Runtime.exec(): VM creates batch executions???

I wrote an application that performs a task within a loop. Therefore i setup up a prograssbar in my GUI. during testing, the progressbar showed nice progress by just perforing a Thread.sleep() as the task. Then i replace the Thread.sleep() with the real task that is execution of a system command:
                    Runtime rt = Runtime.getRuntime();
                    process = rt.exec(command);
                    exitCode = process.waitFor(); //wait until system command returnsand suddenly the progressbar doesn't proceed but pops up at the and of the complete loop. First i thought it is a refresh problem of the progressbar, but after i insertet System.out, these System.outs within the loop also only get printed (all but the very first) at the end of the loop. Toggling between the execution tasks "Thread.sleep" and "Runtime.exec" also toggles "nice progress output" and "output all at the end of the loop".
I wonder why this happens?

At least, i can workaround this because my system command throwed an IOException. With the correct command, it worked. But the effect still occurs, because I added a System.out in the catch clause and when using the wrong command (that cause the IOException), even those System.outs were printed in a batch way (all at wants) after all tasks finsihed. System.out.flush() didn't make any difference.

Similar Messages

Strange behavior when using Runtime.exec() to run batch file

I've been struggling with this for hours.
I have a Swing application which upon clicking a button, I want to execute a batch file. This batch file itself uses a command window.
When I use
Runtime load = Runtime.getRuntime();
load.exec("cmd /c start c:\\renew\\renew2\\bin\\win\\renew.bat");
The program (Renew) will start up no problem, but when I exit Renew, the command window stays put. I want the command window to close. Running Renew stand-alone, upon closing Renew, it will exit the command window.
When I use
Runtime load = Runtime.getRuntime();
load.exec("cmd /c c:\\renew\\renew2\\bin\\win\\renew.bat");
or
Runtime load = Runtime.getRuntime();
load.exec("c:\\renew\\renew2\\bin\\win\\renew.bat");
When I press the button, sometimes the Renew application will come up right away, sometimes the Renew application will come up after a very long delay, and most times, the Renew application will only come up after I have closed the Swing frame where the button is located. When I use this code, the command window that Renew uses is never visible.
What I want is to simply have the Renew application behave the same exact way launching from my Swing application as when Renew is being run standalone.
Any suggestions? Thanks so much.
Sincerely,
Will

Getting rid of start makes the startup time very variable. Sometimes it starts up right away, sometimes after many minutes, most times only after I close my application.
Thanks, Any other suggestions?
(BTW, I have read the famous "When Runtime.exec() won't" article, and have tried its suggestions to no avail)
Message was edited by:
willies777

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.

Backgrounding Runtime.exec

Is there a way to background a Runtime.exec() call to a batch file? What I want to do is right after the batch file is executed I want to exit java and keep the .bat process running in the background. I am creating a process that lets the user upgrade a local JVM in the directory. But you can't necessarily do that from java. So I have a .bat file that extracts the necessary files. Any suggestions on how to background that?

Hmmm as far as i know the Process created by Runtime.getRuntime.exec(String ex), runs independantly of the creator. And that is also what i get from reading the Process API, espacially this part "The subprocess is not killed when there are no more references to the Process object, but rather the subprocess continues executing asynchronously":
API BEGIN
The Runtime.exec methods create a native process and return an instance of a subclass of Process that can be used to control the process and obtain information about it. The class Process provides methods for performing input from the process, performing output to the process, waiting for the process to complete, checking the exit status of the process, and destroying (killing) the process.
The Runtime.exec methods may not work well for special processes on certain native platforms, such as native windowing processes, daemon processes, Win16/DOS processes on Microsoft Windows, or shell scripts. The created subprocess does not have its own terminal or console. All its standard io (i.e. stdin, stdout, stderr) operations will be redirected to the parent process through three streams (Process.getOutputStream(), Process.getInputStream(), Process.getErrorStream()). The parent process uses these streams to feed input to and get output from the subprocess. Because some native platforms only provide limited buffer size for standard input and output streams, failure to promptly write the input stream or read the output stream of the subprocess may cause the subprocess to block, and even deadlock.
The subprocess is not killed when there are no more references to the Process object, but rather the subprocess continues executing asynchronously.
There is no requirement that a process represented by a Process object execute asynchronously or concurrently with respect to the Java process that owns the Process object.
API END
Poul Krogh

