Review fixes for javalin-7.0:javaagent (#18028)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/javalin/javalin-7.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/javalin/v7_0/JavalinInstrumentation.java

@@ -5,6 +5,7 @@
 
 package io.opentelemetry.javaagent.instrumentation.javalin.v7_0;
 
+import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasClassesNamed;
 import static io.opentelemetry.javaagent.extension.matcher.AgentElementMatchers.hasSuperType;
 import static net.bytebuddy.matcher.ElementMatchers.isInterface;
 import static net.bytebuddy.matcher.ElementMatchers.named;
@@ -22,6 +23,11 @@
 
 class JavalinInstrumentation implements TypeInstrumentation {
 
+  @Override
+  public ElementMatcher<ClassLoader> classLoaderOptimization() {
+    return hasClassesNamed("io.javalin.http.Handler");
+  }
+
   @Override
   public ElementMatcher<TypeDescription> typeMatcher() {
     return hasSuperType(named("io.javalin.http.Handler")).and(not(isInterface()));