Java unable to execute CMD commands in java

Question

I have a problem. I am trying to execute the following command in java:

cd C:\Users\Alexander\Projects/Simulator && mvn package

In the CMD command line, this command does get executed correctly, but when I try to run it in java using the following code:

try {
    String compileSimulatorCommand = "cd C:/Users/Alexander/Projects/Simulator && mvn package";
    Process compileSimulatorProcess = Runtime.getRuntime().exec(compileSimulatorCommand);
    compileSimulatorProcess.waitFor();
} 
catch (Exception e) {
    e.printStackTrace();
}

But this returns in the following error:

java.io.IOException: Cannot run program "cd": CreateProcess error=2, The system cannot find the file specified
        at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1142)
        at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1073)
        at java.base/java.lang.Runtime.exec(Runtime.java:591)
        at java.base/java.lang.Runtime.exec(Runtime.java:415)
        at java.base/java.lang.Runtime.exec(Runtime.java:312)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
        at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
        at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
        at java.base/java.lang.ProcessImpl.create(Native Method)
        at java.base/java.lang.ProcessImpl.<init>(ProcessImpl.java:483)
        at java.base/java.lang.ProcessImpl.start(ProcessImpl.java:158)
        at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1109)

How can I fix this?

cd does not exist outside the command prompt, and you're not using the command prompt in your code. — Mark Rotteveel
– Mark Rotteveel, Commented Jun 5, 2021 at 10:49
The string literal has unescaped `s and does not compile. (Also you seem to be trying for a shell command rather than executing an executable. So you should use the executable cmd, sh` or similar depending upon platform.) — Tom Hawtin - tackline
– Tom Hawtin - tackline, Commented Jun 5, 2021 at 10:50
@TomHawtin-tackline sorry for the not compilable string, I am building the string using variables, but I copy/pasted it wrong. I have edited the string to how it should work. I need to run this program on linux and windows. How can I use the command prompt? — A. Vreeswijk
– A. Vreeswijk, Commented Jun 5, 2021 at 10:55

Madushan · Accepted Answer · 2021-06-05 11:06:26Z

6

You can't run cd as a command. You can instead set the working directory when you exec your command.

Process compileSimulatorProcess = Runtime
    .getRuntime()
    .exec(
        "mvn package", 
        null, 
        new File("C:/Users/Alexander/Projects/Simulator"));

Also might need import java.io.File

See docs for more info about this overload of exec.

answered Jun 5, 2021 at 11:06

Madushan

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2 Comments

A. Vreeswijk Over a year ago

java.io.IOException: Cannot run program "mvn" (in directory "C:\Users\Alexander\Projects\Simulator"): CreateProcess error=2, The system cannot find the file specified

, why can't I run mvn commands?

Madushan Over a year ago

mvn may not be in your Path. To check, in a cmd, run where mvn and use the full path. If it says not found, make sure mvn is installed.

ORT · Accepted Answer · 2024-08-12 23:21:06Z

0

Also here may be the problem with run actual .cmd (not .exe) files from ProcessBuilder.

For .cmd files add cmd.exe /c at the beginning of your command string.

Thanks jeroen-de-schutter and mahozad for this https://stackoverflow.com/a/21281570/15337095

answered Aug 12, 2024 at 23:21

ORT

11 silver badge

2 Comments

Abra Over a year ago

If the answer to another question is also appropriate for this question, then this question is a duplicate. Hence, rather than copying the other answer, you should mark this question as a duplicate.

ORT Over a year ago

i think it's not duplicate, these are different questions, but touch same topic

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