Simple Dynamic attach not found

Hi Rafael,

I have the same 3 classes last https://github.com/raphw/byte-buddy/issues/643 very simple, but this time, I use the agentmain due to the jframe already in full execution.

I am using jdk 8, with the tools.jar in the classpath

public static void agentmain(final String args, Instrumentation inst) {
        System.out.print("agent main");
        new AgentBuilder.Default()
                .ignore(ElementMatchers.none())
                .disableClassFormatChanges()
                .with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)
                .with(AgentBuilder.Listener.StreamWriting.toSystemOut())
                .type((ElementMatchers.nameContains("Usuario")))
                .transform((builder, typeDescription, classLoader, module) ->
                        builder.visit(Advice.to(MoreLifeAdvice.class)
                                .on(ElementMatchers.isConstructor()))
                )
                .installOn(inst);
    }

MoreLifeAdvice

public class MoreLifeAdvice {

    @Advice.OnMethodExit
    static void giveMeMoreLife(@Advice.FieldValue(value = "life", readOnly = false) int life)
    throws Exception {
        System.out.println("New life set to 1000");
        life = 1000;
    }

}

Launcher

public static void main( String[] args ) {

        final Path path = getFile(null,JFileChooser.FILES_ONLY);

        ByteBuddyAgent.attach(path.toFile(),"pid");
    }

No exception is thrown And the field x is not modified

Yesterday I was able to verify that the Advice is not executed

Thanks for the help provided.

[rucko24]

My lord, how class of bytebuddy API , helps me?

I’m going crazy now. Damn lmao.

I should be use bytebuddy API right?

[raphw]

You would need to check when your constructor is called and when your agent is attached. If the latter happens before the former, the field value will mot have changed.