Error on null body with non-nullable controller parameters.

[Foxcapades]

If the controller is developed in kotlin and does not allow null parameters there is a server error on null request body.

The plugin should detect when the controller method parameter is non nullable and reject empty requests with a 400.

{
    "status": "server-error",
    "message": "Parameter specified as non-null is null: method org.veupathdb.service.mblast.query.controller.JobsController.postJobs, parameter entity",
    "requestId": "41kSB9ZqT9EtSnwGVzPNpP"
}

2022-10-14 11:57:42.389 [rid:41kSB] WARN  ErrorMapper:64 - Caught Exception: 
 java.lang.NullPointerException: Parameter specified as non-null is null: method org.veupathdb.service.mblast.query.controller.JobsController.postJobs, parameter entity
        at org.veupathdb.service.mblast.query.controller.JobsController.postJobs(JobsController.kt) ~[service.jar:2.0.0]
        at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:577) ~[?:?]
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:134) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:177) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:176) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:81) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:478) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:400) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:255) ~[service.jar:2.0.0]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248) ~[service.jar:2.0.0]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244) ~[service.jar:2.0.0]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:292) ~[service.jar:2.0.0]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:274) ~[service.jar:2.0.0]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:244) ~[service.jar:2.0.0]
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:234) ~[service.jar:2.0.0]
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:684) ~[service.jar:2.0.0]
        at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:356) ~[service.jar:2.0.0]
        at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:190) ~[service.jar:2.0.0]
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:535) ~[service.jar:2.0.0]
        at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:515) ~[service.jar:2.0.0]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]