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Thank you for your answer

My principal object is to save in the file processdefinition.xml i didn't use the same method of you here is my code :

import org.jbpm.bpmn2.xml.XmlBPMNProcessDumper;

import org.jbpm.graph.def.ProcessDefinition;

import org.jbpm.workflow.core.impl.WorkflowProcessImpl;

public class ProcessTest

{

public static void main(String[] args)

   {

      System.out.println("Start ");

      ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("processdefinition.xml");

    System.out.println("before modification");

    System.out.println(processDefinition.getName());

    processDefinition.setName("My second name");

    System.out.println("before modification");

    System.out.println(processDefinition.getName());

   // now i try to persist this modification in my processdefinition.xml

    WorkflowProcessImpl process= new WorkflowProcessImpl();

    process.getMetaData();

    //process.getMetaData("processdefinition.xml");

    System.out.println(XmlBPMNProcessDumper.INSTANCE.dump(process, XmlBPMNProcessDumper.NO_META_DATA));

    System.out.println(processDefinition.getName());

   This is my class but i didnt knew why we are not using the same syntax, we have two different code but we are using the same API and i guess the same object.

   I will explain to you: I have the processdefinition.xml file i want to save any changes related to the process in this file so do you have any ideas or any suggestion 

Thanks