Using Runtime.exec() on Unix (AIX)

I am attempting to use exec() on the server side to move files to a a windows share via Samba. I'm getting 2 resutls:
If I run the code with exec(string) the server/share infrormation is not passed and Samba attempts to connect to ' '. I'd imagine this is the string being broken down by the StringTokenizer, it seeing the space and splitting the command. Is there a way to escape a space in StringTokenizer?
If I run the code with exec(array[]) the executable is not even found, though it is above, which is confusing.
I've also tried running with exec(string/array, null, <a good working dir>) with the exact same results on both.
I have also tried to run array b below like this using sh:
String[] b = new String[] {"/bin/sh", "-c", cmd};
Process pr = rt.exec(b);
String cmd = "/usr/bin/smbclient \'\\\\nwfiles\\ISGData\' -U \'mi/username%pasword\' -d3 -c \'prompt off;cd \"IVOps\\SWAPS\\Calypso\\Reports\";lcd /opt/calypso/ftp/reports/; put UG5R1DRV120.TST;exit;\'";
File wd = new File("/opt/calypso/ftp/reports");
try {
   Process pr = rt.exec(cmd,null,wd);
   // Get any output
   InputStream in = pr.getInputStream();
   InputStreamReader inR = new InputStreamReader(in);
   BufferedReader buf = new BufferedReader(inR);
   String line;
   while ((line = buf.readLine())!= null) {
             Log.error(this,"OUT MSG: " + line) ;
   // Get any errors
   InputStream inErr = pr.getErrorStream();
   InputStreamReader inRErr = new InputStreamReader(inErr);
   BufferedReader bufErr = new BufferedReader(inRErr);
   String lineErr;
   while ((lineErr = bufErr.readLine())!= null) {
        Log.error(this,"ERR MSG: " + lineErr) ;
} catch(Exception e) {
   Log.error(this,e.toString());
}Edited by: kewlguy53403 on Jan 21, 2009 10:02 PM
Edited by: kewlguy53403 on Jan 21, 2009 10:08 PM

I believe that you are out of luck if you need spaces.
I know for sure that that is true for exec(string). It parses the string whether you want it to or not. No way to stop it.
There is a thread that discusses that somewhere, where someone looked through the VM source to determine what was going on.
I think that a bug should have been opened on that but I can't recall if it happened now.
A possible solution - use a script file. It has the commands. And then java runs that.

Similar Messages

PATH Setting using Runtime.exec() on a UNIX env?

Hi,
How do we set the PATH using Runtime.exec() on a UNIX Env?
I've tried the 'export' command and 'setenv' command but it throws an exception saying 'export' and 'setenv' not found.
objProcess = Runtime.getRuntime().exec("setenv PATH /opt/ibm/java2-x86_64-50/bin");+
Please suggest.
Thanks,
Tanu

Your experimenting with the stuff could shed light on the question, whether the outcome is influenced by the relying of the started process on elements of the starting environment other than PATH.
String[] envp=new String[1];
envp[0]="PATH=/jdk1.5/bin";
Runtime rt=Runtime.getRuntime();
Process proc=rt.exec("java Test",envp);

Runtime.exec() on Unix with "grep"

Hi does someone know how to execute a Unix command which is a ps result piped to grep. What I have runs perfectly for a simple ps like ps -aux runMyCommand, but not for something like ps -aux runMyCommand | grep 8080. I am using Runtime.exec() method.
Please help.
Thanks,

the pipe is handled by the shell, so you cannot just do a runtime.exec("ps aux | grep 8080"), you could try something like this;
String cmd = "sh -c 'ps aux | grep 8080' ";
Runtime.exec(cmd);
or even
String cmd = "sh -c 'ps aux | grep 8080 | grep -v grep'";

How to capture output of java files using Runtime.exec

Hi guys,
I'm trying to capture output of java files using Runtime.exec but I don't know how. I keep receiving error message "java.lang.NoClassDefFoundError:" but I don't know how to :(
import java.io.*;
public class CmdExec {
public CmdExec() {
public static void main(String argv[]){
     try {
     String line;
     Runtime rt = Runtime.getRuntime();
     String[] cmd = new String[2];
     cmd[0] = "javac";
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     proc = rt.exec(cmd);
     //BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
     BufferedReader input = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
     while ((line = input.readLine()) != null) {
        System.out.println(line);
     input.close();
    catch (Exception err) {
     err.printStackTrace();
public class E {
    public static void main(String[] args) {
        System.out.println("hello world!!!!");
}Please help :)

Javapedia: Classpath
How Classes are Found
Setting the class path (Windows)
Setting the class path (Solaris/Linux)
Understanding the Java ClassLoader
java -cp .;<any other directories or jars> YourClassNameYou get a NoClassDefFoundError message because the JVM (Java Virtual Machine) can't find your class. The way to remedy this is to ensure that your class is included in the classpath. The example assumes that you are in the same directory as the class you're trying to run.
javac -classpath .;<any additional jar files or directories> YourClassName.javaYou get a "cannot resolve symbol" message because the compiler can't find your class. The way to remedy this is to ensure that your class is included in the classpath. The example assumes that you are in the same directory as the class you're trying to run.

