How to set a Object value by JDI

Question

How to set a Object value using JDI?
For example:
class User{
  private String name;
  private String id;
set and get method;
public static void main(String[] args) throws Exception {
        VirtualMachineManager vmm = Bootstrap.virtualMachineManager();
        List<AttachingConnector> connectors = vmm.attachingConnectors();
        SocketAttachingConnector sac = null;
        for (AttachingConnector ac : connectors) {
            if (ac instanceof SocketAttachingConnector) {
                sac = (SocketAttachingConnector) ac;
                break;
        if (sac == null) {
            System.out.println("JDI error");
            return;
        Map<String, Connector.Argument> arguments = sac.defaultArguments();
        Connector.Argument hostArg = arguments.get("hostname");
        Connector.Argument portArg = arguments.get("port");
        hostArg.setValue(HOST);
        portArg.setValue(String.valueOf(PORT));
        vmMachine = sac.attach(arguments);
        List<ReferenceType> classesByName = vmMachine.classesByName(CLSNAME);
        if (classesByName == null || classesByName.size() == 0) {
            System.out.println("No class found");
            return;
        ReferenceType rt = classesByName.get(0);
        List<Method> methodsByName = rt.methodsByName(METHODNAME);
        if (methodsByName == null || methodsByName.size() == 0) {
            System.out.println("No method found");
            return;
        Method method = methodsByName.get(0);
I will connect to server and monitor the remote server JVM , There is a object of User, I want to change its value by the Java Debugger Interface by client.
so how to set its value by the client, and I can not got the User bean at client.
I know the basic type filed value changed as follows:
Value newValue = vmMachine.mirrorOf("change var value");// this field is a string.
stackFrame.thisObject().setValue(field, newValue);
But a Object , how can I change its value.
Thanks Advanced.

Answer 1

ObjectReference.setValue() is the method for chaining the value of an Object's field. First you need to find the specific Object you want to change, though.
/Staffan