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How to run testNG xml in a maven project without using surefire plugin with command prompt?

I am trying to run testng.xml in a maven project as part of selenium automation testing using the command line in windows. Able to execute testng.xml from the command prompt using java org.testng.TestNG testng.xml command when it is a Java project. But my requirement is to execute testng.xml in a Maven project using the command line. I understood that this can be achieved using surefire plugin but due to workplace-related restrictions, I am not permitted to add this plugin in pom.xml.
I tried to execute testng.xml in maven project as like in a java project and also mentioned all required folders and paths (including target/classes and target/test-classes folders in maven project) in classpath using -cp yet command line thrown error stating Cannot find class in classpath: <packagename>.<classname>. Kindly suggest.

Using maven commands in the Intellij terminal returns Process terminated

I have maven installed and linked to the project through specifying the home path (Maven home path) in the project settings as Intellij instructs. Whenever running any command with the mvn prefix like mvn -v it returns Process Terminated
Process Terminated
If run without the ide the terminal returns C:\Users\jacec\OneDrive\Desktop\DMA\maventest>mvn -v 'mvn' is not recognized as an internal or external command, operable program or batch file.

Terminal might be different with intellij setup. You can run the maven task through maven tool window from Intellij tab, like this
tutorial.
Or if you insist to use through the terminal, you might want to check your environment variables in your windows settings. And add variable MAVEN_HOME with the value of the maven install directory. Then add value %MAVEN_HOME%\bin in your system Path variable.

How to run the java code from command prompt which is dependent on many other projects

I am new to maven. I have maven code repository synced in eclipse. I have a one main file say Main.java which is dependent on several other projects which I have added using maven. I am able to run Main.java from eclipse.
How can I run the same file from command prompt?

Assuming that the class you are trying to run has a main method, try the command mvn compile exec:java -Dexec.mainClass=yourpackage.yourClassName

How can I use mvn verify command?

I need an example of how can I apply and use the command "mvn verify"
I have Eclipse and Maven library.
I also created all test files.
Now I want to use mvn verify so where can I run this command?
From which screen or window? Is it from Eclipse or from cmd?

Verify is just another build lifecycle in maven so you can run it in command line from within the directory of your pom.xml file like any other maven command .
If you want to run it from eclipse navigate to Run >> Run Configuration menu, select Maven build from left sidebar and make your own maven build. In order to have Maven build section you need M2Eclipse plugin added to Eclipse.

Maven from command line with multiple eclipse projects

Suppose I have the following file/project structure.
MSPCommon/trunk/pom.xml
MSPWebManager/trunk/pom.xml
and MSPWebManager depends on MSPCommon and MSPCommon and MSPWebManager are in the same directory.
I have imported these projects into eclipse, and within eclipse I can successfully do maven builds on MSPWebManager (like mvn clean compile) IF I do it the following way. Go to Run -> Run configurations, type in the maven commands AND select Resolve Workspace artifacts.
That's all great, but what I would like to be able to do is run the same maven commands from the command line. So I navigate to the MSPWebManager/trunk directory, do a mvn command like mvn clean compile and this is the result:
As you can see there is one other local jar that is missing, but for simplicity I only included one in this question because I'm assuming the fix is the same for them all.
Also, if I do some type of build within eclipse but I do NOT check the Resolve Workspace artifacts, I get the same error as I do on the command line.
Any suggestions on how to get this to work from the command line?
Thanks

Go to the module MSPCommon and run a mvn clean install then go to MSPWebManager and do the mvn clean compile
mvn install resolves the dependencies and installs your build inside of your .m2 repository / folder.