Running interactive command with Runtime.exec

I'm trying to run a command via the Runtime.exec interface.
Occasionally, the command needs to prompt for additional information. The response depends on the specific configuration, however, the command returns a list of options and then waits for a response.
However, when the command waits for the response, my Java app hangs.
After I call Runtime.exec, I create 2 threads to consume the contents of stderr and stdout. I then start them and call proc.waitFor()
I would expect to see the output of the command in the stdout stream even though the command hasn't exited. I had hoped to parse the output to determine the necessary response. However, the calls to read the contents of the stdout and stderr streams block and I never see any output.
How can I get access to the contents of those streams while the command is still running? Is this supported through the Runtime.exec interface?
Thanks,
Shawn

This article should help:
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

Runtime.exec() and Mozilla

Hi all. I'm not sure if this is the correct forum for this question but I use Runtime.exec() to create a new mozilla process. I have no problem creating the process itself but I need to have a way to communicate with the process to determine whether or not a local file has been successfully loaded into the browser. I programmatically load some html content in mozilla and I need to get the current "state" of the browser (i.e. is the content fully loaded and displayed on the screen or is mozilla still busy loading the html file?). I figure that the only way to determine this state is to get the Processes input stream and to read data from that stream but I don't know if mozilla writes data to it's output stream that indicates what state the application is in. Does anybody have a solution to this problem (Whether using streams or some other approach)? Thanks in advance.

It may be possible to hack Mozilla to get that sort of information, although most likely its security is good enough to prevent attacks of that kind. But in any case Runtime.exec() isn't going to help.

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
set path=S:\Dsmp_Q4_2004\Bin;%ora_path%\bin;%path%;
set nd_font=S:\Dsmp_Q4_2004\Fonts
set nxPS_FONT_DIR=%ND_FONT%
set PSPATH=c:\adproof
set PSFORMS=S:\Dsmp_Q4_2004\PsForms\Telenor
s:
cd S:\Dsmp_Q4_2004\bin
S:\Dsmp_Q4_2004\Dsmp_Reports\Telenor\adproof.exe DBUSER=a_user DBPSWD=a_pswd DBSTR=dbstr ADINFO=adinfo.lst TASKID=a_taskid
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:
set DSCFG=c:\dscfg
set PSPATH=c:\adproof
set ora_path=C:\oracle\ora92
s:
cd S:\Dsmp_Q4_2004\bin
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) {
      System.out.println(line);
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) {
          System.out.println(line);
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

Environment of process created by Runtime.exec()

Can anyone describe the interactions of the process environment created by Runtime.exec()?
For example, if Runtime.exec() is used as follows:
Runtime.exec("cmd /K somebatfile");
Is the environment preserved throughout the execution of somebatfile?
Rather, if the classpath, working directory, etc. is changed within "somebatfile" are those changes still preserved by the cmd shell if it is executed this way from Runtime?

That is the way I thought things worked. Thanx.
However, when I start my command script inside of a shell (with "cmd /K") I get a "file not found" error. The command generating the error is a java call loading a executable jar which uses jni to open sockets and I have no Idea what else. (I know about the sockets because of the failed socket messages that are generated after the file not found error). The source code for the launched application is not available.
If you can provide some other insight I would appreciate it.

