Question

In my feature file I have something like this:

  Scenario: Things
    Given the table is empty
    When I add a thing:
      |          Foo  |    Bar |      Baz |
      | 1293883200000 | 123.45 |   123456 |
      | 1293884100000 | 123.45 |   123456 |

Any ideas? Doing it wrong? Bug in cucumber-jvm?

It matches my step definition, but before actually executing the code inside of it, I get a null pointer exception:

java.lang.NullPointerException
    at cucumber.runtime.StepDefinitionMatch.getGenericListType(StepDefinitionMatch.java:144)
    at cucumber.runtime.StepDefinitionMatch.tableArgument(StepDefinitionMatch.java:135)
    at cucumber.runtime.StepDefinitionMatch.transformedArgs(StepDefinitionMatch.java:103)
    at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:43)
    at cucumber.runtime.Runtime.runStep(Runtime.java:220)
    at cucumber.runtime.model.StepContainer.runStep(StepContainer.java:44)
    at cucumber.runtime.model.StepContainer.runSteps(StepContainer.java:39)
    at cucumber.runtime.model.CucumberScenario.run(CucumberScenario.java:32)
    at cucumber.runtime.Runtime.run(Runtime.java:101)
    at cucumber.runtime.Runtime.run(Runtime.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:92)
    at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:30)
    at leiningen.cucumber.util$run_cucumber_BANG_.invoke(util.clj:48)
    at user$eval43.invoke(NO_SOURCE_FILE:1)
    at clojure.lang.Compiler.eval(Compiler.java:6465)
    at clojure.lang.Compiler.eval(Compiler.java:6455)
    at clojure.lang.Compiler.eval(Compiler.java:6431)
    at clojure.core$eval.invoke(core.clj:2795)
    at clojure.main$eval_opt.invoke(main.clj:296)
    at clojure.main$initialize.invoke(main.clj:315)
    at clojure.main$null_opt.invoke(main.clj:348)
    at clojure.main$main.doInvoke(main.clj:426)
    at clojure.lang.RestFn.invoke(RestFn.java:421)
    at clojure.lang.Var.invoke(Var.java:405)
    at clojure.lang.AFn.applyToHelper(AFn.java:163)
    at clojure.lang.Var.applyTo(Var.java:518)
    at clojure.main.main(main.java:37)
    at ✽.When I add a thing:(api.feature:9)

Answer 1

Looks like a bug in cucumber.runtime.StepDefinitionMatch where the code that deals with tabular data calls getGenericListType(int), which in turn dereferences StepDefinition#getParameterTypes().

Unfortunately, cucumber.runtime.clojure.ClojureStepDefinition#getParameterTypes() always returns null, thus resulting in the NPE.

I submitted an issue pointing to this question.