Executing a runtime.exec statement from an ejb

Hi all,
relativly new to j2ee. I need to use the runtime.exec command to uncompress a set of files from an ejb.
So far, ive tried that and even the most basic commands like
/usr/bin/ll *
and i don't get any response back other than: exit value = 2
when executing:
Runtime runtime = Runtime.getRuntime();
// Process proc = runtime.exec("/usr/bin/uncompress "+this.localFileStore+"*.Z");
Process proc = runtime.exec("/usr/bin/ll * ");
// put a BufferedReader on the ls output
InputStream inputstream = proc.getInputStream();
InputStreamReader inputstreamreader = new InputStreamReader(inputstream);
BufferedReader bufferedreader = new BufferedReader(inputstreamreader);
// read the ls output
String line;
while ((line = bufferedreader.readLine()) != null) {
System.out.println(line);
// check for ls failure
try {
if (proc.waitFor() != 0) {
System.err.println("exit value = " + proc.exitValue());
catch (InterruptedException e) {
System.err.println(e);
No output from the buffered reader. Any one have any ideas as to why i cannot execute any runtime commands? This is also related to the thread i created where i'm looking for a java library for uncompressing a unix compressed file (unix compress = *.z and not zip or gz files). I think my only two options are to either use the runtime to uncompress these files or.. use some java library to uncompress these files. Let me know if anyone can offer any hints/helpfull comments/libs
Thanks a bunch

I might be wrong on this one, but I believe using Runtime.exec() would generally be frowned upon when invoked from an EJB. The reason? EJB implies a remote call. Can you guarantee that a given native process or service will be available on all possible remote nodes that the EJB might be deployed on? Maybe. Can it actually be achieved? Yes. Is it in the spirit of EJB? Probably not.
- Saish

Similar Messages

Can MS Word Macros be executed with Runtime Exec.

When I open the Run Dialog box in Windows and type in - WINWORD.EXE c:\test.rtf /n /mFilePrint /mFileExit
the file - C:\test.rtf is printed using the Macros FilePrint and the application closes.
Now when I try to do the same in java using an instance of the Runtime class and pass the exec method a String[] with the same contents , it cannot find the executable WinWord.exe .
So i used the cmd /c option and specified the file name to open the file.
Runtime.getRuntime().exec("cmd /c \""+newfile+"\""); // newFile = String rep of path to the file But when i use /m which is a MS Word command line switch - The program compiles successfully and does nothing.Is there any way of executing the Macro

have a look at this here article:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Using Runtime.exec to execute a C++ executable

Hello,
I would like to know if it possible to execute a C++ executable using Runtime.exec() and wait for it to complete and how do I read back the output file created by the C++ executable into the Java Code?
TIA.
RHP

When I execute the code with Runtime.exec(), and read
from the Process's inputStream I am ablt to view the
cout from the C++ code. But the output file that has
to be created by the C++ code is not created,Then this is maybe an error in the C++ code? Maybe you don't have permissions to create that file where you want to.
where
would the output from the C++ code go to when I use a
ofstream in my C++ code andIf you create the file stream in C++ with an absolute file name then the output goes into that file. If it's a relative file name, then the basis is most likely the current working directory (found in the system property "user.dir" if you used one of Runtime's methods without the File argument, otherwise it's the directory you provide.
How do I read both streams
from the Java Code?You create an FileInputStream and - if you want to read character instead of binary data - on top of that an InputStreamReader. You might add a BufferedReader on top of that if you want to read line by line.
does that answer your questions?
robert

Problem to execute cvs command using Runtime.exec method

Hello,
I want execute this cvs command, with this options:
cvs -d :pserver:[email protected]:/home/cvs/cvsroot rlog -S -d "2007/05/01<now" Project
I tried to execute with Runtime.exec() :
Runtime.exec("cvs -d :pserver:[email protected]:/home/cvs/cvsroot rlog -S -d \"2007/05/01<now\" Project");
But I have an error because the smaller character is interpretate as a redirection, no as a smaller symbol.
How I can do to use this command with Runtime.exec ?
Thanks.
Regards.

Sorry,
I had a typing mistake.
I want say:
Runtime.exec("cvs -d :pserver:[email protected]:/home/cvs/cvsroot rlog -S -d \"2007/05/01<now\" Project");
Regards.

