This change waits for apache/maven#11505

Once the PR is merged (and a new version of Maven is published)
we should be able to perform a simplified build wrt Maven resources.

Author: ascheman

jigsaw-examples/example_resources/m4/pom.xml

@@ -22,7 +22,7 @@
       <source>
         <module>modc</module>
       </source>
-      <source>
+¡      <source>
         <module>modmain</module>
       </source>
     </sources>
@@ -38,38 +38,6 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-resources-plugin</artifactId>
         <version>3.3.1</version>
-        <executions>
-          <execution>
-            <id>copy-modb-resources</id>
-            <phase>process-resources</phase>
-            <goals>
-              <goal>copy-resources</goal>
-            </goals>
-            <configuration>
-              <outputDirectory>${project.build.directory}/classes/modb</outputDirectory>
-              <resources>
-                <resource>
-                  <directory>src/modb/main/resources</directory>
-                </resource>
-              </resources>
-            </configuration>
-          </execution>
-          <execution>
-            <id>copy-modc-resources</id>
-            <phase>process-resources</phase>
-            <goals>
-              <goal>copy-resources</goal>
-            </goals>
-            <configuration>
-              <outputDirectory>${project.build.directory}/classes/modc</outputDirectory>
-              <resources>
-                <resource>
-                  <directory>src/modc/main/resources</directory>
-                </resource>
-              </resources>
-            </configuration>
-          </execution>
-        </executions>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>