What causes “java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'command' available as request attribute”?

Question

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I\'m trying to write a Spring MVC web applicati

Answer 1

I had this error on a screen with multiple forms that do a search. Each form posts to its own controller method with results shown on same screen.

Problem: I missed adding the other two forms as model attributes in each controller method causing that error when screen renders with results.

Form1 -> bound to Bean1 (bean1) -> Posting to /action1
Form2 -> bound to Bean2 (bean2) -> Posting to /action2
Form3 -> bound to Bean3 (bean2) -> Posting to /action3

@PostMapping
public String blah(@ModelAttribute("bean1") Bean1 bean, Model model){
// do something with bean object

// do not miss adding other 2 beans as model attributes like below. 
model.addAttribute("bean2", new Bean2()); 
model.addAttribute("bean3", new Bean3());
return "screen";
}

@PostMapping
public String blahBlah(@ModelAttribute("bean2") Bean2 bean, Model model){
// do something with bean object
// do not miss adding other 2 beans as model attributes like below. 
model.addAttribute("bean1", new Bean1()); 
model.addAttribute("bean3", new Bean3());
return "screen";
}

@PostMapping
public String blahBlahBlah(@ModelAttribute("bean3") Bean3 bean, Model model){
// do something with bean object
// do not miss adding other 2 beans as model attributes like below. 
model.addAttribute("bean1", new Bean1()); 
model.addAttribute("bean2", new Bean2());
return "screen";
}