use junit-pioneer

gax-java/gax/pom.xml

@@ -103,7 +103,13 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <argLine>-Djava.util.logging.SimpleFormatter.format="%1$tY %1$tl:%1$tM:%1$tS.%1$tL %2$s %4$s: %5$s%6$s%n"</argLine>
+          <argLine>
+            -Djava.util.logging.SimpleFormatter.format="%1$tY %1$tl:%1$tM:%1$tS.%1$tL %2$s %4$s: %5$s%6$s%n"
+            <!-- workaround setup for using junit-pioneer with Java 17 or above,
+            see https://junit-pioneer.org/docs/environment-variables/#warnings-for-reflective-access -->
+            --add-opens java.base/java.util=ALL-UNNAMED
+            --add-opens java.base/java.lang=ALL-UNNAMED
+          </argLine>
         </configuration>
       </plugin>
     </plugins>

gax-java/gax/src/test/java/com/google/api/gax/rpc/EndpointContextTest.java

@@ -40,6 +40,7 @@
 import java.io.IOException;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.junitpioneer.jupiter.SetEnvironmentVariable;
 import org.mockito.Mockito;
 
 class EndpointContextTest {
@@ -339,6 +340,7 @@ void endpointContextBuild_gdchFlow_noUniverseDomain_customEndpoint() throws IOEx
   // For this test running locally or in CI, check that the Env Var is set properly.
   // This test should only run when the maven profile `EnvVarTest` is enabled.
   @Test
+  @SetEnvironmentVariable(key = "GOOGLE_CLOUD_UNIVERSE_DOMAIN", value = "random.com")
   void endpointContextBuild_universeDomainEnvVarSet() throws IOException {
     String envVarUniverseDomain = "random.com";
     EndpointContext endpointContext =
@@ -354,9 +356,9 @@ void endpointContextBuild_universeDomainEnvVarSet() throws IOException {
   // For this test running locally or in CI, check that the Env Var is set properly.
   // This test should only run when the maven profile `EnvVarTest` is enabled.
   @Test
+  @SetEnvironmentVariable(key = "GOOGLE_CLOUD_UNIVERSE_DOMAIN", value = "random.com")
   void endpointContextBuild_multipleUniverseDomainConfigurations_clientSettingsHasPriority()
       throws IOException {
-    // This test has `GOOGLE_CLOUD_UNIVERSE_DOMAIN` = `random.com`
     String clientSettingsUniverseDomain = "clientSettingsUniverseDomain.com";
     EndpointContext endpointContext =
         defaultEndpointContextBuilder

gax-java/pom.xml

@@ -205,6 +205,12 @@
       </exclusions>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.junit-pioneer</groupId>
+      <artifactId>junit-pioneer</artifactId>
+      <version>2.2.0</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>