executing runtime cmd from java program

Question

I want to run my Ant script i.e (build.xml) through my java program , following is part of mycode

  Runtime rt = Runtime.getRuntime();
  Process proc = rt.exec("build.xml");

but I'm getting the following error

java.io.IOException: Cannot run program "build.xml": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
    at java.lang.Runtime.exec(Runtime.java:593)
    at java.lang.Runtime.exec(Runtime.java:431)
    at java.lang.Runtime.exec(Runtime.java:328)
    at com.infotech.RunCmd.main(RunCmd.java:12)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(ProcessImpl.java:81)
    at java.lang.ProcessImpl.start(ProcessImpl.java:30)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)
    ... 4 more

How to solve it?

I think you are missing a few commands inside your rt.exec(..). Perhaps it should read rt.exec("ant [target]"). As it stands you are trying to execute an xml file. — Justin Shield
– Justin Shield, Commented Jul 6, 2011 at 10:05
shouldn't be you trying something Process proc = rt.exec("PATH/TO/ANT_HOME/ant [options] [target [target2 [target3] ...]]"); — Nishant
– Nishant, Commented Jul 6, 2011 at 10:05
If you are still having issues could you add to this question, otherwise could you please accept an answer :) — David
– David, Commented Nov 29, 2011 at 23:35

MByD · Accepted Answer · 2011-07-06 10:06:09Z

1

You should execute ant -buildfile build.xml, so use rt.exec("ant -buildfile build.xml"); (build.xml is not a command) if build.xml is not in the application folder, you will need to give its actual path.

answered Jul 6, 2011 at 10:06

MByD

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David · Accepted Answer · 2011-07-06 10:05:40Z

0

Is build.xml actually in the directory you are running from, have you tried putting the file directory path in rt.exec()?

answered Jul 6, 2011 at 10:05

David

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Fernando Miguélez · Accepted Answer · 2011-07-06 10:06:05Z

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You do not invoke "build.xml" from command line, but "ant" that looks for a "build.xml" in your current directory. So change your code (assuming ant launcher is accessible from your PATH) to:

Runtime rt = Runtime.getRuntime();
Process proc = rt.exec("ant");

answered Jul 6, 2011 at 10:06

Fernando Miguélez

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1 Comment

techie Over a year ago

here is my actual code , still iam getting error.Actally my build.xml which i want to run is in following path D:ant\trai; my Ant_Home is in D:apacheant\bin

Bohemian · Accepted Answer · 2011-07-06 10:21:53Z

0

For a start, the executable is ant. The command parameter is build.xml.

Secondly, you need to use absolute paths for your files/executables or be sure of your runtime environment's directory

edited Jul 6, 2011 at 10:21

answered Jul 6, 2011 at 10:06

Bohemian♦

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