Create executable jar file

Author: mpkorstanje

.github/workflows/test-java.yml

@@ -36,6 +36,9 @@ jobs:
           java-version: ${{ matrix.java }}
           cache: 'maven'
 
-      - run: mvn verify
+      - run: | 
+          mvn verify
+          # Test if the jar file works
+          java -jar target/messages-cli-*-SNAPSHOT.jar  --help
         working-directory: java
 

java/pom.xml

@@ -25,6 +25,7 @@
         <html-formatter.version>22.2.0</html-formatter.version>
         <junit-xml-formatter.version>0.11.0</junit-xml-formatter.version>
         <testng-xml-formatter.version>0.7.0</testng-xml-formatter.version>
+        <project.build.mainClass>io.cucumber.messages.cli.MessagesCli</project.build.mainClass>
     </properties>
 
     <scm>
@@ -121,14 +122,51 @@
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jar-plugin</artifactId>
+                <artifactId>maven-shade-plugin</artifactId>
                 <configuration>
-                    <archive>
-                        <manifest>
-                            <mainClass>io.cucumber.messages.cli.MessagesCli</mainClass>
-                        </manifest>
-                    </archive>
+                    <filters>
+                        <filter>
+                            <artifact>*:*</artifact>
+                            <excludes>
+                                <exclude>META-INF/versions/9/module-info.class</exclude>
+                                <exclude>META-INF/*.SF</exclude>
+                                <exclude>META-INF/*.DSA</exclude>
+                                <exclude>META-INF/*.RSA</exclude>
+                                <exclude>META-INF/MANIFEST.MF</exclude>
+                            </excludes>
+                        </filter>
+                    </filters>
+                    <transformers>
+                        <transformer
+                                implementation="org.apache.maven.plugins.shade.resource.ApacheLicenseResourceTransformer">
+                        </transformer>
+                        <transformer
+                                implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer">
+                            <addHeader>false</addHeader>
+                        </transformer>
+                        <transformer
+                                implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+                        <transformer
+                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                            <manifestEntries>
+                                <Main-Class>${project.build.mainClass}</Main-Class>
+                                <Specification-Title>${project.artifactId}</Specification-Title>
+                                <Specification-Version>${project.version}</Specification-Version>
+                                <Implementation-Title>${project.artifactId}</Implementation-Title>
+                                <Implementation-Version>${project.version}</Implementation-Version>
+                                <Implementation-Vendor-Id>${project.groupId}</Implementation-Vendor-Id>
+                            </manifestEntries>
+                        </transformer>
+                    </transformers>
                 </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
             </plugin>
         </plugins>
     </build>