In my Java application, I want to run a batch file that calls "scons -Q implicit-deps-changed build\file_load_type export\file_load_type"
It seems that I can't even get my batch file to execute. I'm out of ideas.
This is what I have in Java:
Runtime.
getRuntime().
exec("build.bat", null, new File("."));
Previously, I had a Python Sconscript file that I wanted to run but since that didn't work I decided I would call the script via a batch file but that method has not been successful as of yet.
Batch files are not an executable. They need an application to run them (i.e. cmd).
On UNIX, the script file has shebang (#!) at the start of a file to specify the program that executes it. Double-clicking in Windows is performed by Windows Explorer. CreateProcess does not know anything about that.
Runtime.
getRuntime().
exec("cmd /c start \"\" build.bat");
Note: With the start \"\" command, a separate command window will be opened with a blank title and any output from the batch file will be displayed there. It should also work with just `cmd /c build.bat", in which case the output can be read from the sub-process in Java if desired.
Sometimes the thread execution process time is higher than JVM thread waiting process time, it use to happen when the process you're invoking takes some time to be processed, use the waitFor() command as follows:
try{
Process p = Runtime.getRuntime().exec("file location here, don't forget using / instead of \\ to make it interoperable");
p.waitFor();
}catch( IOException ex ){
//Validate the case the file can't be accesed (not enought permissions)
}catch( InterruptedException ex ){
//Validate the case the process is being stopped by some external situation
}
This way the JVM will stop until the process you're invoking is done before it continue with the thread execution stack.
Runtime runtime = Runtime.getRuntime();
try {
Process p1 = runtime.exec("cmd /c start D:\\temp\\a.bat");
InputStream is = p1.getInputStream();
int i = 0;
while( (i = is.read() ) != -1) {
System.out.print((char)i);
}
} catch(IOException ioException) {
System.out.println(ioException.getMessage() );
}
ProcessBuilder is the Java 5/6 way to run external processes.
To run batch files using java if that's you're talking about...
String path="cmd /c start d:\\sample\\sample.bat";
Runtime rn=Runtime.getRuntime();
Process pr=rn.exec(path);`
This should do it.
The executable used to run batch scripts is cmd.exe which uses the /c flag to specify the name of the batch file to run:
Runtime.getRuntime().exec(new String[]{"cmd.exe", "/c", "build.bat"});
Theoretically you should also be able to run Scons in this manner, though I haven't tested this:
Runtime.getRuntime().exec(new String[]{"scons", "-Q", "implicit-deps-changed", "build\file_load_type", "export\file_load_type"});
EDIT: Amara, you say that this isn't working. The error you listed is the error you'd get when running Java from a Cygwin terminal on a Windows box; is this what you're doing? The problem with that is that Windows and Cygwin have different paths, so the Windows version of Java won't find the scons executable on your Cygwin path. I can explain further if this turns out to be your problem.
Process p = Runtime.getRuntime().exec(
new String[]{"cmd", "/C", "orgreg.bat"},
null,
new File("D://TEST//home//libs//"));
tested with jdk1.5 and jdk1.6
This was working fine for me, hope it helps others too.
to get this i have struggled more days. :(
I had the same issue. However sometimes CMD failed to run my files.
That's why i create a temp.bat on my desktop, next this temp.bat is going to run my file, and next the temp file is going to be deleted.
I know this is a bigger code, however worked for me in 100% when even Runtime.getRuntime().exec() failed.
// creating a string for the Userprofile (either C:\Admin or whatever)
String userprofile = System.getenv("USERPROFILE");
BufferedWriter writer = null;
try {
//create a temporary file
File logFile = new File(userprofile+"\\Desktop\\temp.bat");
writer = new BufferedWriter(new FileWriter(logFile));
// Here comes the lines for the batch file!
// First line is #echo off
// Next line is the directory of our file
// Then we open our file in that directory and exit the cmd
// To seperate each line, please use \r\n
writer.write("cd %ProgramFiles(x86)%\\SOME_FOLDER \r\nstart xyz.bat \r\nexit");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
// Close the writer regardless of what happens...
writer.close();
} catch (Exception e) {
}
}
// running our temp.bat file
Runtime rt = Runtime.getRuntime();
try {
Process pr = rt.exec("cmd /c start \"\" \""+userprofile+"\\Desktop\\temp.bat" );
pr.getOutputStream().close();
} catch (IOException ex) {
Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
}
// deleting our temp file
File databl = new File(userprofile+"\\Desktop\\temp.bat");
databl.delete();
The following is working fine:
String path="cmd /c start d:\\sample\\sample.bat";
Runtime rn=Runtime.getRuntime();
Process pr=rn.exec(path);
This code will execute two commands.bat that exist in the path C:/folders/folder.