Runtime.exec() and batch files

I am having a problem on Windows 2000 while trying to execute a batch file with the Runtime.exec() method. Basically, the exit value returned from the call to Runtime.exec(), returned specifically by the waitFor() method in the Process class, is always zero, even if the batch file fails miserably. After looking into batch files further, it seems to me that the only way to get the exit value of the commands run in the batch file back to the Runtime.exec() call is to put "EXIT %ERRORLEVEL%" in the batch file. What this actually does is exit the command(cmd) shell that the batch file was running in with the exit code of the last command run. This is all great when calling the batch file with a Runtime.exec() call, but when you run it in a cmd window, the window closes when the batch file completes, because the call to EXIT exits the entire shell. I guess i'm just wondering, am i correct in assuming the exit value returned to the java process is going to be the exit value of the shell in which the batch file is running? I need to have the exit value actually indicate whether the batch file ran successfully or not, and if i have to put in the EXIT %ERRORLEVE% (which exits the cmd shell with the exit value of the last command run), then i'll do that, but if someone knows a better way of doing this, i am all ears. Thanks in advance

To run any command from java code, the method is
Runtime.getRuntime().exec( myCommandString )
Where, myCommandString is something like "/full/pathname/command".
If the pathname contains spaces (specifically in Windows), e.g. "c:\program files\windows\notepad", then enclose it in quotes within the quoted string. Or pre-tokenize them into elements of an array and call exec(String[] cmd) instead of exec(String cmd).
From JDK1.3 there are two new overloaded Runtime.exec() methods. These allow you to specify starting directory for the child process.
Note, there is a gotcha associated with reading output from commands. When the runtime exec's the process, it passes to it 3 streams, for stdin, stdout, and stderr; the out and err are buffered but the buffer size isn't very big. When your process runs, it reads (if needed) from in, and writes to out and err.
If it doesn't write more than the buffer-size, it can run to completion.
But if it tries to write more data to one or the other stream than the buffer can hold, the write blocks, and your process hangs, waiting for you to empty the buffer so it can write some more.
So after the exec call, get the streams, and read from them in a loop until they both hit end-of-stream (don't block on either one, just read whatever is available from each, each loop iteration).
Then when the streams have ended, call the process.waitFor() method to let it finish dying.
Now, here is a code snippet how you achieve this.
String strCommand = "cmd.exe /c " + strCommand;
// For Solaris / unix it will be
// String strCommand = "/usr/cobra/sol/runInstaller.sh";
boolean bWait = true;
//execute the command
try
     Runtime r = Runtime.getRuntime();
     Process pr = r.exec(strCommand);
     Process pr = r.exec(callAndArgs);
     BufferedInputStream bis =new BufferedInputStream(pr.getInputStream ());
     int c=0;
     /** Outlet for IO for the process **/
     while (c!=-1)
          c=bis.read();
     /**Now wait for the process to get finished **/
     if(bWait == true)
          pr.waitFor();
          pr.destroy();
catch(Exception e)
     System.out.println("Could not execute process " + strCommand);
     return(false);

Runtime.exec opening dos shell

I am using runtime.exec() to execute the net use command (to get connected two machines). It is working fine, but exec() opening a new dos command window till it finishes its job.
Is there any way to avoid this opening a dos shell and get the job done.I don't mind even If I can minimize this window instead of closing it.

This is one of those common questions that keeps occuring.
Basically it's a Windows/DOS problem not Java.
Have a look at the "start" command in Windows.
runtime.exec ("start /MIN mycommand.bat")
will minimise your command window on execution.
There's also a more promising /b parameter
runtime.exec ("start /B mycommand.bat")
which claims to avoid creating a window.
However, if you're kicking off a native Windows program that explicitly
creates it's windows then you should probably also look at it's parameters to see if there's a quiet/silent/batch mode which avoids creating the Windows.

How can I run Runtime.exec command in Java To invoke several other javas?

