Emit StepMatchArgumentsList for ambiguous steps

CHANGELOG.md

@@ -10,6 +10,18 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- [Core] Emit StepMatchArgumentsList for ambiguous steps ([#3066](https://github.com/cucumber/cucumber-jvm/pull/3066) M.P. Korstanje)
+
+### Changed
+- [Core] Update dependency io.cucumber:cucumber-json-formatter to v0.2.0
+- [Core] Update dependency io.cucumber:gherkin to v35.0.0
+- [Core] Update dependency io.cucumber:html-formatter to v21.15.0
+- [Core] Update dependency io.cucumber:junit-xml-formatter to v0.9.0
+- [Core] Update dependency io.cucumber:messages to v29.0.1 
+- [Core] Update dependency io.cucumber:pretty-formatter to v2.2.0
+- [Core] Update dependency io.cucumber:query to v14.0.1
+- [Core] Update dependency io.cucumber:testng-xml-formatter to v0.6.0
 
 ## [7.28.2] - 2025-09-09
 ### Fixed

cucumber-bom/pom.xml

@@ -15,15 +15,15 @@
     <properties>
         <ci-environment.version>10.0.1</ci-environment.version>
         <cucumber-expressions.version>18.0.1</cucumber-expressions.version>
-        <cucumber-json-formatter.version>0.1.3</cucumber-json-formatter.version>
-        <gherkin.version>34.0.0</gherkin.version>
-        <html-formatter.version>21.13.0</html-formatter.version>
-        <junit-xml-formatter.version>0.8.1</junit-xml-formatter.version>
+        <cucumber-json-formatter.version>0.2.0</cucumber-json-formatter.version>
+        <gherkin.version>35.0.0</gherkin.version>
+        <html-formatter.version>21.15.1</html-formatter.version>
+        <junit-xml-formatter.version>0.9.0</junit-xml-formatter.version>
         <messages.version>29.0.1</messages.version>
-        <pretty-formatter.version>2.1.0</pretty-formatter.version>
-        <query.version>13.6.0</query.version>
+        <pretty-formatter.version>2.2.0</pretty-formatter.version>
+        <query.version>14.0.1</query.version>
         <tag-expressions.version>6.1.2</tag-expressions.version>
-        <testng-xml-formatter.version>0.5.0</testng-xml-formatter.version>
+        <testng-xml-formatter.version>0.6.0</testng-xml-formatter.version>
     </properties>
 
     <dependencyManagement>

cucumber-core/src/main/java/io/cucumber/core/runner/AmbiguousPickleStepDefinitionsMatch.java

@@ -2,9 +2,12 @@
 
 import io.cucumber.core.backend.TestCaseState;
 import io.cucumber.core.gherkin.Step;
+import io.cucumber.plugin.event.Argument;
 
 import java.net.URI;
 import java.util.Collections;
+import java.util.List;
+import java.util.stream.Collectors;
 
 final class AmbiguousPickleStepDefinitionsMatch extends PickleStepDefinitionMatch {
 
@@ -25,4 +28,10 @@ public void dryRunStep(TestCaseState state) throws AmbiguousStepDefinitionsExcep
         throw exception;
     }
 
+    List<List<Argument>> getDefinitionArguments() {
+        return exception.getMatches().stream()
+                .map(Match::getArguments)
+                .map(DefinitionArgument::createArguments)
+                .collect(Collectors.toList());
+    }
 }

cucumber-core/src/main/java/io/cucumber/core/runner/CachingGlue.java

@@ -454,6 +454,7 @@ private PickleStepDefinitionMatch findStepDefinitionMatch(URI uri, Step step)
             return null;
         }
         if (matches.size() > 1) {
+            // TODO: Don't use exceptions for control flow
             throw new AmbiguousStepDefinitionsException(step, matches);
         }
 

cucumber-core/src/main/java/io/cucumber/core/runner/TestCase.java

@@ -6,6 +6,7 @@
 import io.cucumber.messages.types.Envelope;
 import io.cucumber.messages.types.StepMatchArgument;
 import io.cucumber.messages.types.StepMatchArgumentsList;
+import io.cucumber.plugin.event.Argument;
 import io.cucumber.plugin.event.Group;
 import io.cucumber.plugin.event.Location;
 import io.cucumber.plugin.event.Result;
@@ -199,14 +200,25 @@ private io.cucumber.messages.types.TestStep createTestStep(TestStep pluginTestSt
     }
 
     public List<StepMatchArgumentsList> getStepMatchArguments(PickleStepTestStep pickleStep) {
-        if (pickleStep.getDefinitionMatch() instanceof UndefinedPickleStepDefinitionMatch) {
+        PickleStepDefinitionMatch definitionMatch = pickleStep.getDefinitionMatch();
+        if (definitionMatch instanceof UndefinedPickleStepDefinitionMatch) {
             return emptyList();
         }
 
-        return singletonList(pickleStep.getDefinitionArgument()
-                .stream()
+        if (definitionMatch instanceof AmbiguousPickleStepDefinitionsMatch) {
+            AmbiguousPickleStepDefinitionsMatch ambiguousPickleStepDefinitionsMatch = (AmbiguousPickleStepDefinitionsMatch) definitionMatch;
+            return ambiguousPickleStepDefinitionsMatch.getDefinitionArguments().stream()
+                    .map(TestCase::createStepMatchArgumentList)
+                    .collect(toList());
+        }
+
+        return singletonList(createStepMatchArgumentList(pickleStep.getDefinitionArgument()));
+    }
+
+    private static StepMatchArgumentsList createStepMatchArgumentList(List<Argument> arguments) {
+        return arguments.stream()
                 .map(arg -> new StepMatchArgument(makeMessageGroup(arg.getGroup()), arg.getParameterTypeName()))
-                .collect(Collectors.collectingAndThen(toList(), StepMatchArgumentsList::new)));
+                .collect(Collectors.collectingAndThen(toList(), StepMatchArgumentsList::new));
     }
 
     private void emitTestCaseStarted(EventBus bus, Instant start, UUID executionId) {