as client.
     Is it possible to execute SAPGUI scripts from java program? if so, how it can be achieved? is there any other technique to achieve above mention scenario?.
     it will be more helpful, if docs related to that are shared..
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Oh, bummer. Would be much more convenient if I could just use iTunes for everything. Can't stand WMP. I wonder if WinAmp might be a good compromise?
Thanks for this answer . . .
Sharon

Executing batch file from Java stored procedure hang

Dears,
I'm using the following code to execute batch file from Java Stored procedure, which is working fine from Java IDE JDeveloper 10.1.3.4.
public static String runFile(String drive)
String result = "";
String content = "echo off\n" + "vol " + drive + ": | find /i \"Serial Number is\"";
try {
File directory = new File(drive + ":");
File file = File.createTempFile("bb1", ".bat", directory);
file.deleteOnExit();
FileWriter fw = new java.io.FileWriter(file);
fw.write(content);
fw.close();
// The next line is the command causing the problem
Process p = Runtime.getRuntime().exec("cmd.exe /c " + file.getPath());
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while ((line = input.readLine()) != null)
result += line;
input.close();
file.delete();
result = result.substring( result.lastIndexOf( ' ' )).trim();
} catch (Exception e) {
e.printStackTrace();
result = e.getClass().getName() + " : " + e.getMessage();
return result;
The above code is used in getting the volume of a drive on windows, something like "80EC-C230"
I gave the SYSTEM schema the required privilege to execute the code.
EXEC DBMS_JAVA.grant_permission('SYSTEM', 'java.io.FilePermission', '<<ALL FILES>>', 'read ,write, execute, delete');
EXEC DBMS_JAVA.grant_permission('SYSTEM', 'SYS:java.lang.RuntimePermission', 'writeFileDescriptor', '');
EXEC DBMS_JAVA.grant_permission('SYSTEM', 'SYS:java.lang.RuntimePermission', 'readFileDescriptor', '');
GRANT JAVAUSERPRIV TO SYSTEM;
I have used the following to load the class in Oracle 9ir2 DB:
loadjava -u [system/******@orcl|mailto:system/******@orcl] -v -resolve C:\Server\src\net\dev\Util.java
CREATE FUNCTION A1(drive IN VARCHAR2) RETURN VARCHAR2 AS LANGUAGE JAVA NAME 'net.dev.Util.a1(java.lang.String) return java.lang.String';
variable serial1 varchar2(1000);
call A1( 'C' ) into :serial1;
The problem that it hangs when I execute the call to the function (I have indicated the line causing the problem in a comment in the code).
I have seen similar problems on other forums, but no solution posted
[http://oracle.ittoolbox.com/groups/technical-functional/oracle-jdeveloper-l/run-an-exe-file-using-oracle-database-trigger-1567662]
I have posted this in JDeveloper forum ([t-853821]) but suggested to post for forum in DB.
Can anyne help?

Dear Peter,
You are totally right, I got this as mistake copy paste. I'm just having a Java utility for running external files outside Oracle DB, this is the method runFile()
I'm passing it the content of script and names of file to be created on the fly and executed then deleted, sorry for the mistake in creating caller function.
The main point, how I claim that the line in code where creating external process is the problem. I have tried the code with commenting this line and it was working ok, I made this to make sure of the permission required that I need to give to the schema passing security permission problems.
The function script is running perfect if I'm executing vbs script outside Oracle using something like "cscript //NoLogo aaa1.vbs", but when I use the command line the call just never returns to me "cmd.exe /c bb1.bat".
where content of bb1.bat as follows:
echo off
vol C: | find /i "Serial Number is"
The above batch file just get the serial number of hard drive assigned when windows formatted HD.
Same code runs outside Oracle just fine, but inside Oracle doesn't return if I exectued the following:
variable serial1 varchar2(1000);
call A1( 'C' ) into :serial1;
Never returns
Thanks for tracing teh issue to that details ;) hope you coul help.

Pocket PC -Problem executing external program from java

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