Dear Friends:
I met a problem when I want to use a Java program to run other java processes by Runtime.exec command,
How can I run Runtime.exec command in Java To invoke several other java processes??
see code below,
I want to use HelloHappyCall to call both HappyHoliday.java and HellowWorld.java,
[1]. main program,
package abc;
import java.util.*;
import java.io.*;
class HelloHappyCall
     public static void main(String[] args){
          try
               Runtime.getRuntime().exec("java -version");
               Runtime.getRuntime().exec("cmd /c java HelloWorld "); // here start will create a new process..
               System.out.println("Never mind abt the bach file execution...");
          catch(Exception ex)
               System.out.println("Exception occured: " + ex);
} [2]. sub 1 program
package abc;
import java.util.*;
import java.io.*;
class HelloWorld
     public static void main(String[] args){
     System.out.println("Hellow World");
} [3]. Sub 2 program:
package abc;
import java.util.*;
import java.io.*;
class HappyHoliday
     public static void main(String[] args){
     System.out.println("Happy Holiday!!");
} When I run, I got following:
Never mind abt the bach file execution...
I cannot see both Java version and Hellow World print, what is wrong??
I use eclipse3.2
Thanks a lot..

sunnymanman wrote:
Thanks,
But How can I see both programs printout
"Happy Holiday"
and
"Hello World"
??First of all, you're not even calling the Happy Holiday one. If you want it to do something, you have to invoke it.
And by the way, in your comments, you mention that in one case, a new process is created. Actually, new processes are created each time you call Runtime.exec.
Anyway, if you want the output from the processes, you read it using getInputStream from the Process class. In fact, you really should read that stream anyway (read that URL I sent you to find out why).
If you want to print that output to the screen, then do so as you'd print anything to the screen.
in notepad HelloWorld.java, I can see it is opened,
but in Java, not.I have no idea what you're saying here. It's not relevant whether a source code file is opened in Notepad, when running a program.

