Fail with multiple levels of generics

src/main/java/org/eclipse/yasson/internal/VariableTypeInheritanceSearch.java

@@ -96,7 +96,7 @@ private Type checkSubclassRuntimeInfo(TypeVariable typeVar) {
 
     private Type searchRuntimeTypeArgument(ParameterizedType runtimeType, TypeVariable<?> typeVar) {
         if (ReflectionUtils.getRawType(runtimeType) != typeVar.getGenericDeclaration()) {
-            return ReflectionUtils.getOptionalRawType(typeVar).filter(rawType -> !Object.class.equals(rawType)).orElse(null);
+            return null;
         }
         TypeVariable[] bounds = typeVar.getGenericDeclaration().getTypeParameters();
         for (int i = 0; i < bounds.length; i++) {

src/test/java/org/eclipse/yasson/defaultmapping/generics/GenericsTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2020 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2021 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
@@ -12,6 +12,8 @@
 
 package org.eclipse.yasson.defaultmapping.generics;
 
+import org.eclipse.yasson.defaultmapping.generics.model.FinalMember;
+import org.eclipse.yasson.defaultmapping.generics.model.FinalGenericWrapper;
 import org.junit.jupiter.api.*;
 import static org.junit.jupiter.api.Assertions.*;
 import static org.eclipse.yasson.Jsonbs.*;
@@ -428,6 +430,20 @@ public void collectionWrapperTest() {
         String s = defaultJsonb.toJson(collectionWrapper);
     }
 
+    @Test
+    public void multipleGenericLevels() {
+        FinalMember member = new FinalMember();
+        member.setName("Jason");
+        FinalGenericWrapper concreteContainer = new FinalGenericWrapper();
+        concreteContainer.setMember(member);
+
+        String expected = "{\"member\":{\"name\":\"Jason\"}}";
+        Jsonb jsonb = JsonbBuilder.create();
+        assertEquals(expected, jsonb.toJson(concreteContainer));
+        FinalGenericWrapper finalGenericWrapper = jsonb.fromJson(expected, FinalGenericWrapper.class);
+        assertEquals(concreteContainer, finalGenericWrapper);
+    }
+
     public interface FunctionalInterface<T> {
         T getValue();
     }

src/test/java/org/eclipse/yasson/defaultmapping/generics/model/AbstractGenericWrapper.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+package org.eclipse.yasson.defaultmapping.generics.model;
+
+import java.util.Objects;
+
+public abstract class AbstractGenericWrapper<T extends AbstractMember> {
+
+    T member;
+
+    public T getMember() {
+        return member;
+    }
+
+    public void setMember(T member) {
+        this.member = member;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        AbstractGenericWrapper<?> that = (AbstractGenericWrapper<?>) o;
+        return Objects.equals(member, that.member);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(member);
+    }
+}

src/test/java/org/eclipse/yasson/defaultmapping/generics/model/AbstractMember.java

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+package org.eclipse.yasson.defaultmapping.generics.model;
+
+public class AbstractMember {
+}

src/test/java/org/eclipse/yasson/defaultmapping/generics/model/FinalGenericWrapper.java

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+package org.eclipse.yasson.defaultmapping.generics.model;
+
+public class FinalGenericWrapper extends MiddleGenericWrapper<FinalMember> {
+
+}

src/test/java/org/eclipse/yasson/defaultmapping/generics/model/FinalMember.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+package org.eclipse.yasson.defaultmapping.generics.model;
+
+import java.util.Objects;
+
+public class FinalMember extends AbstractMember {
+    String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        FinalMember that = (FinalMember) o;
+        return Objects.equals(name, that.name);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name);
+    }
+}

src/test/java/org/eclipse/yasson/defaultmapping/generics/model/MiddleGenericWrapper.java

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2021 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0,
+ * or the Eclipse Distribution License v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+
+package org.eclipse.yasson.defaultmapping.generics.model;
+
+public abstract class MiddleGenericWrapper<T extends AbstractMember> extends AbstractGenericWrapper<T> {
+
+}