Runtime.getRuntime().exec("cd C:/folders/folder & call commands.bat");
import java.io.IOException;
public class TestBatch {
public static void main(String[] args) {
{
try {
String[] command = {"cmd.exe", "/C", "Start", "C:\\temp\\runtest.bat"};
Process p = Runtime.getRuntime().exec(command);
} catch (IOException ex) {
}
}
}
}
To expand on #Isha's anwser you could just do the following to get the returned output (post-facto not in rea-ltime) of the script that was run:
try {
Process process = Runtime.getRuntime().exec("cmd /c start D:\\temp\\a.bat");
System.out.println(process.getText());
} catch(IOException e) {
e.printStackTrace();
}
i am new to this Process Thing in java and i am having a problem with this shell command that i want to run in java.
I have this file with a large set of data in it and i want to convert it using XSL.
The command is working fine if run on cmd.exe but is not working in java code.
I have used the process wait too but still there is no output. Please help.
Thanks
Small fragment of code
String c="java -Xmx1g -jar c:\\temp\\FileConverter.jar xmlTransform title \"Data\" root \"c:\\temp\\\" src \"c:\\temp\\input.xml\" xsl \"converter.xsl\" xsl:MEMBER_CODE \"111\" xsl:MEMBER_NAME \"ABC\" xsl:MEMBER_PASSWORD \"abc\" dst \"c:\\temp\\dummy.xml\" src-error \"c:\\temp\\error\"";
Runtime rt = Runtime.getRuntime();
try {
Process proc = rt.exec(c);
synchronized (proc) {
proc.wait(10000);
}
System.out.println("Done");
}catch (IOException e) {
e.printStackTrace();
}
I tried out a simple program to execute Linux command at run time. But the following program gets compiled and runs without any error, but the text file is not getting created as intended.Is there anything wrong in this program?
import java.io.*;
class ExecuteJava
{
public static void main(String args[])
{
String historycmd = "cat ~/.bash_history >> Documents/history.txt";
try
{
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(historycmd);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
Try accessing some of the functions Process provides. I'd start with exitValue. Typically a -1 indicates something went wrong while a 0 means nothing especially bad happened.
Also try InputStream and Error Stream, and read them fully. See if either has useful feedback for you.
Other than that, try what andy256 suggests in comments. Ensure the Documents directory exists in the executing directory of the program.
The append operator >> is meant to be interpreted as part of the command shell. Use
String[] historycmd =
{ "bash", "-c", "cat ~/.bash_history >> Documents/history.txt"};
I use the following to launch a Java application from another Java app.
ProcessBuilder pb = new ProcessBuilder(javaPath + javaCommand, maxMemStr,
minMemStr, stackSizeStr, jarCommand, jarfile, jarArg);
try {
Process p = pb.start();
} catch (IOException ex) {
Logger.getLogger(launch.class.getName()).log(Level.SEVERE, null, ex);
}
where javaCommand is either java or javaw (javaPath is empty most of the time unless a user points to an alternate path). The problem is, after the app launches, even when I verify the process list to contain java, it doesn't show the console.
Is it because PrcoessBuilder doesn't invoke the command shell? Is there a way to show the console programatically?
Thanks in advance.
This is because the "command console" itself is a process that attaches to the std-in/-out/-err streams of another process and displays them on the screen. When you launch Java all by itself, no other processes will be handling those streams, hence the lack of a command console. To get the results you want, you will need to launch a new instance of the command console and subsequently have it run your custom java command.
There may be a better way to do this... but I think the solution to this is going to be platform-dependent. In Windows, you could do something like:
ProcessBuilder pb = new ProcessBuilder("start", "\"JAwesomeSauce\"", "cmd.exe",
"/k", javaPath + javaCommand, maxMemStr, minMemStr, stackSizeStr, jarCommand,
jarfile, jarArg);
try {
Process p = pb.start();
} catch (IOException ex) {
Logger.getLogger(launch.class.getName()).log(Level.SEVERE, null, ex);
}
I assume you could do something similar in Linux/Mac if that's the O/S you're using.
You may want to run the command like this:
cmd /K java ...
or
cmd /C java ...
As far as I remember the Processbuilder opens a pipe to a specific process.
Your command window is a process itself with all you see. If you enter commands the cmd/bash usually creates new processes and attaches to them.
I want to call a c++ executable from a java program. But after I call it, nothing happens. Then after I close the program, there an error window appears, which says abnormal program termination.
The code looks like this :
try {
Runtime rt = Runtime.getRuntime();
Process p = rt.exec("discretize.exe");
} catch (Exception exc) {/*handle exception*/
exc.printStackTrace();
}
and the windows error that appears look like this :
http://dc532.4shared.com/img/8e2-xhaG/debug.PNG
Finally I found the answer.
The problem was the command prompt didn't show up. So after searching google, I found a tip that suggested I simply put:
cmd /c start
before the path of the file. So I changed my code to look like this:
Process myProcess = Runtime.getRuntime().exec("cmd /c start D:\A_TA\KODINGAN\TA\src\discretize.exe");
.. and voila, the command prompt shows!
I would try doing this below as found from this site: http://www.boards.ie/vbulletin/showthread.php?t=218960
Example:
Process myProcess = Runtime.getRuntime().exec("path to exe");