Runtime.exec() fails sometime to execute a command

Hello,
I have a program thats using Runtime.exec to execute some external programs sequence with some redirection operators.
For e.g, I have some command as follows;
1 - C:\bin\IBRSD.exe IBRSD -s
2 - C:\bin\mcstat -n @punduk444:5000#mc -l c:\ | grep -i running | grep -v grep |wc -l
3 - ping punduk444 | grep "100%" | wc -l
...etc.
These command in sequence for a single run. The test program makes multiple such runs. So my problem is sometimes the runtime.exec() fails to execute some of the commands above (typically the 2nd one). The waitFor() returns error code (-1). That is if I loop these commands for say 30 runs then in some 1~4 runs the 2nd command fails to execute and return -1 error code.
Can some one help me out to as why this is happening? Any help is appreciated
Thanks,
~jaideep
Herer is the code snippet;
Runtime runtime = Runtime.getRuntime();
//create process object to handle result
Process process = null;
commandToRun = "cmd /c " + command;
process = runtime.exec( commandToRun );
CommandOutputReader cmdError = new CommandOutputReader(process.getErrorStream());
CommandOutputReader cmdOutput = new CommandOutputReader(process.getInputStream());
cmdError.start();
cmdOutput.start();
CheckProcess chkProcess = new CheckProcess(process);
chkProcess.start();
int retValue = process.waitFor();
if(retValue != 0)
return -1;
output = cmdOutput.getOutputData();
cmdError = null;
cmdOutput = null;
chkProcess = null;
/*******************************supporting CommandOutputReader class *********************************/
public class CommandOutputReader extends Thread
private transient InputStream inputStream; //to get output of any command
private transient String output; //output will store command output
protected boolean isDone;
public CommandOutputReader()
super();
output = "";
this.inputStream = null;
public CommandOutputReader(InputStream stream)
super();
output = "";
this.inputStream = stream;
public void setStream(InputStream stream)
this.inputStream = stream;
public String getOutputData()
return output;
public void run()
if(inputStream != null)
final BufferedReader bufferReader = new BufferedReader(new InputStreamReader(inputStream), 1024 * 128);
String line = null;
try
while ( (line = bufferReader.readLine()) != null)
if (ResourceString.getLocale() != null)
Utility.log(Level.DEBUG,line);
//output += line + System.getProperty(Constants.ALL_NEWLINE_GETPROPERTY_PARAM);
output += line + "\r\n";
System.out.println("<< "+ this.getId() + " >>" + output );
System.out.println("<< "+ this.getId() + " >>" + "closed the i/p stream...");
inputStream.close();
bufferReader.close();
catch (IOException objIOException)
if (ResourceString.getLocale() != null)
Utility.log(Level.ERROR, ResourceString.getString("io_exeception_reading_cmd_output")+
objIOException.getMessage());
output = ResourceString.getString("io_exeception_reading_cmd_output");
else
output = "io exeception reading cmd output";
finally {
isDone = true;
public boolean isDone() {
return isDone;
/*******************************supporting CommandOutputReader class *********************************/
/*******************************supporting process controller class *********************************/
public class CheckProcess extends Thread
private transient Process monitoredProcess;
private transient boolean continueLoop ;
private transient long maxWait = Constants.WAIT_PERIOD;
public CheckProcess(Process monitoredProcess)
super();
this.monitoredProcess = monitoredProcess;
continueLoop =true;
public void setMaxWait(final long max)
this.maxWait = max;
public void stopProcess()
continueLoop=false;
public void run()
//long start1 = java.util.Calendar.getInstance().getTimeInMillis();
final long start1 = System.currentTimeMillis();
while (true && continueLoop)
// after maxWait millis, stops monitoredProcess and return
if (System.currentTimeMillis() - start1 > maxWait)
if(monitoredProcess != null)
monitoredProcess.destroy();
//available for garbage collection
// @PMD:REVIEWED:NullAssignment: by jbarde on 9/28/06 7:29 PM
monitoredProcess = null;
return;
try
sleep(1000);
catch (InterruptedException e)
if (ResourceString.getLocale() != null)
Utility.log(Level.ERROR, ResourceString.getString("exception_in_sleep") + e.getLocalizedMessage());
System.out.println(ResourceString.getString("exception_in_sleep") + e.getLocalizedMessage());
else
System.out.println("Exception in sleep" + e.getLocalizedMessage());
if(monitoredProcess != null)
monitoredProcess.destroy();
//available for garbage collection
// @PMD:REVIEWED:NullAssignment: by jbarde on 9/28/06 7:29 PM
monitoredProcess = null;
/*******************************supporting process controller class *********************************/

Hi,
Infact the command passed to the exec() is in the form of a batch file, which contains on of these commands. I can not put all commands in one batch file due to inherent nature of the program.
But my main concern was that, why would it behave like this. If I run the same command for 30 times 1~3 times the same command can not be executed (returns with error code 1, on wiun2k pro) and rest times it works perfectly fine.
Do you see any abnormality in the code.
I ahve used the same sequence of code as in the article suggested by
"masijade". i.e having threads to monitor the process and other threads to read and empty out the input and error streams so that the buffer does not get full.
But I see here the problem is not of process getting hanged, I sense this because my waitFor() returns with error code as 1, had the process hanged it would not have returned , am I making sense?
Regards,
~jaideep

