RequestParam can't properly parse an optional boolean parameter [SPR-5410]

[spring-projects-issues]

Scott Battaglia opened SPR-5410 and commented

I'm using the Spring MVC's annotation-based support and specified a method signature as follows:

public void validateCas10Request(@RequestParam(value="renew",required=false) final boolean renew, @RequestParam(value="service",required=true) final String service, @RequestParam(value="ticket",required=true) final String ticket, final Writer writer) {

If I do not have a renew request parameter the following error is thrown:
java.lang.IllegalStateException: Optional boolean parameter 'renew' is not present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.

Is there a reason that a null parameter is not converted to false, as per the JavaDoc's parseBoolean method for Boolean?
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Boolean.html#parseBoolean(java.lang.String)

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Affects: 2.5.6

[spring-projects-issues]

Scott Battaglia commented

This can be alleviated with:
http://jira.springframework.org/browse/SPR-5237

But again, the javadoc for Boolean says that if you call parseBoolean, a null is essentially false.

[spring-projects-issues]

Juergen Hoeller commented

Good point - it makes sense to fall back to "false" for such an optional boolean parameter. Supported as of 3.0 M2.

Juergen