Move module compilation to java9+ profile activated on JDK 9+

Co-authored-by: slawekjaranowski <[email protected]>

Author: Copilot

pom.xml

@@ -67,40 +67,6 @@
           </instructions>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <!-- defaults for compile and testCompile -->
-        <configuration>
-          <!-- Only required when JAVA_HOME isn't at least Java 9 and when haven't configured the maven-toolchains-plugin -->
-          <jdkToolchain>
-            <version>9</version>
-          </jdkToolchain>
-          <release>8</release>
-        </configuration>
-        <executions>
-          <execution>
-            <id>default-compile</id>
-            <configuration>
-              <!-- compile everything to ensure module-info contains right entries -->
-              <release>9</release>
-            </configuration>
-          </execution>
-          <execution>
-            <id>base-compile</id>
-            <goals>
-              <goal>compile</goal>
-            </goals>
-            <!-- recompile everything for target VM except the module-info.java -->
-            <configuration>
-              <release>8</release>
-              <excludes>
-                <exclude>module-info.java</exclude>
-              </excludes>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-scm-publish-plugin</artifactId>
@@ -132,4 +98,43 @@
     </plugins>
   </build>
 
+  <profiles>
+    <profile>
+      <id>java9+</id>
+      <activation>
+        <jdk>[9,)</jdk>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-compiler-plugin</artifactId>
+            <executions>
+              <execution>
+                <id>default-compile</id>
+                <configuration>
+                  <!-- compile everything to ensure module-info contains right entries -->
+                  <release>9</release>
+                </configuration>
+              </execution>
+              <execution>
+                <id>base-compile</id>
+                <goals>
+                  <goal>compile</goal>
+                </goals>
+                <!-- recompile everything for target VM except the module-info.java -->
+                <configuration>
+                  <release>8</release>
+                  <excludes>
+                    <exclude>module-info.java</exclude>
+                  </excludes>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
 </project>