fix

Author: zeitlinger

instrumentation/spring/spring-web/spring-web-3.1/library/src/main/java/io/opentelemetry/instrumentation/spring/web/v3_1/SpringWebHttpAttributesGetter.java

@@ -61,11 +61,11 @@ enum SpringWebHttpAttributesGetter
 
     // since spring web 7.0
     MethodHandle methodHandle =
-        findGetHeadersMethod(MethodType.methodType(List.class, String.class, List.class));
+        findGetHeadersMethod(MethodType.methodType(List.class, String.class));
     if (methodHandle == null) {
       // up to spring web 7.0
       methodHandle =
-          findGetHeadersMethod(MethodType.methodType(Object.class, Object.class, Object.class));
+          findGetHeadersMethod(MethodType.methodType(List.class, Object.class));
     }
     GET_HEADERS = methodHandle;
 
@@ -74,7 +74,7 @@ enum SpringWebHttpAttributesGetter
 
   private static MethodHandle findGetHeadersMethod(MethodType methodType) {
     try {
-      return MethodHandles.lookup().findVirtual(HttpHeaders.class, "getOrDefault", methodType);
+      return MethodHandles.lookup().findVirtual(HttpHeaders.class, "get", methodType);
     } catch (Throwable t) {
       return null;
     }
@@ -100,7 +100,11 @@ public List<String> getHttpRequestHeader(HttpRequest httpRequest, String name) {
   private static List<String> getHeader(HttpHeaders headers, String name) {
     if (GET_HEADERS != null) {
       try {
-        return (List<String>) GET_HEADERS.invoke(headers, name, emptyList());
+        List<String> result = (List<String>) GET_HEADERS.invoke(headers, name);
+        if (result == null) {
+          return emptyList();
+        }
+        return result;
       } catch (Throwable t) {
         System.out.println("error getting headers " + t.getMessage());
         t.printStackTrace();

instrumentation/spring/spring-web/spring-web-3.1/library/src/main/resources/META-INF/native-image/io.opentelemetry.instrumentation/spring-web-3.1/reflect-config.json

@@ -31,11 +31,20 @@
     "methods": [
       {
         "name": "getOrDefault",
-        "parameterTypes": ["java.lang.String", "java.util.List"]
+        "parameterTypes": ["java.lang.Object", "java.lang.Object"]
+      }
+    ]
+  },
+  {
+    "name": "org.springframework.http.HttpHeaders",
+    "methods": [
+      {
+        "name": "get",
+        "parameterTypes": ["java.lang.Object"]
       },
       {
         "name": "getOrDefault",
-        "parameterTypes": ["java.lang.Object", "java.lang.Object"]
+        "parameterTypes": ["java.lang.String", "java.util.List"]
       }
     ]
   }

mise.toml

@@ -1,5 +1,5 @@
 [tools]
-java = "graalvm-community-25.0.0"
+java = "graalvm-community-25.0.1"
 lychee = "0.21.0"
 
 [settings]