chore: log class instrumentation

Author: javier-godoy

src/main/java/com/flowingcode/vaadin/jsonmigration/ClassInstrumentationUtil.java

@@ -42,6 +42,8 @@
 import org.objectweb.asm.MethodVisitor;
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.Type;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Utility class for instrumenting classes at runtime.
@@ -57,6 +59,8 @@
  */
 final class ClassInstrumentationUtil {
 
+  private final Logger logger = LoggerFactory.getLogger(this.getClass());
+
   private final int version;
 
   private final Map<ClassLoader, InstrumentedClassLoader> classLoaderCache = new WeakHashMap<>();
@@ -115,6 +119,7 @@ public <T extends Component> Class<? extends T> instrumentClass(Class<T> parent)
     }
 
     if (!needsInstrumentation(parent)) {
+      logger.info("{} no instrumentation needed", parent);
       return parent;
     }
 
@@ -362,6 +367,8 @@ private void createLookupHelper(ClassWriter cw, Method method) {
     }
 
     private void generateMethodOverride(ClassWriter cw, Method method, String internalClassName, String internalParentName) {
+      logger.info("Override {}", method);
+
       boolean hasJsonValueReturn = !hasLegacyVaadin() && JsonValue.class.isAssignableFrom(method.getReturnType());
       boolean hasJsonValueParams = !hasLegacyVaadin() && hasJsonValueParameters(method);