Find .conf file next to symlink to jar that's using the launch script

See gh-8988

spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/java/org/springframework/boot/launchscript/SysVinitLaunchScriptIT.java

@@ -59,6 +59,7 @@ import static org.junit.Assume.assumeThat;
  * Integration tests for Spring Boot's launch script on OSs that use SysVinit.
  *
  * @author Andy Wilkinson
+ * @author Ali Shahbour
  */
 @RunWith(Parameterized.class)
 public class SysVinitLaunchScriptIT {
@@ -194,6 +195,12 @@ public class SysVinitLaunchScriptIT {
 		doLaunch("launch-with-single-java-opt.sh");
 	}
 
+	@Test
+	public void launchWithDoubleLinkSingleJavaOpt() throws Exception {
+		doLaunch("launch-with-double-link-single-java-opt.sh");
+	}
+
+
 	@Test
 	public void launchWithMultipleJavaOpts() throws Exception {
 		doLaunch("launch-with-multiple-java-opts.sh");

spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/scripts/launch-with-double-link-single-java-opt.sh

@@ -0,0 +1,6 @@
+source ./test-functions.sh
+install_double_link_service
+echo 'JAVA_OPTS=-Dserver.port=8081' > /test-service/spring-boot-app.conf
+start_service
+await_app http://127.0.0.1:8081/
+curl -s http://127.0.0.1:8081/

spring-boot-integration-tests/spring-boot-launch-script-tests/src/test/resources/scripts/test-functions.sh

@@ -5,6 +5,14 @@ install_service() {
   ln -s /test-service/spring-boot-app.jar /etc/init.d/spring-boot-app
 }
 
+install_double_link_service() {
+  mkdir /test-service
+  mv /spring-boot-launch-script-tests-*.jar /test-service/
+  chmod +x /test-service/spring-boot-launch-script-tests-*.jar
+  ln -s /test-service/spring-boot-launch-script-tests-*.jar /test-service/spring-boot-app.jar
+  ln -s /test-service/spring-boot-app.jar /etc/init.d/spring-boot-app
+}
+
 start_service() {
   service spring-boot-app start $@
 }