Develop Reference

pi4j-maven Archetype support via Maven in Intelli Idea

I want to write java code using the dependency Pi4j and using Intellij on Windows 10. The target platform is a Pi Zero W.
The instructions to develop on remote (Windows 10 in this case) PC say to add the p4j-maven-archetype but don't explain how to use this maven tool within the maven included with Intellij.
I have tried to download the p4j-maven-archetype, extract it, then open Intellij and import p4j-maven-archetype as a project. Then from within Intellij I run the maven goal install so it can be used in other projects.
How would I now create a new project within Intellij using the p4j-maven-archetype that I installed?
Is there a way to package and run it remotely on the Pi from Intellij?

Since this is an archetype that you first need to install into your local Maven repository, follow the steps from corresponding instructions for the archetype project:
Install the archetype to your local .m2 repository
Unzip the archetype file in a folder
cd folder/raspimaven-archetype
mvn install
Then use project generation Maven command:
mvn archetype:generate -DarchetypeCatalog=local
Or use IDE wizard to create the project from the locally installed archetype: New Project | Maven -> Create from archetype:

How to create maven projects on VS code?

I've already succeed creating java project on vs code. I am installing Java extension pack which is auto install another plugin (like language support by red hat and etc), I am using jdk 8 (jdk1.8.0_241). I am using command palette to create new java project. But my new project doesn't contain pom.xml
Anyway I don't install dedicated maven, only Maven for java extension
I need maven for iReport/jaspers dependencies

You are probably creating a new "Java Project", which is Eclipse-based structure, not Maven.
In the command pallet (Cmd+P on macOS), type Maven and you shall see "Maven: Create Maven Project".
Next step, the extension will ask you which Maven Archetype to use. Select "maven-archetype-quickstart".
You will be asked for input on the terminal after this.
Once the project is generated, type $ code to open a new VSC window.
Done.

You can execute this by cmd:
mvn archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-quickstart -DgroupId=com.mycompany.app -DartifactId=my-app
This will generate a maven-archetype-quickstar project.

Maven works in Command Prompt, but not in Power Shell

I am very new to Maven and initial stages where i am exploring how to create a java EE project that i can host in a server. Maintain it through Maven.
First question is asked is how do i create the same structure of a java project that is created by Eclipse when i create a new Maven project in command line in Power Shell?
My findings -
Please see the image snippet
I understand that once we have a project crated. If you want to add modify how your project should build, we can modify that, or we can add new dependencies or many other things from the POM.xml.
But initially atleast it should create the structure of the maven project with a minimal pom.xml right ?
I used the command mvn archetype:generate .... In the Command Prompt the project was created correctly. But I need Maven work in the Power Shell, and this produces an error:
The goal you specified requires a project to execute but there is no POM
in this directory ...
Thanks in Advance

See tutorial. It is pretty good:
https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html
To create a project structure:
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=false
For PowerShell, use quotes for -D, as follows:
mvn -B archetype:generate "-DarchetypeGroupId=org.apache.maven.archetypes" "-DgroupId=com.mycompany.app -DartifactId=my-app"

Want to build project with commandline mvn but have to use Maven update in eclipse first

I'm working with multiple projects in Eclipse. because I want to automate the building I want to script the building process.
Unfortunately I cannot do the same actions on the commandline as in Eclipse.
So a common problem is that when a new function from a referenced project is used, I cannot build the project on the commandline with mvn. I use the command:
mvn clean install -U
But this command will give a build failure until I do a Eclipse Maven Update from the eclipse GUI. After that I can build the project again.
I also tried all the other commands I came across Stackoverflow:
mvn eclipse:eclipse
mvn dependency:resolve
So I just want to that Maven Update command in eclipse from the commandline so I can build from the commandline. If anyone could tell me what I'm doing wrong that would be awesome.
Thx in advance
Update for more clarification:
The project structure is:
Rest-service, Framework-service, Framework-model
Framework-model is referenced in the pom file by Framework-service and Framework-service is referenced by Rest-service. The other projects are not relevant to the problem.
When a function is added to Framework-model and used in Rest-service it gives an compilation error in eclipse and when I build with mvn clean install -U, although Maven install in eclipse is succesful but I think it is still using the old compiled code. After a Maven Update command in eclipse the compilation error is gone. And mvn clean install -U from the commandline also works.
How could I do a Maven Update command in the commandline? If mvn clean install -U should also do a Maven Update command, what settings should I check?
Another update: So this weekend I tried different things and running mvn compile before the mvn clean install -U command gives a different output. And finds the new function. But as I read maven, I thought install should also do the previous steps. How is this possible?

Eclipse's Maven plugin uses the maven version configured in Preferences/Maven/User settings. If you have a different version of maven in your Eclipse's settings than the one on your PATH variable, you could have different outputs. Maybe try and check that.

How to create a GWT project with MAVEN support?

I have core experience of maven(on console) and GWT. Now I want to create a simple GWT Project with the support of maven in eclipse. Is there is any tutorial for GWT-Maven ?
so please describe step by step procedure to configuration in eclipse.

gwt-maven-plugin is useful.
Created project by following command can be imported as "Existing Maven Projects" on Eclipse.
$ mvn archetype:generate -DarchetypeGroupId=org.codehaus.mojo -DarchetypeArtifactId=gwt-maven-plugin -DarchetypeVersion=2.7.0