avoid stack overflow with proxy

Author: SylvainJuge

instrumentation/spring/spring-webmvc/spring-webmvc-3.1/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/webmvc/v3_1/SpringWebMvcInstrumentationModule.java

@@ -30,6 +30,12 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
     return hasClassesNamed("javax.servlet.Filter");
   }
 
+  @Override
+  public boolean isHelperClass(String className) {
+    // filter on prefix due to inner classes
+    return className.startsWith("org.springframework.web.servlet.v3_1.OpenTelemetryHandlerMappingFilter");
+  }
+
   @Override
   public void injectClasses(ClassInjector injector) {
     injector

instrumentation/spring/spring-webmvc/spring-webmvc-6.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/webmvc/v6_0/SpringWebMvcInstrumentationModule.java

@@ -30,6 +30,12 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
     return hasClassesNamed("jakarta.servlet.Filter");
   }
 
+  @Override
+  public boolean isHelperClass(String className) {
+    // filter on prefix due to inner classes
+    return className.startsWith("org.springframework.web.servlet.v6_0.OpenTelemetryHandlerMappingFilter");
+  }
+
   @Override
   public void injectClasses(ClassInjector injector) {
     injector