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.<init>(XStream.java:574)
        at cucumber.deps.com.thoughtworks.xstream.XStream.<init>(XStream.java:530)
        at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.<init>(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.<clinit>(TreeMapConverter.java:50)
        at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters(XStream.java:820)
        at cucumber.deps.com.thoughtworks.xstream.XStream.<init>(XStream.java:574)
        at cucumber.deps.com.thoughtworks.xstream.XStream.<init>(XStream.java:530)
        at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.<init>(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.<init>(XStream.java:574)
    at cucumber.deps.com.thoughtworks.xstream.XStream.<init>(XStream.java:530)
    at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.<init>(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.<clinit>(TreeMapConverter.java:50)
    at cucumber.deps.com.thoughtworks.xstream.XStream.setupConverters(XStream.java:820)
    at cucumber.deps.com.thoughtworks.xstream.XStream.<init>(XStream.java:574)
    at cucumber.deps.com.thoughtworks.xstream.XStream.<init>(XStream.java:530)
    at cucumber.runtime.xstream.LocalizedXStreams$LocalizedXStream.<init>(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)*

I imagine the following leads to the solution, although I imagine it might be a little difficult for you to understand: https://stackoverflow.com/questions/41265266/how-to-solve-inaccessibleobjectexception-unable-to-make-member-accessible-m/41265267#41265267 . — David M. Karr, Aug 29 '21 at 19:03

score 3 · Answer 1 · answered Aug 29 '21 at 20:15

3

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/

answered Aug 29 '21 at 20:15

M.P. Korstanje

8,279
3
33
49

Hi, I am getting the same error. How do you know that this is the cause? What part of that error message tells you that this is the case? I am trying to create a selenium cucumber project in Eclipse and my java version is 17./ How would I know what versions of cucumber, junit etc to use? Thanks. – chucknor Jan 25 '22 at 14:21
Bit hard to explain if you haven't followed the Java lifecycle closely. The tutorial I linked in the answer uses a recent version that works with Java 17. – M.P. Korstanje Jan 25 '22 at 15:52

score 0 · Answer 2 · answered Jan 25 '22 at 17:50

0

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.

answered Jan 25 '22 at 17:50

Müge Sasmaz

1

Suhas Awale · Answer 3 · 2021-10-21T15:34:07.583

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

3 Answers3

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

Linked