Trying to run external script using Runtime.exec

Hey,
I am trying to use Runtime.exec(cmd, evnp, dir) to execute a fortran program and get back its output, however it seems to always be hanging. Here is my code snippet :
            Process process = Runtime.getRuntime().exec(
                  "./fortranCodeName > inputFile.txt" , null, new File("/home/myRunDir/"));
            InputStream stream = new InputStream(process.getInputStream());
            InputStream error = new InputStreamr(process.getErrorStream());
            BufferedReader stdoutReader = new BufferedReader(new InputStreamReader(stream));
            BufferedReader erroutReader = new BufferedReader(new InputStreamReader(error));
            System.out.println(stream.available()); //returns 0
            System.out.println(error.available());     //returns 0
            while (true) {
                String line1 = stdoutReader.readLine(); //hangs here
                String line2 = erroutReader.readLine();
                if (line1 == null) {
                    break;
                System.out.println(line1);
                System.out.println(line2);
            }I know for a fact that this fortran code prints out stuff when run it in terminal, but I don't know if I have even set up my Runtime.exec statement properly. I think I am clearing out my error and input streams with the whole reader.readLine bit I have above, but I am not sure. If you replace the command with something like "echo helloWorld" or "pwd", it prints out everything properly. I also am fairly confident that I have no environmental variables that are used in the fortran code, as I received it from another computer and haven't set up any in my bash profile.
Any Ideas?

Okay, so I implemented the changes from that website (thanks by the way for that link, it helps me understand this a little better). However, my problem is still occuring. Here is my new code:
            class StreamThread extends Thread {
            InputStream is;
            String type;
            StreamThread(InputStream is, String type)
                this.is = is;
                this.type = type;
            public void run()
                try
                    InputStreamReader isr = new InputStreamReader(is); //never gets called
                    BufferedReader br = new BufferedReader(isr);
                    String line=null;
                    while ( (line = br.readLine()) != null)
                        System.out.println(type +">"+ line);
                    } catch (IOException ioe)
                        ioe.printStackTrace();
        try {
            Process process = Runtime.getRuntime().exec(
                  "./fortranCodeName" , null, new File("/home/myRunDir/"));
            StreamThread stream = new StreamThread(process.getInputStream(), "OUTPUT");
            StreamThread errorStream = new StreamThread(process.getInputStream(), "ERROR");
            stream.start();
            errorStream.start();
            int exitVal = process.waitFor(); //hangs here
            System.out.println("ExitValue: " + exitVal);

Runtime.exec() process output

I am having strange problems with the output from a program I am executing with Runtime.exec(). This program takes voice input, and generates text output on the commandline. For some reason, I do not see any of the output until the program exits, then everything is displayed. My code is below, any help would be greatly appreciated!
Thanks,
Deena
import java.io.*;
import java.util.*;
//Reads and prints the output streams from an executing process
class ProcessStream extends Thread{
     InputStream is;
     String type;
     ProcessStream(InputStream is, String type){
     this.is = is;
     this.type = type;     //type of output stream, e.g. stdout or stderr
     public void run(){
     try{
          BufferedReader br = new BufferedReader(new InputStreamReader(is));
          String line=null;
               //read and display the output stream of an executing process
          while ((line = br.readLine()) != null){
          System.out.println(type + ">" + line);
     } catch (IOException ioe){
     System.err.println(ioe);
//Interface to TalkBack.exe
public class JTalkBack{
     public static void main(String[] args){
     try{
          String arg="TalkBack.exe -noTTS -noReplay";     //program to execute
          //arguments to program
          for(int i=0; i<args.length; i++){
               arg+=" "+args;
          //execute the program and get an object representing the process
          Process p=Runtime.getRuntime().exec(arg);
          //create stream processors for stdout and stderr of the process
          ProcessStream error = new ProcessStream(p.getErrorStream(), "ERROR");
          ProcessStream output = new ProcessStream(p.getInputStream(), "OUTPUT");
          //start the stream processors
          error.start();
          output.start();
          //wait for the process to finish and get its exit value
          int exitVal = p.waitFor();
     System.out.println("ExitValue: " + exitVal);
     catch (Throwable t){
     System.err.println(t);

