Add "What's New?" document to the ref guide (#579)

spring-pulsar-docs/src/main/antora/modules/ROOT/nav.adoc

@@ -1,9 +1,10 @@
 * xref:index.adoc[Overview]
-* xref:intro.adoc[Introduction]
-** xref:intro/project-state.adoc[Project Status]
-** xref:intro/system-requirements.adoc[System Requirements]
-** xref:intro/building.adoc[Building the Project]
-** xref:intro/getting-help.adoc[Getting Help]
+* xref:whats-new.adoc[]
+* xref:intro.adoc[]
+** xref:intro/project-state.adoc[]
+** xref:intro/system-requirements.adoc[]
+** xref:intro/building.adoc[]
+** xref:intro/getting-help.adoc[]
 * xref:reference/reference.adoc[]
 ** xref:reference/pulsar.adoc[]
 *** xref:reference/tombstones.adoc[]

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/intro/building.adoc

@@ -1,5 +1,5 @@
 [[building-project]]
-== Building the Project
+= Building the Project
 
 include::../attributes/attributes-variables.adoc[]
 

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/reference/pulsar.adoc

@@ -296,6 +296,7 @@ void listen(String message) {
 
 TIP: The properties used are direct Pulsar consumer properties, not the `spring.pulsar.consumer` application configuration properties
 
+[[listener-auto-consume]]
 ==== Generic records with AUTO_CONSUME
 If there is no chance to know the type of schema of a Pulsar topic in advance, you can use the `AUTO_CONSUME` schema type to consume generic records.
 In this case, the topic deserializes messages into `GenericRecord` objects using the schema info associated with the topic.

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/reference/schema-info/custom-schema-mapping-annotation.adoc

@@ -0,0 +1,13 @@
+== Type mapping annotation
+
+Another option for specifying default schema information to use for a particular message type is to mark the message class with the `@PulsarMessage` annotation.
+The schema info can be specified via the `schemaType` attribute on the annotation.
+
+The following example configures the system to use JSON as the default schema when producing or consuming messages of type `Foo`:
+
+[source,java,indent=0,subs="verbatim"]
+----
+@PulsarMessage(schemaType = SchemaType.JSON)
+record Foo(String value) {
+}
+----

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/reference/schema-info/custom-schema-mapping.adoc

@@ -34,16 +34,3 @@ public SchemaResolverCustomizer<DefaultSchemaResolver> schemaResolverCustomizer(
 	}
 }
 ----
-
-==== Type mapping annotation
-Another option for specifying default schema information to use for a particular message type is to mark the message class with the `@PulsarMessage` annotation.
-The schema info can be specified via the `schemaType` attribute on the annotation.
-
-The following example configures the system to use JSON as the default schema when producing or consuming messages of type `Foo`:
-
-[source,java,indent=0,subs="verbatim"]
-----
-@PulsarMessage(schemaType = SchemaType.JSON)
-record Foo(String value) {
-}
-----

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/reference/schema-info/schema-info-listener.adoc

@@ -10,6 +10,9 @@ This removes the need to set the schema on the listener as the framework consult
 
 include::custom-schema-mapping.adoc[]
 
+[[listener-default-schema-annotation]]
+include::custom-schema-mapping-annotation.adoc[leveloffset=+2]
+
 With this configuration in place, there is no need to set the schema on the listener, for example:
 
 include::{listener-class}/listener-snippet.adoc[]

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/reference/schema-info/schema-info-template.adoc

@@ -13,8 +13,12 @@ This removes the need to specify the schema as the framework consults the resolv
 
 include::custom-schema-mapping.adoc[]
 
+[[template-default-schema-annotation]]
+include::custom-schema-mapping-annotation.adoc[leveloffset=+2]
+
 With this configuration in place, there is no need to set specify the schema on send operations.
 
+[[template-auto-produce]]
 === Producing with AUTO_SCHEMA
 If there is no chance to know the type of schema of a Pulsar topic in advance, you can use an {apache-pulsar-docs}/schema-get-started/#auto_produce[AUTO_PRODUCE] schema to publish a raw JSON or Avro payload as a `byte[]` safely.
 

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/reference/topic-resolution.adoc

@@ -34,6 +34,7 @@ NOTE: The `message-type` is the fully-qualified name of the message class.
 
 WARNING: If the message (or the first message of a `Publisher` input) is `null`, the framework won't be able to determine the topic from it. Another method shall be used to specify the topic if your application is likely to send `null` messages.
 
+[[default-topic-via-annotation]]
 === Specified via annotation
 
 When no topic is passed into the API and there are no custom topic mappings configured, the system looks for a `@PulsarMessage` annotation on the class of the message being produced or consumed.

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/whats-new.adoc

@@ -0,0 +1,23 @@
+= What's new?
+
+[[what-s-new-in-1-1-since-1-0]]
+== What's New in 1.1 Since 1.0
+:page-section-summary-toc: 1
+
+This section covers the changes made from version 1.0 to version 1.1.
+
+=== Auto Schema support
+If there is no chance to know the schema of a Pulsar topic in advance, you can use AUTO Schemas to produce/consume generic records to/from brokers.
+See xref:./reference/pulsar.adoc#template-auto-produce[Producing with AUTO_SCHEMA] and xref:./reference/pulsar.adoc#listener-auto-consume[Consuming with AUTO_SCHEMA] for more details.
+
+NOTE: While the above links focus on `PulsarTemplate` and `@PulsarListener`, this feature is also supported in `ReactivePulsarTemplate`, `@ReactivePulsarListener`, and `@PulsarReader`.
+Details for each can be found in their respective section of this reference guide.
+
+=== Default topic/schema via message annotation
+You can now mark a message class with `@PulsarMessage` to specify the xref:./reference/pulsar.adoc#default-topic-via-annotation[default topic] and/or xref:./reference/pulsar.adoc#listener-default-schema-annotation[default schema] to use when producing/consuming messages of that type.
+
+=== Remove checked exceptions
+The APIs provided by the framework no longer throw the checked `PulsarClientException`, but rather the unchecked `PulsarException`.
+
+WARNING: If you were previously catching or rethrowing `PulsarClientException` just to appease the compiler and were not actually handling the exception, you can simply remove your `catch` or `throws` clause.
+If you were actually handling the exception then you will need to replace `PulsarClientException` with `PulsarException` in your catch clause.