Spring MVC: Failed to convert property value of type String to Integer

Question

My code looks like this

@RequestMapping(value = "/test2Form", method = RequestMethod.POST)
public String testForm(@ModelAttribute("someBean") SomeBean someBean, BindingResult result) {
    BindException errors = new BindException(someBean, "someBean");
    someValidator.validate(someBean, errors);

    for (FieldError error : errors.getFieldErrors()) {
        result.addError(new FieldError("someBean", error.getField(), error.getCode()));
    }

    // Field error
    if (result.hasErrors()) {
        return "test/test1";
    }

    return "index";
}

public class SomeBean{
    private Integer someInteger;
    // getter and setter
}

This works fine until the user changes the value via HTML to a non Integer value, e.g. like this: http://www.pichost.de/image/9IN

In this case a type mismatch occurs (something like Failed to convert property value of type java.lang.String to required type java.lang.Integer for property someInteger; nested exception is java.lang.NumberFormatException). I don't want to display this generated error message. Instead, I want to display only my error messages. Is this possible?

My JSP looks like this:

<form:form action="test2Form.htm" commandName="someBean" method="post">
    <form:select path="someInteger">
        <option value="1">Value 1</option>
        <option value="2">Value 2</option>
        <option value="3">Value 3</option>
    </form:select>
    <form:errors path="someInteger" element="div"/>

    <input type="submit" value="Submit">
</form:form>

What do you mean handle this properly? Spring has already handled it for you within the BindingResult. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Jun 17, 2015 at 14:51
That's true - but I don't want to display the error message generated from Spring (I want to display only the error messages I've added via someValidator). Is this possible? — baris1892
– baris1892, Commented Jun 17, 2015 at 14:53
You'll need to employ ExceptionHandling in your Java code to avoid these errors. Then you can offer the user your own custom error messages. — smoggers
– smoggers, Commented Jun 17, 2015 at 15:07
And what are you going to show? Binding didn't happen because it wasn't possible, so what are you going to show? Also it is quite a contraption you created, why are you constructing your own BindingResult? It would be easier to add @Valid to the method argument and use an @InitBinder method to set the validator, that way you save some code and use the default mechanism. — M. Deinum
– M. Deinum, Commented Jun 17, 2015 at 15:40
You can easily override the Failed to convert ... messages to anything you want. Take a look at this answer for details. — Bohuslav Burghardt
– Bohuslav Burghardt, Commented Jun 17, 2015 at 16:47

6ton · Accepted Answer · 2015-06-17 15:10:18Z

2

You can add an exception handler to you controller to handle NumberFormatExcpetion.

@ExceptionHandler(NumberFormatException.class) 
public String handleNumberFormatException(NumberFormatException e...) {
//add error for view here
}

answered Jun 17, 2015 at 15:10

6ton

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