Checking Maven Version

Question

I have just installed maven. I downloaded distributive, extracted files and set bin value environment variables, but when I type mvn -version in CMD I am getting message:

'mvn' is not recognized as an internal or external command,
operable program or batch file.

I am writing project. I have one project DatabaseAPI where I have logic of database and POJO classes. second project is CoreAPI where I have some methods. For DatabaseAPI I make a jar file using eclipse (export -> jar). In core I add external jar (DatabaseAPI.jar). For CoreAPI I make a jar file using eclipse (export -> jar). In core I add external jar (CoreAPI.jar) and I tried to start tomcat (I have servlets in my project and swing too). I got error during starting and error is ClassNotFoundException (One of the classes in CoreAPI did not find). Is it problem of exporting using Eclipse ?

Answer 1

Shorter

mvn -v 

or

mvn --version 

Output:

Apache Maven 3.0.5 (...) Maven home: ... Java version: 1.8.0_60, vendor: Oracle Corporation Java home: ... Default locale: en_US, platform encoding: Cp1252 OS name: "windows 7", version: "6.1", arch: "amd64", family: "dos" 

The other command (mvn -version) works because it starts with mvn -v.
You can also try mvn -v123 and you'll get the same output.

Details:

mvn -h 

or

mvn --help 

Output:

... -V,--show-version                      Display version information                                        WITHOUT stopping build -v,--version                           Display version information 

Command is not recognized

Probably you are in one of the following 2 situations:

1. You didn't add the Maven to the Path
   (run ECHO.%PATH:;= & ECHO.% in cmd to see if you are in this situation).
   • go to Control Panel\User Accounts\User Accounts
     (or click on your photo from the start menu)
   • click Change my environment variables
   • click on New... and add:
     • M2_HOME=<your_path>
     • MAVEN_HOME=%M2_HOME%
     • MAVEN_BIN=%M2_HOME%\bin
   • click on Edit... and add the ;%MAVEN_BIN% at the end of the Path
2. You added it to the Path, but you didn't open a new command prompt.
   • open a new command prompt, because the environment variables are not updated automatically

Answer 2

Type the command mvn -version directly in your maven directory, you probably haven't added it to your PATH. Here are explained details of how to add maven to your PATH variable (I guess you use Windows because you are talking about CMD).