Fix CI for JDK 17+

The `--add-exports=` flags are required after https://openjdk.org/jeps/396

Related to #222

RELNOTES=n/a
PiperOrigin-RevId: 592669579

pom.xml

@@ -147,6 +147,14 @@
         <artifactId>maven-site-plugin</artifactId>
         <version>3.12.1</version>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>3.2.3</version>
+        <configuration>
+          <argLine>${test.jvm.flags}</argLine>
+        </configuration>
+      </plugin>
     </plugins>
   </build>
 
@@ -233,5 +241,18 @@
         </plugins>
       </build>
     </profile>
+    <profile>
+      <id>add-exports</id>
+      <activation>
+        <jdk>[9,)</jdk>
+      </activation>
+      <properties>
+        <test.jvm.flags>
+          --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
+          --add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED
+          --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
+        </test.jvm.flags>
+      </properties>
+    </profile>
   </profiles>
 </project>