Problem with passing config as part of karate.callSingle()

Hello there, As described on stackoverflow issue I am getting unexpected errors when trying to pass a config item to a feature file I call from callSingle() in karate-config.js.

myproject.zip

Error I’m getting:

mvn clean test
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building myproject version
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ myproject ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ myproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /Users/flisowski/karate/myproject/src/main/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.6.0:compile (default-compile) @ myproject ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ myproject ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 4 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.6.0:testCompile (default-testCompile) @ myproject ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to /Users/flisowski/karate/myproject/target/test-classes
[INFO]
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ myproject ---
[INFO] Surefire report directory: /Users/flisowski/karate/myproject/target/surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running examples.ExamplesTest
16:41:20.026 [main] INFO  com.intuit.karate - karate.env system property was: null
16:41:20.036 [main] INFO  com.intuit.karate - >> lock acquired, begin callSingle: classpath:examples/users/users.feature
16:41:20.041 [main] ERROR com.intuit.karate - javascript function call failed: unexpected feature call arg type: class jdk.nashorn.internal.scripts.JO4
16:41:20.042 [main] ERROR com.intuit.karate - failed function body: function() {
  var env = karate.env; // get system property 'karate.env'
  karate.log('karate.env system property was:', env);
  if (!env) {
    env = 'dev';
  }
  var config = {
    env: env,
	myVarName: 'someValue'
  }
  if (env == 'dev') {
    // customize
    // e.g. config.foo = 'bar';
  } else if (env == 'e2e') {
    // customize
  }

////  That works
//  var result = karate.callSingle('classpath:examples/users/users.feature');

////  That does not
  var result = karate.callSingle('classpath:examples/users/users.feature', config);
  karate.log(result);

  return config;
}
16:41:20.042 [main] ERROR com.intuit.karate - evaluation of 'karate-config.js' failed: javascript function call failed: unexpected feature call arg type: class jdk.nashorn.internal.scripts.JO4
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.782 sec <<< FAILURE!
examples.ExamplesTest  Time elapsed: 0.781 sec  <<< ERROR!
java.lang.NullPointerException
	at com.intuit.karate.core.ScenarioExecutionUnit.init(ScenarioExecutionUnit.java:147)
	at com.intuit.karate.core.ScenarioExecutionUnit.run(ScenarioExecutionUnit.java:236)
	at com.intuit.karate.core.FeatureExecutionUnit.run(FeatureExecutionUnit.java:164)
	at com.intuit.karate.core.FeatureExecutionUnit.run(FeatureExecutionUnit.java:73)
	at com.intuit.karate.junit4.Karate.runChild(Karate.java:125)
	at com.intuit.karate.junit4.Karate.runChild(Karate.java:56)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at com.intuit.karate.junit4.Karate.run(Karate.java:133)
	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
	at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
	at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)


Results :

Tests in error:
  examples.ExamplesTest

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.305 s
[INFO] Finished at: 2019-07-04T16:41:20+01:00
[INFO] Final Memory: 17M/254M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.12.4:test (default-test) on project myproject: There are test failures.
[ERROR]
[ERROR] Please refer to /Users/user/karate/myproject/target/surefire-reports for the individual test results.
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

[flisowski]

@ptrthomas I’ve updated my maven, and jdk8 to the latest release before I had a chance to try your workaround - it works now. Must have been something to do with the older version, most likely related to the issue you pointed out on stackoverflow. Running same debug, I can see the passed callArg is jdk.nashorn.api.scripting.ScriptObjectMirror.

Thank you for your support!

[ptrthomas]

@flisowski thanks for the update !