diff --git a/asm/src/main/java/com/baeldung/examples/asm/instrumentation/Premain.java b/asm/src/main/java/com/baeldung/examples/asm/instrumentation/Premain.java
index 105d7227d5..a3e69b6785 100644
--- a/asm/src/main/java/com/baeldung/examples/asm/instrumentation/Premain.java
+++ b/asm/src/main/java/com/baeldung/examples/asm/instrumentation/Premain.java
@@ -1,19 +1,32 @@
 package com.baeldung.examples.asm.instrumentation;
 
 import com.baeldung.examples.asm.CustomClassWriter;
-
+import java.lang.instrument.ClassFileTransformer;
+import java.lang.instrument.IllegalClassFormatException;
 import java.lang.instrument.Instrumentation;
+import java.security.ProtectionDomain;
 
+/**
+ *
+ * @author baeldung
+ */
 public class Premain {
 
     public static void premain(String agentArgs, Instrumentation inst) {
-        inst.addTransformer((l, name, c, d, b) -> {
+        inst.addTransformer(new ClassFileTransformer() {
 
-            if (name.equals("java/lang/Integer")) {
-                CustomClassWriter cr = new CustomClassWriter(b);
-                return cr.addField();
+            @Override
+            public byte[] transform(ClassLoader l, String name, Class c,
+                    ProtectionDomain d, byte[] b)
+                    throws IllegalClassFormatException {
+
+                if (name.equals("java/lang/Integer")) {
+                    CustomClassWriter cr = new CustomClassWriter(b);
+                    return cr.addField();
+                }
+                return b;
             }
-            return b;
         });
     }
+
 }