I'm using Bozho solution to create a session attribute annotation under Spring mvc.
I've a problem when the object is not in the session and I've something like
@SessionAttribute(required = false) MyFormObject myFormObject
The annotation is defined as
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface SessionAttribute {
String value() default "";
boolean required() default true;
String defaultValue() default ValueConstants.DEFAULT_NONE;
}
I get an exception since defaultValue()
returns a String
and my custom ArgumentResolver
tries to assign this String
to MyFormObject
.
How can I instruct Spring to assign null
to myFormObject
instead of ValueConstants.DEFAULT_NONE
?
您不能简单地修改自定义WebArgumentResolver
以在找不到属性时返回null
而不是defaultValue
吗?
the defaultValue
can be the username of the user, which you can find by injecting a dao into the resolver. But having a default user doesn't make much sense anyway, so just return null
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