Review fixes for spring-web-3.1:library (open-telemetry#17744)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Author: otelbot[bot]

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

@@ -38,7 +38,7 @@ private static MethodHandle firstAvailableHandle(
   private static MethodHandle findGetHeadersMethod(MethodType methodType) {
     try {
       return MethodHandles.lookup().findVirtual(HttpHeaders.class, "get", methodType);
-    } catch (Throwable t) {
+    } catch (Throwable ignored) {
       return null;
     }
   }
@@ -51,7 +51,7 @@ static List<String> getHeader(HttpHeaders headers, String name) {
         if (result != null) {
           return result;
         }
-      } catch (Throwable t) {
+      } catch (Throwable ignored) {
         // ignore
       }
     }

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

@@ -63,7 +63,6 @@ public String getHttpRequestMethod(HttpRequest httpRequest) {
   }
 
   @Override
-  @Nullable
   public String getUrlFull(HttpRequest httpRequest) {
     return httpRequest.getURI().toString();
   }