I have something similar and it works. The only difference is that I:
1. used a BufferedInputStream instead of the BufferedReader, which means bis.available() and bis.read(buffer) were used instead of .readLine(bis)
2. Didn't print to stdout, but instead fired a proprietary MessageEvent with the string in it to all MessageListeners (good for use with java.util.logging)
3. Didn't (yet) put the input streams in different threads.
Maybe it is related to the fact that you are printing directly back to the System.out again? Does each process in Java get its very own standard out? I don't know.
It's ugly and convoluted, but maybe a snippet of my code will help...
(in run)
Thread myThread = Thread.currentThread();
try {
    proc = r.exec("my_secret_process.exe -arg arg");
    is = new BufferedInputStream(proc.getInputStream());
    while (thread == myThread) {
      int iRead = 0; //how many bytes did we read?
      //message stream check
      if(is.available() > 0) {
        iRead = is.read(buf);
        msg = "\n"+new String(buf, 0, iRead);
        this.fireMessageArrived(new MessageEvent(this, msg));
     } //end while
   } catch(Exception e) {
      System.out.println("Argh. Barf.");
Tarabyte :)

Problem with Runtime.exec(gcc -c...

when I execute
P=Runtime.exec("cmd.exe /C gcc -c file.c");
I do not have any problem but ,I do not obtain the corresponding file .o
Somebody can help me, please?

Are you checking the command is running. Unless you read the output of the process you will not see any errors.
try
     public static void main(String[] args) throws IOException, InterruptedException {
          Process p1 = Runtime.getRuntime().exec("cmd.exe /C echo hello");
          System.out.println("Exit code = " + p1.waitFor());
          // produces an error.
          Process p2 = Runtime.getRuntime().exec("cmd.exe /C dontecho hello");
          System.out.println("Exit code = " + p2.waitFor());
     }

Execute java class from a batch file called from runtime.exec

Hi.
I don´t know if this question fits here.
I wan´t to execute a batch file (on Win XP) with runtime.exec. That batch file will execute another java program.
I have the following code:
Resolutor.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class Resolutor {
      * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          Runtime r = Runtime.getRuntime();
          //String[] command = { "cmd.exe", "/C",".\\lanzar.bat .\\ .\\ 001.res:001.dtt" };
          String[] command = { "cmd.exe", "/C",".\\tarea\\lanzar.bat " + args[0] + " " + args[1] + " " + args[2]};
          try {
               //Process proceso = Runtime.getRuntime().exec("lanzar.bat");
               Process proceso = Runtime.getRuntime().exec(command);
               InputStream stderr = proceso.getErrorStream();
            InputStreamReader isr = new InputStreamReader(stderr);
            BufferedReader br = new BufferedReader(isr);
            String line = null;
            System.out.println("<ERROR>");
            while ( (line = br.readLine()) != null)
                System.out.println(line);
            System.out.println("</ERROR>");
               int exitVal = proceso.waitFor();
               System.out.println("EXITVAL: " + exitVal);
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          } catch (InterruptedException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
}lanzar.bat
java Lanzador %1 %2 %3Lanzador.java
import java.util.Vector;
public class Lanzador {
      * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          Repetitiva rpt=new Repetitiva();
          String rutaFicheros=args[0];
          String rutaResultado=args[1];
          String[] ficheros=args[2].split(":");
          Vector<String> ficheroDatos=new Vector<String>();
          for(int i=0;i<ficheros.length;i++){
               ficheroDatos.add(ficheros);
               System.out.println(ficheros[i]);
          System.out.println("RUTA DE FICHEROS: " + rutaFicheros);
          System.out.println("RUTA DE RESULTADOS: " + rutaResultado);
          System.out.println("CALCULAR");
          rpt.setRepetitiva(ficheroDatos, rutaFicheros, rutaResultado);
          rpt.calcular();
}I´ve got Resolutor.class in /res and the other two files (and the rest of the files for running) in /res/tarea.
If I execute /res/tarea/lanzar.bat from the command line everything works fine, it calls java and runs lanzador without problem.
The problem comes when I try to execute the batch file via Resolutor.class. It executes the batch file without problem, but it throws a *java.lang.NoClassDefFoundError: Lanzador* when launching the new java application.
Any ideas of how can I solve that problem. (It must do it via batch file).

Well, I tried putting in the bat file java -classpath .\tarea Lanzador %1 %2 %3 and didn´t work.
I ve tried the bat modification, and the directory in x.txt is k:\res instead of k:\res\tarea.
I´ve tried to modifiy it to java .\tarea\Lanzador and didn´t work so I have put a cd like the following and it appears to work.
cd tarea
java Lanzador %1 %2 %3Thanks for the replies.

