Dropbox java api - can't use hebrew string

Question

I try to to create DbxEntry object with path that include hebrew character and it's doesn't work. It's gives me "nullPointerException", Here is example of the code i try to run with main function:

public static void example(String s) throws IOException, DbxException{
    auth();
    DbxEntry a = client.getMetadata(s);
    System.out.println(a.name);
}

public static void main(String [] args) throws IOException, DbxException{
    System.out.println("First example: ");
    example("/Public");
    System.out.println("Working..");

    System.out.println("Second example: ");
    example("/לשום");
}

The output is: First example: Linked account: Itay Velner Public Working.. Second example: Linked account: Itay Velner

Exception in thread "main" java.lang.NullPointerException
    at node.Main.example(Main.java:137)
    at node.Main.main(Main.java:145)

I tried to look for help in the web and i doesn't find anything yet. if i convert the hebrew String into unicode it's still doesn't work. I think that there is some problem with the api,

any thoughts?

Thanks, Itay.