adoroszlai commented on code in PR #6939:
URL: https://github.com/apache/hadoop/pull/6939#discussion_r1678836599


##########
hadoop-common-project/hadoop-auth/pom.xml:
##########
@@ -272,5 +272,68 @@
         </plugins>
       </build>
     </profile>
+    <profile>
+      <id>java-8</id>
+      <activation>
+        <jdk>1.8</jdk>
+      </activation>
+      <properties>
+        <maven.compiler.source>${javac.version}</maven.compiler.source>
+        <maven.compiler.target>${javac.version}</maven.compiler.target>
+      </properties>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <version>3.0.0</version>
+            <executions>
+              <execution>
+                <id>enforce-java-version</id>
+                <goals>
+                  <goal>enforce</goal>
+                </goals>
+                <configuration>
+                  <rules>
+                    <requireJavaVersion>
+                      <version>1.8</version>
+                    </requireJavaVersion>
+                  </rules>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+    <profile>
+      <id>x509-suppress</id>
+      <activation>
+        <jdk>[9,)</jdk>
+      </activation>
+      <properties>
+        <maven.compiler.source>${javac.version}</maven.compiler.source>
+        <maven.compiler.target>${javac.version}</maven.compiler.target>

Review Comment:
   `source` and `target` are set for the same reason, to be able to build with 
newer Java, but still create binaries for Java 8.  `release` is similar, but 
better.



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