Runtime.exec() ... executing a java jar from within an NT command file

Hello,
I spent the better part of yesterday seeking insight to this with little success. So I hope someone here can direct me in a productive direction.
I set-up my runtime.exec in a manner similar to the article on javaworld.com which is often referred to here, with two threads to empty the output and error streams of the NT command file I am executing.
The command file works perfectly from the command line.
I am currently attempting to build a gui which will automate regression testing for another application. This requires third party software to be running prior to the execution of the test suite. This third party software is started using an NT command file. The command file sets up an environment (classpath, server flags, etc.) and then executes a jar file. When this command file is run from my Gui, the output is identical to the command being run from the command line. Then when the jar file is to be executed, the command file output shows a "file not found" error, but only when executed from my Gui.
My call to runtime exec looks like this.
cmdString = new String("commandtoexecute");
fileLoc = new String("Fully qualified path to command file");
String [] envp = new String[0];
testProcess = Runtime.getRuntime().exec(cmdString, envp, fileLoc);
// some code to process the output streams of testProcess
Other Info:
Gui currently executed within Eclipse IDE
BEA WebLogic is the third party software

First, my app has the requirement of allowing the user to start WebLogic if it is not already running.Unfortunately, I can't change the requirement.
But I would say that in a production environment WebLogic should always be running.
I guess it's an assumption that I'd make a priori. You're jumping through too many hoops to accomplish something that is better solved with a phone call to the server admin: "Please start the WebLogic service."
.... Side question ... any recommendations on detecting if it is already running? grin
Yes, call the server admin and ask why you can't have 99.999% availability of a critical resource.
Second, development is on a hardened system (i.e. very
long time getting approval for additional software on
the system).Cactus and JUnit are both open source. No fees involved. If you can install a JAR, you can use these tools.
Better yet, you can drive them automatically as part of your Ant build process. A GUI implies a person in front of it to start and monitor the tests. JUnit and Ant are all about automating these things so they're run every time you rebuild and redeploy the code. You get XML reports on test results that are displayable in a browser. You can even e-mail the test summary to all developers so they can see if a test broke the build. If a test breaks, you don't deploy. That's the way to go, IMO.
When you have a working Ant build.xml, the next step is to automate the build completely using a tool like ThoughtWorks' CruiseControl.
Thank you for you suggestions though. I will read up on Cactus to see if it could help me here.You're welcome. Good luck. Sorry that I'm not more help.

Executing DLLs from Java using JNI vs Runtime.exec()

I am trying to understand the best way to execute a dll using java. The dll I am testing with takes a few input parameter. If I use JNI with System.loadLibrary("dll"); what do I need to do to pass the arguements in as well? Can I just add the arguements in the java code like private int xyz = "value"; and expect that the dll will accept them or is there special definitions I have to set up in the dll to make it work?
Alternatively I was looking at using Runtime to execute the dll by using Runtime.exec("dll param1 param2",env,filePath); Does anyone know if there are drawback to doing it this way vs. using JNI or is this just as efficient? Any help would be appreciated.

You seem to be confused...
"execute a dll using java"
Unless I'm mistaken, a dll is not executable. A dll is a library of code. This code has (hopefully) some well-defined entry points (declared in a header file somewhere) which you must call in a C/C++ file. The arguments you pass to the dll will come from java through JNI.
As far as your understanding of this entire process, it is obviously confused beyond the scope of a simple reply. I recommend you read the examples and ALL of the documentation available here:
http://java.sun.com/docs/books/tutorial/native1.1/index.html
When you get the/an example running (or just set up to run) then post your code and comments here for more help.
Ian

Runtime.exec not executing the command !

Hi all,
I'm connecting to Progress Db thru JDBC trying to execute a stored procedure
which has a statement
Runtime.exec("ksh -c aa") where aa is aunix script which i'm trying to run from java snippet .
when i run this code as a seperate java program it executes the script
"aa" but thru JDBC connection it does not execute the command
what could be the reason ???
thanx in advance,
Nagu.

Hi Rick,
"aa" is the shell script which is lying in the user DIR .
It is returning a non-zero value. what kind of permissions be there for to execute the Shell command?
Regards,
Nagarathna.

Runtime.exec() - Need to execute unix command through pipe

I want to execute something like this from Runtime.exec() :
tar -czp -C /tmp/ myfile | ssh -qx -c blowfish remoteHost tar -xz -C /tmp/
If I give the complete string as it is, then the system takes ssh command and the arguments to ssh (-qx) as arguments for tar and, thus, fails. I guess the reason is that the Runtime just takes the first string as the command and passes everything else as arguments to the command.
How can I achieve this?

