Question how to Modify static variable through an Agent with AgentBuilder

Hi Rafael, great api

The Main Class , very simple

user.getLife () returns 10

public class ReflectionOnClass extends JFrame {


    private static MyProgram2 user = new MyProgram2();
    private JLabel jLabel = new JLabel("X: ");

    public ReflectionOnClass() {
        jLabel.setText("X: " + user.getLife()); // return 10
        setLayout(new FlowLayout());
        setPreferredSize(new Dimension(200, 200));
        add(jLabel);
        setDefaultCloseOperation(3);
        setLocationRelativeTo(null);
        pack();
        setVisible(true);
    }

    public static void main(String ...blablabla) {
        new Thread(ReflectionOnClass::new).start();
    }
}

public class MyProgram2 {

    private static Usuario USUARIO = new Usuario();

    public MyProgram2() {}

    public int getLife() {
        return USUARIO.getLife();
    }

}

public class Usuario {

    private int life= 10;

    public Usuario() {

    }

    public int getLife() {
        return life;
    }
    @Override
    public String toString() {
        return "Hi";
    }

}

The Usuario class contains the value that is assigned to JLabel, how could that value change with instrumentation through an Agent?

I need to know which test that you have created could help me to make the modification in runtime.

[rucko24]

Funciona perfecto jefe. Works perfectly boss thanks a lot.

Something happened to me with the project generated in see apparently. the target.jar has a new pom.xml

Boss like that also worked wtf, I had an error in the construction of my project. omggg

   public static void premain(String param, Instrumentation inst) {
        System.out.println("Give more life please!!!");

        new AgentBuilder.Default()
                .with(new AgentBuilder.InitializationStrategy.SelfInjection.Eager())
                .with(AgentBuilder.InstallationListener.StreamWriting.toSystemOut())
                .type((ElementMatchers.nameContains("Usuario")))
                .transform((builder, typeDescription, classLoader, module) ->
                        builder.visit(Advice.to(MoreLifeAdvice.class)
                                .on(ElementMatchers.isConstructor()))
                )
                .installOn(inst);
    }

This is the structure of my project, with the manifest I do not know if that was what I lacked.

[raphw]

Try with a regular listener, not an installation listener:

AgentBuilder.Listener.StreamWriting.toSystemOut()