talend在运行时如何处理作业的修改?

As I know when we create a project in talend, it creates three files namely project_name.item, project_name.properties and project_name.java. When we add a component to the project, the parameters for that component is taken from the component_java.xml file. When we specify the parameter values for that component and save the job, it will be automatically added in the item file. For example a typical _java.xml file for tMap component looks like this.As I know when we create a project in talend, i