Why does my Hashtable with string keys not work as expected in MATLAB?

I have the following code in Java:

Hashtable hash =new Hashtable();

hash.put("a", "aa");

hash.put("b", "bb");

I then pass that object back to MATLAB and try to access those elements in the Hashtable:

hash

a=hash.get('a')

b=hash.get('b')

hash.put('d','dddddd');

Answer 1

[MathWorks Support Team]

This is due to how MATLAB converts the strings to Java Objects.

The workaround is to explicitly convert the MATLAB strings to the java.lang.String class.