hello Manuel, thank you for your answer. The problem is solved now. but I made a modification since the original code you gave me did not work. your code throws the following exception:
java.lang.ClassCastException: com.sun.faces.context.ExternalContextImpl cannot be cast to javax.servlet.ServletContext
so I used the folowing line to get the real path of my root:
String path = FacesContext.getCurrentInstance().getExternalContext().getRealPath("/");
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