Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: java.base doesn't "opens java.util" to unnamed module

Question

I have created a Cucumber feature file and steps file, then I have clicked "Run configurations" for feature file and I see the following in the console. How can I solve this problem?

*Feature: Login into account
  Existing user should be able to login to account using correct credentials
  
Scenario: Login into account with correct credentials     # C:/Users/MI/Desktop/CucumberFramework/CucumberFramework/src/test/java/CucumberFramework/featureFiles/Login.feature:4
    
Given User navigates to stackoverflow website           # LoginSteps.user_navigates_to_stackoverflow_website()
      java.lang.ExceptionInInitializerError
        at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters(XStream.java:820)
        at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:574)
        at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:530)
        at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.(LocalizedXStreams.java:50)
        at cucumber.runtime.xstream.LocalizedXStreams.newXStream(LocalizedXStreams.java:37)
        at cucumber.runtime.xstream.LocalizedXStreams.get(LocalizedXStreams.java:29)
        at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:37)
        at cucumber.runtime.Runtime.runStep(Runtime.java:300)
        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:44)
        at cucumber.runtime.model.CucumberFeature.run(CucumberFeature.java:165)
        at cucumber.runtime.Runtime.run(Runtime.java:122)
        at cucumber.api.cli.Main.run(Main.java:36)
        at cucumber.api.cli.Main.main(Main.java:18)
        at ✽.Given User navigates to stackoverflow website(C:/Users/MI/Desktop/CucumberFramework/CucumberFramework/src/test/java/CucumberFramework/featureFiles/Login.feature:5)
     
 Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: module java.base does not "opens java.util" to unnamed module @5afa04c
        at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
        at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
        at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:177)
        at java.base/java.lang.reflect.Field.setAccessible(Field.java:171)
        at cucumber.deps.com.thoughtworks.xstream.core.util.Fields.locate(Fields.java:39)
        at cucumber.deps.com.thoughtworks.xstream.converters.collections.TreeMapConverter.(TreeMapConverter.java:50)
        at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters(XStream.java:820)
        at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:574)
        at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:530)
        at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.(LocalizedXStreams.java:50)
        at cucumber.runtime.xstream.LocalizedXStreams.newXStream(LocalizedXStreams.java:37)
        at cucumber.runtime.xstream.LocalizedXStreams.get(LocalizedXStreams.java:29)
        at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:37)
        at cucumber.runtime.Runtime.runStep(Runtime.java:300)
        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:44)
        at cucumber.runtime.model.CucumberFeature.run(CucumberFeature.java:165)
        at cucumber.runtime.Runtime.run(Runtime.java:122)
        at cucumber.api.cli.Main.run(Main.java:36)
        at cucumber.api.cli.Main.main(Main.java:18)
    
And User clicks on the login button on homepage         # LoginSteps.user_clicks_on_the_login_button_on_homepage()
    
And User enters a valid username                        # LoginSteps.user_enters_a_valid_username()
    
And User enters a valid password                        # LoginSteps.user_enters_a_valid_password()
    
When User clicks on the login button                    # LoginSteps.user_clicks_on_the_login_button()
    
Then User should be taken to the successfull login page # LoginSteps.user_should_be_taken_to_the_successfull_login_page()

Failed scenarios:
C:/Users/MI/Desktop/CucumberFramework/CucumberFramework/src/test/java/CucumberFramework/featureFiles/Login.feature:4 # Scenario: Login into account with correct credentials
1 Scenarios (1 failed)
6 Steps (1 failed, 5 skipped)
0m0,357s

java.lang.ExceptionInInitializerError
    at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters(XStream.java:820)
    at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:574)
    at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:530)
    at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.(LocalizedXStreams.java:50)
    at cucumber.runtime.xstream.LocalizedXStreams.newXStream(LocalizedXStreams.java:37)
    at cucumber.runtime.xstream.LocalizedXStreams.get(LocalizedXStreams.java:29)
    at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:37)
    at cucumber.runtime.Runtime.runStep(Runtime.java:300)
    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:44)
    at cucumber.runtime.model.CucumberFeature.run(CucumberFeature.java:165)
    at cucumber.runtime.Runtime.run(Runtime.java:122)
    at cucumber.api.cli.Main.run(Main.java:36)
    at cucumber.api.cli.Main.main(Main.java:18)
    at ✽.Given User navigates to stackoverflow website(C:/Users/MI/Desktop/CucumberFramework/CucumberFramework/src/test/java/CucumberFramework/featureFiles/Login.feature:5)

Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: module java.base does not "opens java.util" to unnamed module @5afa04c
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
    at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:177)
    at java.base/java.lang.reflect.Field.setAccessible(Field.java:171)
    at cucumber.deps.com.thoughtworks.xstream.core.util.Fields.locate(Fields.java:39)
    at cucumber.deps.com.thoughtworks.xstream.converters.collections.TreeMapConverter.(TreeMapConverter.java:50)
    at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters(XStream.java:820)
    at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:574)
    at cucumber.deps.com.thoughtworks.xstream.XStream.(XStream.java:530)
    at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.(LocalizedXStreams.java:50)
    at cucumber.runtime.xstream.LocalizedXStreams.newXStream(LocalizedXStreams.java:37)
    at cucumber.runtime.xstream.LocalizedXStreams.get(LocalizedXStreams.java:29)
    at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:37)
    at cucumber.runtime.Runtime.runStep(Runtime.java:300)
    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:44)
    at cucumber.runtime.model.CucumberFeature.run(CucumberFeature.java:165)
    at cucumber.runtime.Runtime.run(Runtime.java:122)
    at cucumber.api.cli.Main.run(Main.java:36)
    at cucumber.api.cli.Main.main(Main.java:18)*

user_1961655 · Answer

I did not have an Cucumber feature installed so the problem in my setup was not related to it. what did help me is updating the maven plugin settings in my pom file as below.


org.apache.maven.plugins
maven-war-plugin
3.3.1


  org.apache.maven.plugins
  maven-compiler-plugin
  3.8.1

user_3945473 · Answer

Your version of Cucumber is not compatible with your version of Java. Either upgrade Cucumber or downgrade Java.

Because of the Scenario you are testing I am guessing you are following an old tutorial. This one is up to date:

https://cucumber.io/docs/guides/10-minute-tutorial/

user_11828632 · Answer

Change the maven dependencies. My application uses the info-cukes for cucumber in pom.xml. I changed them with io-cucumber. it works for me.

user_17211811 · Answer

I've face the same issue but resolved the issue with following code.

******** Feature file **************

Feature: Application login
Scenario: Login into Application
Given user click on login page
When user enter username password
Then user can see home page

*********** StepDefination file************

package StepDefinations;
import org.junit.runner.RunWith;
@RunWith(io.cucumber.junit.Cucumber.class)
public class StepDefination {
@io.cucumber.java.en.Given("^user click on login page$")
public void user_click_on_login_page() throws Throwable {
// Write code here that turns the phrase above into concrete actions
System.out.println("test 1");
}


@io.cucumber.java.en.When("^user enter username password$")
public void user_enter_username_password() throws Throwable {
// Write code here that turns the phrase above into concrete actions
System.out.println("test 2");
}


@io.cucumber.java.en.Then("^user can see home page$")
public void user_can_see_home_page() throws Throwable {
// Write code here that turns the phrase above into concrete actions
System.out.println("test 3");
}}

********* TestRunner file **************

package cucumber.Options;
import org.junit.runner.RunWith;
@RunWith(io.cucumber.junit.Cucumber.class)
@io.cucumber.junit.CucumberOptions(features="src/test/java/features",` `glue={"StepDefinations"})

public class TestRunner {}

Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: java.base doesn't "opens java.util" to unnamed module

4 Answers

I've face the same issue but resolved the issue with following code.