Runtime.exec ignores the working directory argument

Hi Folks,
I need to run a batch file in a particular directory, from a Java program.
Here, I want to run "startMySQL.bat" from the ./bin directory.
I used the following code to do so.
     String commandToExecute = "startMySQL.bat";
     File file = new File("bin");
Process sqlPrcs = Runtime.getRuntime().exec(commandToExecute, null, file);
When I run these lines in a program, I get the following exception:
java.io.IOException: CreateProcess: startMySQL.bat error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Unknown Source)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at com.aperto.ems.packetmax.AuthenticationScreen.startDB(AuthenticationScreen.java:603)
at com.aperto.ems.packetmax.AuthenticationScreen.validateUserAndReinitialize(AuthenticationScreen.java:479)
at com.aperto.ems.packetmax.AuthenticationScreen.access$0(AuthenticationScreen.java:468)
at com.aperto.ems.packetmax.AuthenticationScreen$OnOKButtonPress.actionPerformed(AuthenticationScreen.java:628)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener$ReleasedAction.actionPerformed(Unknown Source)
at javax.swing.SwingUtilities.notifyAction(Unknown Source)
at javax.swing.JComponent.processKeyBinding(Unknown Source)
at javax.swing.JComponent.processKeyBindings(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
"error=2" in Windows mean "not able to find the file".
Any clues on how I can run the batch file from a particular working directory?
Thanks!

Hi,
I changed the code to print the user.dir output and the absolute path of the file. It looks like this:
String commandToExecute = "startMySQL.bat";
File fl = new File("bin");
System.out.println(fl.getAbsolutePath());
System.out.println(System.getProperty("user.dir"));
Process sqlPrcs = Runtime.getRuntime().exec(commandToExecute, null, fl);
Below is the output I get:
C:\Program Files\Aperto\WaveCenter\Back-End_Server_2.0_build8\bin
C:\Program Files\Aperto\WaveCenter\Back-End_Server_2.0_build8
java.io.IOException: CreateProcess: startMySQL.bat error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Unknown Source)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at com.aperto.ems.packetmax.AuthenticationScreen.startDB(AuthenticationScreen.java:604)
at com.aperto.ems.packetmax.AuthenticationScreen.validateUserAndReinitialize(AuthenticationScreen.java:479)
at com.aperto.ems.packetmax.AuthenticationScreen.access$0(AuthenticationScreen.java:468)
at com.aperto.ems.packetmax.AuthenticationScreen$OnOKButtonPress.actionPerformed(AuthenticationScreen.java:629)
I assure you, "startMySQL.bat" is there under "bin"
Thanks,
Sandeep

Running System commands using Runtime.exec()

I'm trying to run an example from "The Java Programming Language" book by Arnold, Gosling and Holmes. I'm trying to run a system level command and get the results. The code looks like:
public static String[] runCommand(String cmd) {
String[] outputData= null;
String[] cmdArray = {"/usr/bin/ls", "-l", "/tmp"};
try {
Process child = Runtime.getRuntime().exec(cmdArray);
InputStream in = child.getInputStream();
InputStreamReader reader = new InputStreamReader(output);
BufferedReader = new BufferedReader(reader);
// read the commands output
int counter = 0;
String line;
while ((line = input.readLine()) != null)
outputData[counter++]= line;
if (child.waitFor() != 0){ // error when it's not 0
System.out.println("Couldn't run the command.");
System.out.println("It produced the following error message : " + child.exitValue());
outputData = null;
} catch (Exception e){
System.out.println("It got here!");
System.out.println("It produced the following error message : " + e.getMessage());
outputData = null;
return outputData;
It gets to the while line, trys to run the input.readLine() and kicks out the exception that looks like:
It got here!
It produced the following error message : null
I know it gets to the input.readLine() because I had a whole lot more try blocks in there, but for simplicity left it out (so it look like the code in the book, which I tried originally). When I run the same command from the command line (on our Sun Solaris 2.8 system) I get results back. I'm not sure what I'm doing wrong. Any help would be greatly appreciated. Thanks.

