I made a simple project of java to test ByteBuddy . I typed exactly the same code in a tutorial made by Rafael Winterhalter but it showing some errors
1) ByteBuddyAgent cannot be resolved.
2) type cannot be resolved to a variable.
3) builder cannot be resolved.
4) method cannot be resolved to a variable.
I added the byte-buddy-1.7.1.jar as a referenced library.
public class LogAspect {
public static void main(String[] args){
premain("", ByteBuddyAgent.installOnOpenJDK());
Calculator calculator = new Calculator();
int sum = calculator.sum(10, 15, 20);
System.out.println("Sum is "+ sum);
}
public static void premain(String arg, Instrumentation inst){
new AgentBuilder.Default()
.rebase(type -> type.getSimpleName().equals("Calculator"))
.transform((builder, typeDescription) -> builder
.method(method -> method.getDeclaredAnnotations().isAnnotationPresent(Log.class))
.intercept(MethodDelegation.to(LogAspect.class).andThen(SuperMethodCall.INSTANCE)))
.installOn(inst);
}
public static void intercept(@Origin Method method){
System.out.println(method.getName()+" is called.");
}
}
@interface Log{
}
class Calculator {
@Log
public int sum(int... values) {
return Arrays.stream(values).sum();
}
}
