Make java supplier return a value using side effect

Question

I have a java suppler that returns a Student pojo like so:

    @Bean
    public Supplier<Date> studentSupplier() {
        return () -> new Student();
    }

Now I want to make this supplier returns a Student pojo after an entry is created using api..something like so

    @RequestMapping(value = "/student",
        produces = { "application/json" }, 
        method = RequestMethod.POST)
    public ResponseEntity<Student> createStudent() {
        Student student = service.createStudent();
        return ResponseEntity.ok().body(student);
    }


    @Bean
    public Supplier<Student> studentSupplier() {
        return () -> {
        // How do I make this supplier return the Student pojo
        // created in above controller call? 
        };
    }

Please note I can't change the signature (for exmaple change Supplier to a Function).. The supplier interface is plugged into an external system that I can't control