Implicitly defined serializers fixed

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

@@ -334,7 +334,7 @@ DeserializerBinding introspectDeserializerBinding(Class<? extends JsonbDeseriali
     SerializerBinding introspectSerializerBinding(Class<? extends JsonbSerializer> serializerClass, JsonbSerializer instance) {
         final ParameterizedType serializerRuntimeType = ReflectionUtils
                 .findParameterizedType(serializerClass, JsonbSerializer.class);
-        Type serBindingType = resolveTypeArg(serializerRuntimeType.getActualTypeArguments()[0], serializerClass.getClass());
+        Type serBindingType = resolveTypeArg(serializerRuntimeType.getActualTypeArguments()[0], serializerClass);
         final ComponentBindings componentBindings = getBindingInfo(serBindingType);
         if (componentBindings.getSerializer() != null && componentBindings.getSerializer().getClass().equals(serializerClass)) {
             return componentBindings.getSerializer();

src/test/java/org/eclipse/yasson/serializers/SerializersTest.java

@@ -51,7 +51,9 @@
 import org.eclipse.yasson.serializers.model.CrateJsonObjectDeserializer;
 import org.eclipse.yasson.serializers.model.CrateSerializer;
 import org.eclipse.yasson.serializers.model.CrateSerializerWithConversion;
+import org.eclipse.yasson.serializers.model.ExplicitJsonbSerializer;
 import org.eclipse.yasson.serializers.model.GenericPropertyPojo;
+import org.eclipse.yasson.serializers.model.ImplicitJsonbSerializer;
 import org.eclipse.yasson.serializers.model.NumberDeserializer;
 import org.eclipse.yasson.serializers.model.NumberSerializer;
 import org.eclipse.yasson.serializers.model.RecursiveDeserializer;
@@ -710,5 +712,17 @@ public Type getOwnerType() {
         assertTrue(genericBeanDeserializer.called);
 
     }
+
+    @Test
+    public void testImplicitJsonbSerializers() {
+        Jsonb jsonb = JsonbBuilder.create(new JsonbConfig().withSerializers(new ExplicitJsonbSerializer()));
+        String expected = "{\"value\":\"123\"}";
+        Box box = new Box();
+        box.boxStr = "Box";
+        assertEquals(expected, jsonb.toJson(box));
+
+        jsonb = JsonbBuilder.create(new JsonbConfig().withSerializers(new ImplicitJsonbSerializer()));
+        assertEquals(expected, jsonb.toJson(box));
+    }
 
 }

src/test/java/org/eclipse/yasson/serializers/model/AbstractJsonbSerializer.java

@@ -0,0 +1,30 @@
+/*
+ * 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.serializers.model;
+
+import jakarta.json.Json;
+import jakarta.json.JsonStructure;
+import jakarta.json.bind.serializer.JsonbSerializer;
+import jakarta.json.bind.serializer.SerializationContext;
+import jakarta.json.stream.JsonGenerator;
+
+/**
+ * Abstract serializer.
+ */
+public class AbstractJsonbSerializer<T> implements JsonbSerializer<T> {
+    @Override
+    public void serialize(T obj, JsonGenerator generator, SerializationContext ctx) {
+        JsonStructure json = Json.createObjectBuilder().add("value", "123").build();
+        generator.write(json);
+    }
+}

src/test/java/org/eclipse/yasson/serializers/model/ExplicitJsonbSerializer.java

@@ -0,0 +1,21 @@
+/*
+ * 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.serializers.model;
+
+import jakarta.json.bind.serializer.JsonbSerializer;
+
+/**
+ * Explicit serializer.
+ */
+public class ExplicitJsonbSerializer extends AbstractJsonbSerializer<Box> implements JsonbSerializer<Box> {
+}

src/test/java/org/eclipse/yasson/serializers/model/ImplicitJsonbSerializer.java

@@ -0,0 +1,19 @@
+/*
+ * 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.serializers.model;
+
+/**
+ * Implicit serializer.
+ */
+public class ImplicitJsonbSerializer extends AbstractJsonbSerializer<Box> {
+}