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[Kotlin Java8] Support closures
The implementation of t he `ConstantPoolTypeIntrospector` did not fully support closures. Using a closure without scoped variables would result in a null pointer exception. E.g: ```java Given("^A statement with a body expression$") { assertTrue(true) } ``` This is resolved check if the member reference method equals the magic constant "INSTANCE" and return no type arguments. Related issues: - #1123 - #1126 This fixes #1123
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‎History.md

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## [2.0.0-SNAPSHOT](https://github.com/cucumber/cucumber-jvm/compare/v1.2.5...master) (In Git)
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* [Java8, Kotlin Java8] Support java 8 method references ([#1140](https://github.com/cucumber/cucumber-jvm/pull/1140) M.P. Korstanje)
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* [Core] Show explicit error message when field name missed in table header ([#1014](https://github.com/cucumber/cucumber-jvm/pull/1014) Mykola Gurov)
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* [Examples] Properly quit selenium in webbit examples ([#1146](https://github.com/cucumber/cucumber-jvm/pull/1146) Alberto Scotto)
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* [JUnit] Use AssumptionFailed to mark scenarios/steps as skipped ([#1142](https://github.com/cucumber/cucumber-jvm/pull/1142) Björn Rasmusson)

‎java8/src/main/java/cucumber/runtime/java8/ConstantPoolTypeIntrospector.java

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@@ -35,6 +35,11 @@ public Type[] getGenericTypes(Class<? extends StepdefBody> clazz, Class<? extend
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final String[] member = getMemberReference(constantPool);
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final int parameterCount = interfac3.getTypeParameters().length;
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// Kotlin lambda expression without arguments or closure variables
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if (member[REFERENCE_METHOD].equals("INSTANCE")) {
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return handleKotlinInstance();
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}
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final jdk.internal.org.objectweb.asm.Type[] argumentTypes = jdk.internal.org.objectweb.asm.Type.getArgumentTypes(member[REFERENCE_ARGUMENT_TYPES]);
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// If we are one parameter short, this is a
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return typeArguments;
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}
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private static Type[] handleKotlinInstance() {
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return new Type[0];
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}
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private static String[] getMemberReference(ConstantPool constantPool) {
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int size = constantPool.getSize();
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‎kotlin-java8/README.md

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Java 8 Bindings for Kotlin
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==========================
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This module only runs tests.
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You can use `cucumber-java` or `cucumber-java8` directly in Kotlin.

‎kotlin-java8/pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-jvm</artifactId>
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<relativePath>../pom.xml</relativePath>
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<version>2.0.0-SNAPSHOT</version>
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</parent>
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<artifactId>cucumber-kotlin-java8</artifactId>
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<packaging>jar</packaging>
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<name>Cucumber-JVM: Kotlin Java8</name>
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<properties>
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<kotlin.version>1.1.2-2</kotlin.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-java8</artifactId>
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</dependency>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-junit</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>net.sourceforge.cobertura</groupId>
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<artifactId>cobertura</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib</artifactId>
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<version>${kotlin.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
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<testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
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<plugins>
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<plugin>
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<artifactId>kotlin-maven-plugin</artifactId>
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<groupId>org.jetbrains.kotlin</groupId>
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<version>${kotlin.version}</version>
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<executions>
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<execution>
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<id>compile</id>
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<goals>
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<goal>compile</goal>
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</goals>
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</execution>
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<execution>
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<id>test-compile</id>
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<goals>
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<goal>test-compile</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<configuration>
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<skip>true</skip>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<configuration>
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<skip>true</skip>
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</configuration>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<configuration>
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<skip>true</skip>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎kotlin-java8/src/test/kotlin/cucumber/runtime/kotlin/test/LambdaStepdefs.kt

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package cucumber.runtime.kotlin.test;
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import cucumber.api.DataTable
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import cucumber.api.Scenario
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import cucumber.api.java8.En
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import org.junit.Assert.*
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var lastInstance : LambdaStepdefs? = null
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class LambdaStepdefs : En {
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init {
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Before { scenario: Scenario ->
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assertNotSame(this, lastInstance)
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lastInstance = this
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}
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Given("^this data table:$") { peopleTable: DataTable ->
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val people = peopleTable.asList(Person::class.java)
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assertEquals("Aslak", people[0].first)
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assertEquals("Hellesøy", people[0].last)
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}
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val alreadyHadThisManyCukes = 1
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Given("^I have (\\d+) cukes in my belly$") { n: Long ->
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assertEquals(1, alreadyHadThisManyCukes)
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assertEquals(42L, n)
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}
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val localState = "hello"
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Then("^I really have (\\d+) cukes in my belly") { i: Int ->
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assertEquals(42, i)
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assertEquals("hello", localState)
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}
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Given("^A statement with a body expression$") { assertTrue(true) }
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Given("^A statement with a simple match$", { -> assertTrue(true) })
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val localInt = 1
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Given("^A statement with a scoped argument$", { assertEquals(2, localInt + 1) })
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Given("^I will give you (\\d+) and ([\\d\\.]+) and (\\w+) and (\\d+)$") { a: Int, b: Float, c: String, d: Int ->
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assertEquals(1, a)
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assertEquals(2.2f, b)
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assertEquals("three", c)
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assertEquals(4, d)
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}
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}
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class Person {
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internal var first: String? = null
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internal var last: String? = null
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}
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}

‎kotlin-java8/src/test/kotlin/cucumber/runtime/kotlin/test/RunCukesTest.kt

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package cucumber.runtime.kotlin.test
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import cucumber.api.junit.Cucumber
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import org.junit.runner.RunWith
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@RunWith(Cucumber::class)
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class RunCukesTest {
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}

‎kotlin-java8/src/test/resources/cucumber/runtime/kotlin/test/kotlin.feature

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Feature: Kotlin
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Scenario: use the API with Java8 style
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Given I have 42 cukes in my belly
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Then I really have 42 cukes in my belly
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Scenario: another scenario which should have isolated state
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Given I have 42 cukes in my belly
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And something that isn't defined
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Scenario: Parameterless lambdas
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Given A statement with a simple match
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Given A statement with a scoped argument
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Scenario: I can use body expressions
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Given A statement with a body expression
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Scenario: Multi-param lambdas
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Given I will give you 1 and 2.2 and three and 4
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Scenario: use a table
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Given this data table:
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| first | last |
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| Aslak | Hellesøy |
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| Donald | Duck |

‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<modelVersion>4.0.0</modelVersion>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-jvm</artifactId>
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<version>2.0.0-SNAPSHOT</version>
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<artifactId>android-examples</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-java8</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>io.cucumber</groupId>
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<artifactId>cucumber-kotlin-java8</artifactId>
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<version>${project.version}</version>
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</dependency>
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<!-- Spring stuff -->
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<dependency>
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</activation>
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<modules>
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<module>java8</module>
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<module>kotlin-java8</module>
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</modules>
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</profile>
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