User can enter whatever he want into "Themes on Page "

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Expected result: Themes on page is listbox, user can choose from this: 5, 10, 20, 50, 100, 250

Actual result: U can enter whatever you want into this field.
If you enter not numbers u will got exception: Failed to convert property value of type java.lang.String to required type int for property pageSize; nested exception is org.springframework.core.convert.ConversionFailedException: Unable to convert value "фы" from type java.lang.String to type int; nested exception is java.lang.NumberFormatException: For input string: "фы"