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MockMvc doesn't honor params in RequestMapping when no equal sign [SPR-15831] #20386

spring-projects-issues opened this issue Jul 29, 2017 · 1 comment
in: core type: enhancement


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spring-projects-issues commented Jul 29, 2017

Jean-Baptiste Nizet opened SPR-15831 and commented

When two resource methods are defined as following:

    public String noParam() {
        return "noParam";

    @GetMapping(params = "foo")
    public String paramFoo() {
        return "paramFoo";

and a MockMvc test tries executing the second method using


then the first method is invoked instead. Adding an equal sign at the end fixes the issue, but the equl sign shouldn't be necessary. BTW, in production, sending a request to /api/bug?foo does invoke the second method as expected.

Here's a repro project:

Note that the original bug has been detected in a Spring Boot 2.0.0.M2 project, so the bug is still there in the latest version of Spring.

Affects: 4.3.10, 5.0 RC3

Referenced from: commits 4fc0ce1

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spring-projects-issues commented Aug 1, 2017

Rossen Stoyanchev commented

It looks like Servlet containers (at least current Tomcat and Jetty) do not differentiate between empty value ("foo=") and no value ("foo") and always return an empty value.

In the Spring Framework however we do and always have. In this case UriComponentsBuilder parses "foo" as a parameter with a null value, MockHttpServletRequestBuilder preserves that distinction, MockHttpServletRequest stores it as a String[] with one null value, and at request time ParamsRequestCondition calls WebUtils.hasSubmitParameter(request, name) which does request.getParameter(name) != null and that is null.

I am not sure whether the Servlet container behavior has changed over time or this simply hasn't surfaced until now. I could not find anything the Servlet spec and API that talks about empty parameter values.

We could make an improvement in ParamsRequestCondition to perform the name-only match via request.getParameterMap().contains(name). One could argue that WebUtils.hasSubmitParameter is fine as it is since a submit parameter is a more specific use case for a browser form button.

@spring-projects-issues spring-projects-issues added type: enhancement in: core labels Jan 11, 2019
@spring-projects-issues spring-projects-issues added this to the 5.0 RC4 milestone Jan 11, 2019
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