Parameter to shell script using Runtime.exec(string)

Hi all, ( Speciall hi to dheeraj tak )
Briefly : How do i pass an arguement to a non - java executible being called using Runtime.exec.
In detail : i am using Runtime.exec to call a shell script : The code is as follows:
String callAndArgs[] = {"/home/tom/jakarta-tomcat-4.1.24/webapps/dash/script.sh"};
try {
Runtime rt = Runtime.getRuntime();
Process child = rt.exec(callAndArgs);
This works properly & calls the shell script which in turn invokes some other executible (c file).
$HOME/midi/test/build/bin/<C-EXECUTIBLE>
Here i am specifying the name (say hello.exe ) . So far so good.
I want to make this happen dynamiclaly. so i need to pass the name of the executible as a parameter to the script.
To pass a parameter i hav to change the string to :-
String callAndArgs[] = {"/home/tom/jakarta-tomcat-4.1.24/webapps/dash/script.sh <C-EXECUTIBLE HERE>"};
and the script to
$HOME/midi/test/build/bin/$1 --- where $1 refers to argument 1. (C-EXECUTIBLE AGAIN).
This is giving an IO - Execption. Plz help
Code will be very helpful.
Thanx in advance

some 1 plz tell me the difference :-
This is the documentation of Runtime.exec that i found :-
1> exec
public Process exec(String command) throws IOException
Executes the specified string command in a separate process.
The command argument is parsed into tokens and then executed as a command in a separate process. This method has exactly the same effect as exec(command, null).
Parameters:
command - a specified system command
Complete refernce says : Process (String progName) ----- Executes a program specified by programname as a seperate process.
2> exec
public Process exec(String cmdarray[]) throws IOException
Executes the specified command and arguments in a separate process.
The command specified by the tokens in cmdarray is executed as a command in a separate process. This has exactly the same effect as exec(cmdarray, null).
Parameters:
cmdarray - array containing the command to call and its arguments.
Complete reference says : Process exec(String comLineArray[]) ---- Executes the command line specified bythe string in comLineArray as a seperate process.
This means that there is provision 4 command line arguments...
how do u use it then????????????????????????????

How to run db2 command by using Runtime exec

Hello
I am using java. When i am runing db2 command by using Runtime.exec( String cmd, String[] env ). I gave the environment path
DB2CLP=6259901
DB2DRIVER=D:\ibm\db2\java\db2java.zip
DB2HOME=D:\ibm\db2
DB2INSTANCE=DB2
DB2MMTOP=D:\CMBISS
but still I am getting error message
"DB21061E Command line environment not initialized"
after setting the above path in the cmd It is working fine. When i am trying thro java programm i am getting the above error. Can I get answer for this.
bhaski.

Before you can execute DB2 commands you have to open a DB2 CLP. The following code will do so:
import java.io.IOException;
public class Db2 {
     public static void main(String args[]) {
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               Process child = rt.exec("db2cmd");
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          catch (IOException io) {
               io.printStackTrace();
          catch (InterruptedException e) {
               e.printStackTrace();

Can we run a java application using Runtime.exec()?

Can we run a java application using Runtime.exec()?
If yes what should i use "java" or "javaw", and which way?
r.exec("java","xyz.class");

The best way to run the java application would be to dynamiically load it within the same JVM. Look thru the class "ClassLoader" and the "Class", "Method" etc...clases.
The problem with exec is that it starts another JVM and moreover you dont have the interface where you can throw the Output directly.(indirectly it can be done by openong InputStreams bala blah............). I found this convenient. I am attaching part of my code for easy refernce.
HIH
ClassLoader cl = null;
Class c = null;
Class cArr[] ;
Method md = null;
Object mArr[];
cl = ClassLoader.getSystemClassLoader();
try{
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} catch(ClassNotFoundException e) {
System.out.println(e);
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     System.out.println(e);
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try {
processedPkt = md.invoke( null, mArr) ;
} catch(IllegalAccessException e) {
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} catch(IllegalArgumentException e) {
          System.out.println(e);
}catch(InvocationTargetException e) {
          System.out.println(e);
}catch(NullPointerException e) {
          System.out.println(e);
}catch(ExceptionInInitializerError e) {
          System.out.println(e);
}

