Fix: jvm downgrad(21 -> 17)

build.gradle

@@ -8,7 +8,7 @@ version = '0.0.1-SNAPSHOT'
 
 java {
     toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
+        languageVersion = JavaLanguageVersion.of(17)
     }
 }
 

src/test/java/com/currenjin/wharf/detector/MySQLServiceDetectorTest.java

@@ -22,7 +22,7 @@ void detectMySQLFromGradle(@TempDir Path tempDir) throws Exception {
 		List<Service> services = detector.detect(tempDir);
 
 		assertThat(services).hasSize(1);
-		assertThat(services.getFirst())
+		assertThat(services.get(0))
 			.satisfies(mysql -> {
 				assertThat(mysql.getName()).isEqualTo("mysql");
 				assertThat(mysql.getVersion()).isEqualTo("8.0");

src/test/java/com/currenjin/wharf/detector/PostgreSQLServiceDetectorTest.java

@@ -22,7 +22,7 @@ void detectPostgreSQLFromGradle(@TempDir Path tempDir) throws Exception {
 		List<Service> services = detector.detect(tempDir);
 
 		assertThat(services).hasSize(1);
-		assertThat(services.getFirst())
+		assertThat(services.get(0))
 			.satisfies(postgresql -> {
 				assertThat(postgresql.getName()).isEqualTo("postgresql");
 				assertThat(postgresql.getVersion()).isEqualTo("15.0");

src/test/java/com/currenjin/wharf/detector/RabbitMQServiceDetectorTest.java

@@ -23,7 +23,7 @@ void detectRabbitMQFromGradle(@TempDir Path tempDir) throws Exception {
 		List<Service> services = detector.detect(tempDir);
 
 		assertThat(services).hasSize(1);
-		assertThat(services.getFirst())
+		assertThat(services.get(0))
 			.satisfies(rabbitmq -> {
 				assertThat(rabbitmq.getName()).isEqualTo("rabbitmq");
 				assertThat(rabbitmq.getVersion()).isEqualTo("3.12");

src/test/java/com/currenjin/wharf/detector/RedisServiceDetectorTest.java

@@ -24,7 +24,7 @@ void detectRedisFromGradle(@TempDir Path tempDir) throws Exception {
 		List<Service> services = detector.detect(tempDir);
 
 		assertThat(services).hasSize(1);
-		assertThat(services.getFirst())
+		assertThat(services.get(0))
 			.satisfies(redis -> {
 				assertThat(redis.getName()).isEqualTo("redis");
 				assertThat(redis.getVersion()).isEqualTo("7.0");