I'm in the process of writing a java program for a Raspberry Pi where I want to access the GPIO. For this I use the Pi4J-Library Version 2 (https://pi4j.com). As IDE I use Visual Studio Code - as they suggest.
In my VSC workspace are included:
mvn archetype:generate -DarchetypeCatalog=local
)I can compile and package the minimal example application and my own project using the appropriate maven commands.
Then I have a java library for desktop applications I wrote myself. I added this library and a project, that uses the library, to the workspace. I can run this desktop application from VSC. The library and the application where originally written using Eclipse. Maven is not involved.
Now I'm trying to use a class from the desktop-library in my Pi4J-project: new MyLibClass
VSC displays "MyLibClass cannot be resolved to a type". I have imported the class: import package.name.MyLibClass
. Obviously the Pi4J-project doesn't know where to find the class. But when I CTRL-click the class name, it opens the corresponding file.
I think I need to add a dependency to the pom.xml of my Pi4J-project.
But I have absolutely no idea what to specify for groupId
, artifactId
and version
. The desktop-library is not a maven project.
Thanks a lot for your help in advance!
Maven supports three types of repository: local, central and remote. Normally, dependencies you add to your pom.xml
file are pulled from the central repository. What you can do is compile your library to a jar, and drop that in your local repository, which can be found in one of the following locations depending on your OS:
You can install your jar in your local repository as follows:
mvn install:install-file \
-Dfile=<path-to-file> \
-DgroupId=<group-id> \
-DartifactId=<artifact-id> \
-Dversion=<version> \
-Dpackaging=<packaging> \
-DgeneratePom=true
After that the jar will be copied into your local repository in a folder structure that mirrors the groupId
. And since you've provided a custom groupId
, artifactId
and version
you can use those to add the dependency to your pom.xml
Alternatively, you can add a local repository to your project and install your jar there, then add the dependency to your pom.xml
as normal.