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(
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            InputStream error = new InputStreamr(process.getErrorStream());
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            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();
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Using runtime.exec,process streams

Hi all,
I am using runtime.exec to execute a batch file(rmdir /s/q directoryname) which deletes all the files in a certain directory(including subdirectories). However, some of the files are not deleted since they are being used by other processes.
I have closed all file references but still the batch file says they are being used by other processes. The File.canWrite() method however, returns true for all the files. I have also tried to delete the files using file.delete but it does not work.
So I have 2 questions.
1. Can I forcibly delete these files some other way.
2. If i call a batch file to delete the files and it fails on some files, the command window displays "cannot delete files". How can I write out thse messages into a text file which i can use as a log file.Do I have to use Process.getInputstream()/Process.getInputstream() ? If so, how?
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Vinny

I tried the following before but the string i get is always empty, but i can see there are messages in the command window. Please let me now if i am doing something wrong.
try{
Process p = rt.exec("cmd.exe /c start deletefiles.bat");
InputStream ins = p.getInputStream();
byte[] bytearray = new byte[1024];
int bytecount;
String dos_string="";
BufferedInputStream bis = new BufferedInputStream(ins);
while ((bytecount = bis.read(bytearray, 0, 1024)) > -1) {
String str = new String(bytearray,0,bytecount);
dos_string += str;
System.out.println("dos string is" +dos_string);
catch (Exception e) {
System.out.println("Error: " + e);

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

Using runtime.exec to zip some files

Hi,
I am using runtime.exec to try to automatically zip a bunch of files on a server. However, it does not seem to be working.
Before I execute the command, I save the zip command in a string. I then print the string to a log file, and then execute the runtime zip command. But nothing happens.
Yet, when I copy the string from the log, and paste it in a terminal, it properly creates the zip files. So, I know I have the correct command string, it just does not seem to be working within the java application. Also, the command string uses fully qualified directories, so it is not a directory issue.
I am using ubuntu linux.
Any ideas?
-Adam

adamSpline wrote:
Hi,
I am using runtime.exec to try to automatically zip a bunch of files on a server. However, it does not seem to be working.
Before I execute the command, I save the zip command in a string. I then print the string to a log file, and then execute the runtime zip command. But nothing happens. Within Runtime.exec() any command does not run in a shell and I bet you use wild cards and/or other commands to be interpreted by a shell which will not be interpreted since there is no shell. And, since you don't mention error messages or the return code, I will also bet you don't process the Process stdout , stderr and the return code properly.
It looks to me like you have fallen for at least two for the traps in [http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html|http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html].
>
Yet, when I copy the string from the log, and paste it in a terminal, it properly creates the zip files. So, I know I have the correct command string, it just does not seem to be working within the java application. Also, the command string uses fully qualified directories, so it is not a directory issue.
I am using ubuntu linux.
Any ideas?I agree with 'masijade' - use the built in Java classes.
>
-Adam

Using Runtime exec() to open java on other directory

HI, I have a little problem and i hope everyone can help me out abit. You see when u use Runtime.exec(), how to you use it so that when the file you want to open is different from your program directory.
For example,
my program is in c:\windows\desktop
but the file i want to open eg. Somthing.class is in c:\my documents\
How do I open it using java and i wish to open the file using the java command. Thank a million

Runtime.getRuntime().exec("cmd /c start /d\"C:\\my documents\" java.exe Somthing");
Can someone explain the /c start /d\"C:\Mydocuments\" java.exe Somthing.
And I try to use ping in RunTime.exec,how do I construct the string?And how do i get the result of the ping?
Thanks