Hi, duffymo, hope you can help me. Consider this servlet code:
String theCommand = "csh /export/home/gls03/sasstuff/runsas.csh /export/home/g
ls03/sasstuff/gary2.sas";
//Create a parent Process for the sas program subprocess:
Process p = rt.exec(theCommand);
System.out.println("after call to rt.exec(theCommand)");
Here is the runsas.csh script:
#!/bin/csh
setenv LD_LIBRARY_PATH /opt/sybase/lib:/usr/lib:/usr/openwin/lib:/opt/SUNWspro/S
C2.0.1
setenv SASROOT /usr/local/CDC/SAS_8.2
setenv XKEYSYMDB /usr/local/CDC/SAS_8.2/X11/resource_files/XKeysymDB
$SASROOT/sas -sasuser /hpnpages/cgi-bin/applinks/hospcap/tmp $1
The execution never gets to the println statment, here is the error:
class java.io.IOException Exception. Message: CreateProcess: csh /export/home/g
ls03/sasstuff/runsas.csh /export/home/gls03/sasstuff/gary2.sas error=2
java.io.IOException: CreateProcess: csh /export/home/gls03/sasstuff/runsas.csh /
export/home/gls03/sasstuff/gary2.sas error=2
at java.lang.Win32Process.create(Native Method)
at java.lang.Win32Process.<init>(Win32Process.java:66)
at java.lang.Runtime.execInternal(Native Method)
at java.lang.Runtime.exec(Runtime.java:551)
at java.lang.Runtime.exec(Runtime.java:477)
at java.lang.Runtime.exec(Runtime.java:443)
at sasRunnerNew.doPost(sasRunnerNew.java:103)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubIm
pl.java:262)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:21)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.ja
va:27)
at us.ny.state.health.hin.hinutil.HinFilter.doFilter(HinFilter.java:124)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.ja
va:27)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppSe
rvletContext.java:2643)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestIm
pl.java:2359)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
The command runs fine in unix.
I've also tried using these as arguments to exec:
String theCommand = "/bin/csh /export/home/gls03/sasstuff/runsas.csh /export/home/gls03/sasstuff/gary2.sas";
String[] theCommand = {"csh", "/export/home/gls03/sasstuff/runsas.csh", "/export/home/gls03/sasstuff/gary2.sas"};
These generate the same error. I'm thinking this is a sas-specific problem.
Thanks for any help. Gary

Runtime.exec error in windows

When i try to run an external program with Runtime.exec() in windows 2000, i get a windows pop-up with the following error msg:
d:\winnt\system32\ntvdm.exe
Error while setting up environment for the application.
I have no idea how to fix this since i have no clue to what that error means.
Thanks
Rumy

I've personally just encountered the same error. I am building a piece of demonstration software to distribute with my graduate school applications to demonstrate my programming experience and I wish to include a set of programs I wrote some years ago in Pascal and C++. The software has been compiled for MS-DOS 6.0. I am using the following command to execute the software from within my Java program:
Runtime.getRuntime().exec(new String[]{"command.com","/c","12cards.bat"});The batch file performs the appropriate setup operations for the program and runs the executable. When I run this code segment, I receive the following error:
[16 bit MS-DOS Subsystem]
C:\WINNT\system32\ntvdm.exe
Error while setting up environment for the application. Choose 'Close' to terminate the application.
I have another code segment in which I attempt to run the executable myself (without the help of command.com or the batch file). The code segment is as follows:
Runtime.getRuntime().exec(new String[]{"12cards.exe"}, new String[0], workingDir);When I run this code segment, the following IOException is thrown:
java.io.IOException: CreateProcess: 12CARDS.EXE error=2
     at java.lang.Win32Process.create(Native Method)
     at java.lang.Win32Process.<init>(Win32Process.java:66)
     at java.lang.Runtime.execInternal(Native Method)
     at java.lang.Runtime.exec(Runtime.java:566)
     at (my code)I have already found the document on Microsoft's support website which describes a solution to this problem. Manually extracting the autoexec.nt, config.nt, and command.com files from the installation CD-ROM did not help.
The most confusing element of this: 12CARDS.EXE runs fine if I execute it from Windows Explorer. It's only a problem if it's executed from within my Java program. I have two other DOS programs which I want to include as well; I am having the same trouble with them.
Any advice will be much appreciated. Thanks!

Runtime.exec(): VM creates batch executions???

Similar Messages

Maybe you are looking for