Why are String parameters always null in a Spring Boot 1.5 @Controller?

Question

I migrated a Spring 4.1 application (running I JBoss) to SpringBoot 1.5 (Spring 4.3.7), and after that, all our MVC Controllers with String parameters always receive null values when called.

The only way I could get the parameter value set was to replace String with StringBuilder.

An example, not working anymore:

@RequestMapping(value = "/updateTime", method = RequestMethod.POST)
public String updateTime(@RequestParam(value="time") String time) {
  // time is null in SpringBoot
}

Working (StringBuffer instead of String:

@RequestMapping(value = "/updateTime", method = RequestMethod.POST)
public String updateTime(@RequestParam(value="time") StringBuffer time) {
  // time has expected value
}

HTML:

<form name="updateTime" action="updateTime.html" method="post">
    Time: <input type="text" name="time" placeholder="YYYY-MM-DD HH:mm" value="${time}"/> <br/>
    <input type="submit" name="action" value="   Update   "/>
</form>

Even when String parameters in the controller are compounded into a request object I get this behaviour.

Am I doing something wrong here?

Answer 1

INFO : Spring Works with HTML name attributes. You should have the same name and RequestParam value. Note : in the HTML form action it's better to have the same as the RequestMapping value also. Try this :

<form name="updateTime" action="/updateTime" method="post">
    Time: <input type="text" name="time" placeholder="YYYY-MM-DD HH:mm" value="${time}"/> <br/>
    <input type="submit" name="action" value="   Update   "/>
</form>

@RequestMapping(value = "/updateTime", method = RequestMethod.POST)
public String updateTime(@RequestParam(value="time") String time) {
  // time is null in SpringBoot
}