Ontop GitHub-Hosted Maven Repository

This Git repository provides a versioned Maven repository for publicly-available third-party Maven artifacts (JARs) used in Ontop projects and not available on Maven central.

For third-party artifacts in this repository, we include POM tags <URL> and <licenses> that respectively link to an artifact web page providing further information and download instructions and specify the artifact license (using SPDX identifiers if possible).

Usage of third-party artifacts is subject to their respective license terms. Most of them (e.g., JDBC drivers) are only used for the automated testing of Ontop and are in no way part of distributed Ontop bundles (i.e., Ontop users will have to obtain them from their respective web sites, if needed).

Usage of this repository outside Ontop projects is discouraged. While publicly accessible (to allow anyone to run dedicated tests), artifacts in this repository may be changed or deleted without notice according to Ontop projects needs, breaking third-party use.

How to import artifacts from this repository

Add the following to the pom.xml file of your Maven project:

<repositories>
    <repository>
        <id>ontop-3rd-party-maven-repo</id>
        <url>https://raw.githubusercontent.com/ontop/ontop-3rd-party-maven-repo/master/repository/</url>
    </repository>
</repositories>

After that, artifacts can be imported as regular Maven dependencies. Browse here to see available artifacts and obtain their maven coordinates (and pom.xml files, if needed).

How to deploy an artifact JAR file to this repository

Requirements. You need write access to this Git repository and of course the JAR file to deploy. If available online, you should also retrieve the pom.xml file for the artifact, otherwise you will have to supply one yourself (see later).

Create a pom.xml file (if needed). If not available, e.g., because the JAR does not come from a Maven project, you may create a pom.xml file by filling this template:

<?xml version="1.0" encoding="UTF-8"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <modelVersion>4.0.0</modelVersion>

    <groupId>GROUP_ID</groupId>
    <artifactId>ARTIFACT_ID</artifactId>
    <version>VERSION</version>
    
    <url>URL</url>

    <licenses>
        <license>
            <name>LICENSE_ID</name>
        </license>
    </licenses>
    
    <depedencies>
        <!-- any Maven dependency you want to list -->
    </dependencies>
    
</project>

Notes:

• placeholders GROUP_ID, ARTIFACT_ID, VERSION are mandatory and must be filled;
• if possible, placeholders URL and LICENSE_ID should be filled for third-party artifacts, referring to licensing information provided online or embedded in the JAR file itself (open the JAR file as a ZIP file and look for license files or metadata); this step is important to document artifact origin and license in both human and machine-readable ways;
• artifact dependencies are optional, but if present and listed here they help users importing this artifact, who will not have to manually list them in their pom.xml files, relying instead on Maven transitive dependency inclusion;
• while Maven can automatically generate a missing pom.xml file at deploy time (see generatePom option of maven-deploy-plugin), the generated file will not include any URL, license or dependency information.

Clone this repository (if not done before). In a terminal, execute:

git clone git@github.com:ontop/ontop-3rd-party-maven-repo.git
cd ontop-3rd-party-maven-repo

Deploy the JAR artifact locally. From the top-level directory of this repository (if elsewhere, replace ./repository with the appropriate path), execute the following commands filling the PATH_TO_JAR_FILE and PATH_TO_POM_FILE placeholders:

mvn install:install-file \
    -DcreateChecksum=true \
    -DlocalRepositoryPath=./repository \
    -Dfile=PATH_TO_JAR_FILE \
    -DpomFile=PATH_TO_POM_FILE

Commit and push the local change. Execute the following commands:

git add -A
git commit
git push