Runtime.exec(bat file) : doesn't display stdio

Hello, I need to start bat files from my Java Application
to do this, I use
Runtime.getRuntime().exec("my_bat.bat");
a Dos console is opened.
if my_bat.bat
starts notepad.exe ==> it works
if my_bat.bat
does echo hello world ==> nothing is displayed.
I would like the STDOUT procuded by the .bat file to be
displayed in the console.
Anyone can help me?
Regards.

You need to get the input stream from the process, and print out what it sends. Simply calling "waitFor()" will wait forever, since the stdout characters need to be read.
Try this :
InputStream st = Runtime.getRuntime().exec("hello_world.bat").getInputStream();
int n;
while ((n = st.read()) >= 0) {
System.out((char)n);
}Walter Gildersleeve
Productivity Engineering, GmbH
Freiburg, Germany

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Runtime.exec() batch file problem

Hi folks,
i have a little problem when I want to execute a batch file through java's runtime.exec() method.
the execution of a very simple batchfile works (for example opening notepad or other stuff), but I have problems with the following batch file (although it's still simple):
net use s: \\Dd-nt-fs\Dsmp15_files
set DSCFG=c:\dscfg
set PSPATH=c:\adproof
set ora_path=C:\oracle\ora92
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set PSPATH=c:\adproof
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s:
cd S:\Dsmp_Q4_2004\bin
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my guess is that there is a problem with the setting of environment variables which correspond to the drive s:
I mannually added the batchfile (line by line) and looked whether it got through to the command which executes the adproof.exe file: for example the below batchfile worked:
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set PSPATH=c:\adproof
set ora_path=C:\oracle\ora92
s:
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S:\Dsmp_Q4_2004\Dsmp_Reports\Telenor\adproof.exe DBUSER=a_user DBPSWD=a_pswd DBSTR=dbstr ADINFO=adinfo.lst TASKID=a_taskid
Here is the java code: in which i execute the batch file:
Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("net use s: \\\\Dd-nt-fs\\DSMP15_FILES");
BufferedReader b = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
while( (line=b.readLine())!=null) {
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int exitVal = proc.waitFor();
System.out.println("Exit Value = " + exitVal);
String[] cmd = new String[1];
cmd[0] = "C:\\Documents and Settings\\tikmi\\My Documents\\mysources\\DSMP Prototype\\print\\hallo3.bat";
// here i declared the needed settings of the environment variable and pass that array to the exec() method
String[] env = new String[8];
env[0] = "DSCFG=c:\\dscfg";
env[1] = "ORA_PATH=C:\\oracle\\ora92";
env[2] = "PSPATH=C:\\Documents and Settings\\tikmi\\My Documents\\mysources\\DSMP Prototype\\print";
env[3] = "ND_FONT=S:\\Dsmp_Q4_2004\\Fonts";
env[4] = "nxPS_FONT_DIR=%ND_FONT%";
env[5] = "PSFORMS=S:\\Dsmp_Q4_2004\\PsForms\\Telenor";
env[6] = "ND_PATH=S:\\Dsmp_Q4_2004\\resource";
env[7] = "PATH=S:\\Dsmp_Q4_2004\\Bin;%ORA_PATH%\\BIN;%ND_PATH%;%PATH%;";
rt = Runtime.getRuntime();
proc = rt.exec(cmd, env);
b = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
while( (line=b.readLine())!=null) {
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exitVal = proc.waitFor();
System.out.println("Exit Value = " + exitVal);Maybe someone else had similar problems or can help me solving that problem.
Any advice would be very appreciated.
regards
mirkolino

finally I got it working now.
for those who are interested in the problem, my code that's now working is the following
Runtime rt = Runtime.getRuntime();
                        Process proc = null;
                        String cmd = "cmd.exe /c c:\\adproof\\hallo3.bat";
                        proc = rt.exec(cmd);
                        InputStream in = proc.getInputStream();
                        BufferedReader br = new BufferedReader ( new InputStreamReader(in));
                        String line;
                        while( (line=br.readLine()) != null) {
                            System.out.println(line);
                        int exit = proc.waitFor();
                        System.out.println();
                        System.out.println("Process exited with: " + exit);the problem was, that i have to handle and read the input stream
thanks for you help
greetings from mirkolino

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This is the first time I've used Runtime.exec();
Here's the code:
Runtime rt = Runtime.getRuntime();
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Welcome to the forum!
>
as you can see, this is just copied and pasted out of the standard example for this method.
>
No one can see that - you didn't post a link to the example you said you copied.
>
it doesn't read anything. However, when i run the SAME exact command from the windows CMD prompt i get a ton of output.
>
No one can see what command you are talking about; you didn't post the commnd or even describe what output you expect to get.
>
what am i doing wrong here?
>
What you are doing wrong is not providing the code you are using, the command you are using or enough information about what exactly you are doing.
No one can try to reproduce your problem based on what you posted.

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Hey,
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now try it
you should get
D:\Temp\telnet' is not recognized as an internal or external command,
operable program or batch file.
as an output
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public class Main{
public static void main(String[] args)
    String[] command = new String[3];
    command[0] = "cmd.exe";
    command[1] = "/C";
    command[2] = "D:\\Temp\\telnet\telnet.exe";
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                                               (p.getInputStream()));
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Runtime.exec(bat file) : doesn't display stdio

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