Issue using Runtime.exec() in Vista

I've coded a simple method using Runtime.exec() to get the client MAC ID , and it worked alright on XP. Now my client want to switch to vista , and the method is not working. Here's my code
import java.io.*;
import java.util.regex.*;
public class GetMac
     public static String getMacAddress()
          String mac="";
          System.out.println("getMacAddress");
          try {
               RunTimeExecutor re=new RunTimeExecutor("ipconfig /all");
                mac=re.executeAndReturnMac();
                re.destroy();
          } catch (Exception e) {
               e.printStackTrace();
          return mac;
import java.io.IOException;
import java.io.InputStream;
* @author amal
public class RunTimeExecutor
          String cmd;
          Process proc;
           * @param cmd
          public RunTimeExecutor(String cmd)
                    this.cmd=cmd;
           * @return boolean
           * @throws WIException
          public String executeAndReturnMac() throws Exception
               System.out.println("run");
               String mac="";
                    if(cmd==null)
                              throw new Exception("No Commands");
                    try
                          final Runtime rt = Runtime.getRuntime();
                          proc = rt.exec(cmd);
                          final StreamGobbler errorGobbler = new StreamGobbler(proc.getErrorStream());
                          InputStream iis=proc.getInputStream();
                          final StreamGobbler outputGobbler = new StreamGobbler(iis);
                          errorGobbler.start();
                          outputGobbler.start();
                          int exit=proc.waitFor();
                          System.out.println("exitVAl "+exit);
                          if(exit==0)
                               mac=outputGobbler.MAC;
                          return (exit==0) ? mac :null;
                catch (IOException e)
                          e.printStackTrace();
                catch (InterruptedException e)
                          e.printStackTrace();
                catch(Exception e)
                     e.printStackTrace();
                return null;
          public void destroy()
                    if(proc!=null )
                              proc.destroy();
* @author amal
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
* @author amal
public class StreamGobbler extends Thread
    InputStream is;
    OutputStream os;
    public String MAC;
    StreamGobbler(InputStream is)
        this(is,null);
    StreamGobbler(InputStream is,OutputStream redirectTo)
        this.is = is;
        this.os = redirectTo;
     * @see java.lang.Thread#run()
    public void run()
        try
            PrintWriter pw = null;
            if (os != null)
                pw = new PrintWriter(os);
            InputStreamReader isr = new InputStreamReader(is);
            int c=0;
            BufferedReader br = new BufferedReader(isr);
            String line=null;
System.out.println("Start Reading");
                 while ( (line = br.readLine()) != null)
                      System.out.println(line);
                     if (pw != null)
                         pw.println(line);
                     Pattern p = Pattern.compile(".*Physical Address.*: (.*)");
                        Matcher m = p.matcher(line);
                        if (m.matches())
                             MAC = m.group(1);
                             System.out.println("seting MAC to "+MAC);
                             break;
            if (pw != null)
                pw.flush();
        } catch (Exception e)
            e.printStackTrace();
}The inputStream of the process doesnt get printed at all , the loop condition in StreamGobbler 'while ( (line = br.readLine()) != null)
' is never true.
Also , in random cases i've seen the System.out.println("exitVAl "+exit); line executing before the System.out.println("Start Reading"); line , and i though proc.waitFor() would guarentee otherwise.

thx guys for ur replies . The issue was because of some browser security system ( or so they said . ).However i'm still puzzled about the 'waiting for the stream to finish' part .
paul.miner wrote:
{I think the process is allowed to end with output still in the >>buffers, ..so this would be expected. You should be waiting for >>your .streams to finish, since that's what you really >>care .about. .Also, .you need to add synchronization between your >>threads so you can accurately retrieve "MAC". Also, do not break out >>of the loop when you find what you're looking for, you should >>continue .reading until the end of the stream.Wasn't I suppose to be reading out of the stream to prevent an overflow?Also the break is done there are multiple lines like 'Physical address .....: xxxxxxxxxx ' in the output , and the macid is the first one.About the ProcessBuilder , I'll look into it . Thx for your advice.

How to copy .gif files from one dir to another using runtime.exec

hello sir/madem,
i want to copy some gif and jepg files from one directory to another dir using swing.
when i tried with using runtime.exec(String[]) i am getting the following error.
anybody please tell me what is the problem in my program
java.io.IOException: CreateProcess: ren c:/windows/desktop/copy.java c:/windows/
cc.java error=0
code:
public class copy
     public static void main(String[] args)
          try{
               String s[]=new String[3];
                    s[0]="ren";
s[1]="c:/windows/desktop/copy.java";
s[2]="c:/windows/cc.java";
          Runtime rt=Runtime.getRuntime();
Process p=rt.exec(s);
          int i=p.waitFor();
          System.out.println("i is "+i);
          }catch(Exception e){System.out.println(e);}
please mail me to [email protected]
thanks in advance
samba reddy
india

why use the Runtime? There are methods for this in the IO package ...

Launching another VM instance using Runtime.exec()

Hi,
I have two separate Swing applications, say A and B. I need to launch B from A using Runtime.exec() - essentially I am launching another VM instance from one VM. I am encountering strange problems - B's main window comes up, but GUI doesn't update; sometimes B comes up and GUI updates, but huge memory leaks happen. All the problems with B go away once A is shut down. It almost looks like both the instances of VM are sharing (or competing for) the event thread. Any comments will be of great help. Thanks.
note: There is no problem launching B if A is a console java application (i.e. no Swing GUI).

I have recently had the same problem, especially with the part where it seems like the two applications are sharing or competing for the same event thread. Sometimes my application B hangs like it is stuck waiting for an event. Sometimes I can get it to unhang by moving the app window around or minimizing it. If it does break free, all the queued events occur in rapid succession. Anybody have any clue what's going on here? It's pretty annoying.

Using Runtime.exec() on Unix (AIX)

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