compatible different command line style for find jar path (#12544)

Author: misaya98

instrumentation/resources/library/src/main/java/io/opentelemetry/instrumentation/resources/MainJarPathFinder.java

@@ -44,9 +44,14 @@ Path detectJarPath() {
   @Nullable
   private Path getJarPathFromProcessHandle() {
     String[] javaArgs = getProcessHandleArguments.get();
-    for (int i = 0; i < javaArgs.length; ++i) {
-      if ("-jar".equals(javaArgs[i]) && (i < javaArgs.length - 1)) {
-        return Paths.get(javaArgs[i + 1]);
+    boolean jarOptionFound = false;
+    for (String javaArg : javaArgs) {
+      if ("-jar".equals(javaArg)) {
+        jarOptionFound = true;
+      } else if (jarOptionFound
+          && !javaArg.startsWith(
+              "-")) { // flags can appear between -jar and the jar path, ignore them
+        return Paths.get(javaArg);
       }
     }
     return null;

instrumentation/resources/library/src/test/java/io/opentelemetry/instrumentation/resources/JarServiceNameDetectorTest.java

@@ -73,6 +73,22 @@ void createResource_processHandleJar() {
         .containsEntry(ServiceAttributes.SERVICE_NAME, "my-service");
   }
 
+  @Test
+  void createResource_processHandleJarExtraFlag() {
+    String path = Paths.get("path", "to", "app", "my-service.jar").toString();
+    JarServiceNameDetector serviceNameProvider =
+        getDetector(
+            new String[] {"-Dtest=42", "-jar", "-Xmx512m", path, "abc", "def"},
+            prop -> null,
+            JarServiceNameDetectorTest::failPath);
+
+    Resource resource = serviceNameProvider.createResource(config);
+
+    assertThat(resource.getAttributes())
+        .hasSize(1)
+        .containsEntry(ServiceAttributes.SERVICE_NAME, "my-service");
+  }
+
   @Test
   void createResource_processHandleJarWithoutExtension() {
     JarServiceNameDetector serviceNameProvider =