ST6RI-951 NullPointerException in FeatureAdapter#getTypes when a feature chain is partially unresolved

org.omg.sysml.logic/src/main/java/org/omg/sysml/adapter/FeatureAdapter.java

@@ -2,7 +2,7 @@
  * SysML 2 Pilot Implementation
  * Copyright (c) 2021-2026 Model Driven Solutions, Inc.
  * Copyright (c) 2026 Obeo
- *    
+ *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the Eclipse Public License as published by
  * the Eclipse Foundation, version 2 of the License.
@@ -543,7 +543,7 @@ public void getTypes(List<Type> types, Set<Feature> visitedFeatures) {
 		computeImplicitGeneralTypes();
 		getFeatureTypes(types, visitedFeatures);
 		for (Feature typingFeature : feature.typingFeatures()) {
-			if (!visitedFeatures.contains(typingFeature)) {
+			if (typingFeature != null && !visitedFeatures.contains(typingFeature)) {
 				FeatureUtil.getTypesOf(typingFeature, types, visitedFeatures);
 			}
 		}

org.omg.sysml.logic/src/test/java/org/omg/sysml/logic/FeatureAdapterTest.java

@@ -0,0 +1,54 @@
+/*******************************************************************************
+ * SysML 2 Pilot Implementation
+ * Copyright (c) 2026 Obeo
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the Eclipse Public License as published by
+ * the Eclipse Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * Eclipse Public License for more details.
+ *
+ * You should have received a copy of theEclipse Public License
+ * along with this program. If not, see <https://www.eclipse.org/legal/epl-2.0/>.
+ *
+ * @license EPL-2.0 <http://spdx.org/licenses/EPL-2.0>
+ *
+ *******************************************************************************/
+
+package org.omg.sysml.logic;
+
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+import org.omg.sysml.lang.sysml.Feature;
+import org.omg.sysml.lang.sysml.FeatureChaining;
+import org.omg.sysml.lang.sysml.SysMLFactory;
+import org.omg.sysml.lang.sysml.SysMLPackage;
+
+/**
+ * Tests feature derived-property computations implemented by the logic adapters.
+ */
+public class FeatureAdapterTest {
+
+	/**
+	 * A partially linked feature chain can contribute a null entry to
+	 * typingFeatures(). Type derivation must ignore that unresolved chaining
+	 * target instead of recursing into it.
+	 */
+	@Test
+	public void typeDerivationIgnoresUnresolvedChainingFeature() {
+		SysMLLogicStandaloneSetup.doSetup();
+		SysMLPackage.eINSTANCE.eClass();
+
+		Feature feature = SysMLFactory.eINSTANCE.createFeature();
+		FeatureChaining unresolvedChaining = SysMLFactory.eINSTANCE.createFeatureChaining();
+		feature.getOwnedRelationship().add(unresolvedChaining);
+
+		assertNull(feature.typingFeatures().get(0));
+		assertTrue(feature.getType().isEmpty());
+	}
+}