The pipe symbol is interpreted by the shell, so you'd need the command you execute to be a shell (/bin/sh, /bin/csh /bin/bash, etc.) and the rest of it to be the args to that shell.
Look at the man page for your shell. There should be a -c or somesuch argument that means "take the rest of this line as a command to execute in the shell I'm creating, which will then execute."
Something like /bin/bash -c foo \| bar Not sure if you have to escape the pipe or not. Futz around with it and see.

Runtime exec problem to execute a C program

Hi,
I've spend lot of time trying to find a solution without success...
My aim is to run a C program from a java application under linux. My C code is the following:
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
main(int argc, char **argv){
printf("hello world \n");
Once compiled I run my java application wich run the binary through a runtime.exec().
I followed the example given by
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html
with the same input gobblers and threads.
For some reason it doesn't work: nothing comes out...
When I call "ls" instead of my binary it works perfectly!
WHY??
Any help would be greatly appreciated!

Thanks for the reply.
Yes it seems that JNI could be a solution, but it looks a bit complicated an maybe not so well adapted to my purpose.
The executables I want to execute from my java application don't need any arguments.
If JNI is really the only way I'll try to use it but is there any good reason why runtime exec doesn't work? It is supposed to execute any executable isn't it?
cheers

Exec SQL statement from BW to MS SQL

Hi Experts,
I need to execute sql statement from BW on MS SQL Server.
I want to do it in process chain. There is a so called ABAP Program Component.
How to implement such a program or function module that will execute on MS SQL Server an sql statement such as for instance:
"Create view SOME_VIEW as select * from XTABLE".
I have already configured database connection using DBCO transaction.
Waiting for response.
Krzysztof

Thanks, but that is not what I was asking for.
I just need to send some SQL statement from BW to MS SQL Server using ABAP program (exec sql or something like this).
Could you provide me a pattern of such an ABAP program?
The sql statement is not importent here, I have already extracted data from MS SQL to BW, I have configured dataflow, process chains and so on.
No I need to determine DELTA on MS SQL Server. I've got some ideas but I need to know how to send SQL statement from BW to MS SQL Server using ABAP program.
Please any help will be appreciated

How do you prevent MS-DOS window from appearing during Runtime.exec()?

The question below was attached to the answer for Question of the Week No. 21. I'm having the same problem. Does anyone know the answer? Put another way does anyone know how javaw does it?
Fri Dec 18 09:59:52 PST 1998
rkarasek
On Windows NT 4.0, how can I prevent CreateProcess()
from creating a cmd.exe window when using javaw and
Runtime.exec()? No such cmd.exe window is created if
instead I run "java" from the command line.
I have a C++ server named "foo", and have created
a Java applcation with Swing GUI named "foo.java".
This GUI captures configuration information and
then uses Runtime.exec() to start the C++ app, with
a socket established between the Java app and C++
app for later communication.
This is all working fine, and the Java application
and GUI working as expected. When I run "java foo"
from either the NT command shell (cmd.exe) or MKS
Korn shell (sh.exe) the Java application/GUI starts,
and when it calls Runtime.exec() my C++ process is
started as what appears to be a child process of the
"java" process, that is, no cmd.exe window is created
during the Runtime.exec("foo.exe") call.
However, when running the same Java application from
a shortcut on the desktop via "javaw", when I invoke
Runtime.exec() a cmd.exe window is created before my
C++ server is started. While things are running
ok and my Java app can still communicate with my
C++ server, is there anyway I can prevent this
cmd.exe window from being created, and instead, have
my C++ server run as a child process of javaw (or
an independent process without a cmd.exe)?

cmd always opens a dos window - use another console interpreter instead or just call the programm directly.
i.e.
Runetime.exec("c:\\myprogram.exe");
OR
The following demonstrates executing a command without bringing up a popup. import java.io.*;
public class Test {
public static void main (String args[]) throws IOException {
    String[] command = {
      "C:\\winnt\\system32\\cmd.exe", "/y", "/c",
      "dir"};
    Process p = Runtime.getRuntime().exec(command);
    InputStream is = p.getInputStream();
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br = new BufferedReader(isr);
    String line;
    while ((line = br.readLine()) != null) {
      System.out.println(line);
}However....
According to bug number 4244515 in Sun's Bug Parade (http://developer.java.sun.com/developer/bugParade/bugs/4244515.html), javaw doesn't always work without bringing up new window.

Executing a runtime.exec statement from an ejb

Similar Messages

Maybe you are looking for