javadoc improvements

Author: cowtowncoder

avro/src/main/java/com/fasterxml/jackson/dataformat/avro/AvroTypeDeserializer.java

@@ -13,7 +13,12 @@
 import com.fasterxml.jackson.databind.jsontype.impl.TypeDeserializerBase;
 import com.fasterxml.jackson.dataformat.avro.schema.AvroSchemaHelper;
 
-public class AvroTypeDeserializer extends TypeDeserializerBase {
+/**
+ * @since 2.9
+ */
+public class AvroTypeDeserializer extends TypeDeserializerBase
+{
+    private static final long serialVersionUID = 1L;
 
     protected AvroTypeDeserializer(JavaType baseType, TypeIdResolver idRes, String typePropertyName, boolean typeIdVisible,
                                    JavaType defaultImpl) {

avro/src/main/java/com/fasterxml/jackson/dataformat/avro/AvroTypeIdResolver.java

@@ -15,9 +15,11 @@
 /**
  * {@link com.fasterxml.jackson.databind.jsontype.TypeIdResolver} for Avro type IDs embedded in schemas. Avro generally uses class names,
  * but we want to also support named subtypes so that developers can easily remap the embedded type IDs to a different runtime class.
+ *
+ * @since 2.9
  */
-public class AvroTypeIdResolver extends ClassNameIdResolver {
-
+public class AvroTypeIdResolver extends ClassNameIdResolver
+{
     private final Map<String, Class<?>> _idTypes = new HashMap<>();
 
     private final Map<Class<?>, String> _typeIds = new HashMap<>();

avro/src/main/java/com/fasterxml/jackson/dataformat/avro/AvroTypeResolverBuilder.java

@@ -12,7 +12,9 @@
 import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
 import com.fasterxml.jackson.databind.jsontype.impl.StdTypeResolverBuilder;
 
-
+/**
+ * @since 2.9
+ */
 public class AvroTypeResolverBuilder extends StdTypeResolverBuilder {
 
     public AvroTypeResolverBuilder() {

avro/src/main/java/com/fasterxml/jackson/dataformat/avro/AvroUntypedDeserializer.java

@@ -17,8 +17,14 @@
  * for native type information when handling scalar values, but Avro sometimes includes type information in the schema for scalar values;
  * This subclass checks for the presence of valid type information and calls out to the type deserializer even for scalar values. The
  * same goes for map keys.
+ *
+ * @since 2.9
  */
-public class AvroUntypedDeserializer extends UntypedObjectDeserializer {
+public class AvroUntypedDeserializer extends UntypedObjectDeserializer
+{
+    private static final long serialVersionUID = 1L;
+
+    public AvroUntypedDeserializer() { super(); }
 
     @Override
     public Object deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {