REST Services, Jersey Implementation, 404 Not Found Issue

Have been working with Jersey Implementation, jsr311-api-1.1.1.jar.  Had a service defined:

    @GET
    @Produces( { "application/json" })   
    public SomeService getSomethings(
            @Context SecurityContext securityContext
            , @QueryParam. . .  . . .  . . .
            , @QueryParam. . .  . . .  . . .
            , @QueryParam("someNumber") Integer someNumber            , @QueryParam. . .  . . .  . . .
            , @QueryParam. . .  . . .  . . .) {

            . . .  . . .  . . .
            . . .  . . .  . . .

    }

For some reason some part of the application was passing the parameter someNumber=true.  This was resulting 404 error code, very generic error code.  After spending a couple of hours trying to troubleshoot the issue, figured out that the parameter someNumber=true was causing the 404 error code.  Then changed the method signature to: 

    @GET
    @Produces( { "application/json" })   
    public SomeService getSomethings(
            @Context SecurityContext securityContext
            , @QueryParam. . .  . . .  . . .
            , @QueryParam. . .  . . .  . . .
            , @QueryParam("sampleSetNumber") String someNumber            , @QueryParam. . .  . . .  . . .
            , @QueryParam. . .  . . .  . . .) {

            . . .  . . .  . . .
            . . .  . . .  . . .


    }
and the error 404 disappeared.  Does this suggest that Jersey Implementation of REST services require request parameters to match the signature?

Any REST validation tools?  or any debugging tools?