I will change the below string constants from the given code by declaring the required variable in this ExpressionEncryptor class [ExpressionEncryptor.java].

~~~

boolean hasDefaultResolver = result.hasDefined("default-resolver");
               

    void saveEncryption(ModelNode payload) {

        Operation operation = new Operation.Builder(EXPRESSION_ADDRESS, "create-expression")
                .payload(payload)
                .build();

~~~