Running Maven from Java code in Windows?

Question

I am trying to run maven from my java class based on this suggestion:

Runtime.getRuntime().exec("mvn");

but I get:

java.io.IOException: Cannot run program "mvn": CreateProcess error=2, The system cannot find the file specified

mvn is on my path and I can run it just fine from cmd:

C:\Users\m>mvn -v
Apache Maven 3.0.3 (r1075438; 2011-02-28 18:31:09+0100)
Maven home: C:\apache-maven-3.0.3\bin\..
Java version: 1.6.0_20, vendor: Sun Microsystems Inc.
Java home: C:\Program Files\Java\jdk1.6.0_20\jre
...

any suggestions?

Better use Maven embedder, look at stackoverflow.com/a/19904341/516167 — MariuszS
– MariuszS, Commented Nov 11, 2013 at 10:45

Tim Bender · Accepted Answer · 2012-03-12 20:40:47Z

10

Try:

Runtime.getRuntime().exec("cmd \c mvn");

Edit: In response to the firs question...

Yes. See: Process#getInputStream. Basically you will need to consume the output from the sub-process being created.

I also like this article: http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

edited Mar 12, 2012 at 20:40

answered Mar 12, 2012 at 20:26

Tim Bender

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2 Comments

u123 Over a year ago

I need to do: Runtime.getRuntime().exec("cmd /C mvn"); but I don't get any output in my console, is it necessary to pipe that out somehow?

ses Over a year ago

it produces if: BufferedReader in = new BufferedReader( new InputStreamReader(p.getInputStream()) ); String line = ""; while ((line = in.readLine()) != null) { System.out.println(line);

Codex · Accepted Answer · 2022-03-03 23:57:04Z

7

Use mvn.cmd instead of mvn or mvn.bat.
It works fine (on Windows OS).
But keep in mind the OS compatibility issue (Windows/Linux).

edited Mar 3, 2022 at 23:57

answered Feb 8, 2019 at 6:51

Codex

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Comments

ichaki5748 · Accepted Answer · 2014-02-07 11:24:03Z

2

You can view mvn.bat and echo which java command is actually executed and run it directly.

In mvn.bat:

%MAVEN_JAVA_EXE% %MAVEN_OPTS% -classpath %CLASSWORLDS_JAR% "-Dclassworlds.conf=%M2_HOME%\bin\m2.conf" "-Dmaven.home=%M2_HOME%" %CLASSWORLDS_LAUNCHER% %MAVEN_CMD_LINE_ARGS%

In my machine executing dependency:tree is:

"java -classpath \"C:\dev\tools\apache-maven-3.1.1\boot\plexus-classworlds-2.5.1.jar\" -Dclassworlds.conf=C:\dev\tools\apache-maven-3.1.1\bin\m2.conf -Dmaven.home=\"C:\dev\tools\apache-maven-3.1.1\" org.codehaus.plexus.classworlds.launcher.Launcher dependency:tree"

answered Feb 7, 2014 at 11:24

ichaki5748

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Comments

Guillaume Polet · Accepted Answer · 2012-03-12 20:25:12Z

1

Error 2 means that the executable cannot be found by the JRE environment. This means that the PATH environment variable does not contain the Maven binary directory.

2 choices here:

Make sure that the Maven bin directory is in the PATH environment variable
Use an absolute path to the mvn command.

Alternatively, this could also be due to a permission denied, but it is less likely the case.

answered Mar 12, 2012 at 20:25

Guillaume Polet

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2 Comments

IgorGanapolsky Over a year ago

I added C:\User\username\apache-maven-3.0.4\bin to my system PATH, but I still get the same error.

liltitus27 Over a year ago

Try restarting ide and possibly your computer. I followed the instructions from Guillame as well, and also experienced the same issue after i added maven to the PATH. However, once I restarted my computer, Maven was found on the PATH and Eclipse was able to run the maven command. Hope this helps...

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