Which method gets called for below request mapping? - spring

Question

Among the below two methods, which one gets called first?
#RequestMapping(method = RequestMethod.POST, params="continue")
public String save(){
}
#RequestMapping(method = RequestMethod.POST, params="continuesave")
public String saveReview(){
}
Params sent in POST request include:
continue,
continuesave="true"
In my local machine, method 1 gets called. But in our prod servers, method 2 is getting called. What is the method calling criteria?

Answer 1

When I try to run your example, I get an exception java.lang.IllegalStateException: Ambiguous handler methods mapped
By the way, you can change the priority of handlers by negating params(saveReview won't call for both params):
#RequestMapping(method = RequestMethod.POST, params="continue")
public String save(){
...
}
#RequestMapping(method = RequestMethod.POST, params={"continuesave"," !continue"})
public String saveReview(){
...
}

Answer 2

You should only map to non overlapping urls. What happens in you case is just undefined behaviour: it may depends on many things and cannot be securely predicted (it even throws an exception in #Dekart test).
Here if both params can be simultaneously present in a request you should have only one mapping and test for the parameters inside the controller method:
#RequestMapping(method = RequestMethod.POST)
public String save_req(WebRequest web) {
Map<String,String[]> param = web.getParameterMap();
if (...) { // condition for save
return save();
}
else {
saveReview();
}
}
public String save(){
}
public String saveReview(){
}