How do I run a batch file from my Java Application

Question

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

User · Accepted Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

The following is working fine   String path  cmd  c start d   sample  sample bat   Runtime rn Runtime getRuntime    Process pr rn exec path

User · Answer

ProcessBuilder is the Java 5 6 way to run external processes

User · Answer

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

User · Answer

This code will execute two commands bat that exist in the path C  folders folder   Runtime getRuntime   exec  cd C  folders folder  amp  call commands bat

User · Answer

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

User · Answer

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

[java] How do I run a batch file from my Java Application?

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