Try adding the maven-compiler-plugin directly to make sure the java version is set correctly

pom.xml

@@ -648,6 +648,15 @@
                         </execution>
                     </executions>
                 </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <configuration>
+                        <parameters>true</parameters>
+                        <source>${java.version}</source>
+                        <target>${java.version}</target>
+                    </configuration>
+                </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-source-plugin</artifactId>
@@ -703,6 +712,10 @@
             </plugins>
         </pluginManagement>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-resources-plugin</artifactId>