Add BOM (spring-pulsar-bom) module (#535)

README.adoc

@@ -79,6 +79,9 @@ There are several modules in Spring for Apache Pulsar. Here is a quick overview:
 === spring-pulsar
 The main library that provides the API to access Apache Pulsar.
 
+=== spring-pulsar-bom
+Provides a Maven BOM (https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#bill-of-materials-bom-poms[Bill of Materials]) that recommends a consistent version for all Spring for Apache Pulsar published modules.
+
 === spring-pulsar-cache-provider
 Provides the interfaces for the cache provider used by the main library to cache producers.
 

settings.gradle

@@ -13,6 +13,7 @@ plugins {
 }
 
 include 'spring-pulsar'
+include 'spring-pulsar-bom'
 include 'spring-pulsar-cache-provider'
 include 'spring-pulsar-cache-provider-caffeine'
 include 'spring-pulsar-reactive'

spring-pulsar-bom/spring-pulsar-bom.gradle

@@ -0,0 +1,20 @@
+import org.springframework.pulsar.gradle.SpringModulePlugin
+
+plugins {
+	id 'org.springframework.pulsar.spring-module'
+}
+
+description = 'Spring Pulsar (Bill of Materials)'
+
+dependencies {
+	constraints {
+		project.rootProject.subprojects
+				.sort { "$it.name" }
+				.findAll { it.name != "spring-pulsar-bom" }
+				.each { p ->
+					p.plugins.withType(SpringModulePlugin) {
+						api p
+					}
+				}
+	}
+}

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

@@ -17,5 +17,6 @@
 * Appendices
 ** xref:appendix/version-compatibility.adoc[]
 ** xref:appendix/override-boot-dependencies.adoc[]
+** xref:appendix/getting-dependencies-without-boot.adoc[]
 ** xref:appendix/non-ga-versions.adoc[]
 ** xref:appendix/native-image.adoc[]

spring-pulsar-docs/src/main/antora/modules/ROOT/pages/appendix/getting-dependencies-without-boot.adoc

@@ -0,0 +1,119 @@
+[[deps-without-boot]]
+= Getting Dependencies without Spring Boot
+
+We recommend a Spring Boot first approach when using Spring for Apache Pulsar.
+However, if you do not use Spring Boot, the preferred way to get the dependencies is to use the provided BOM to ensure a consistent version of modules is used throughout your entire project.
+The following example shows how to do so for both Maven and Gradle:
+
+[tabs]
+======
+Maven::
++
+.pom.xml
+[source,xml,indent=0,subs="verbatim,attributes",role="primary"]
+----
+<dependencyManagement>
+	<dependencies>
+		<!-- ... other dependency elements ... -->
+		<dependency>
+			<groupId>org.springframework.pulsar</groupId>
+			<artifactId>spring-pulsar-bom</artifactId>
+			<version>{spring-pulsar-version}</version>
+			<type>pom</type>
+			<scope>import</scope>
+		</dependency>
+	</dependencies>
+</dependencyManagement>
+----
+
+Gradle::
++
+.build.gradle
+[source,groovy,indent=0,subs="verbatim,attributes",role="secondary"]
+----
+plugins {
+	id "io.spring.dependency-management" version "1.1.4"
+}
+
+dependencyManagement {
+	imports {
+		mavenBom 'org.springframework.pulsar:spring-pulsar-bom:{spring-pulsar-version}'
+	}
+}
+----
+======
+
+A minimal Spring for Apache Pulsar set of dependencies typically looks like the following:
+
+[tabs]
+======
+Maven::
++
+.pom.xml
+[source,xml,indent=0,subs="verbatim,attributes",role="primary"]
+----
+<dependencies>
+	<!-- ... other dependency elements ... -->
+	<dependency>
+		<groupId>org.springframework.pulsar</groupId>
+		<artifactId>spring-pulsar</artifactId>
+	</dependency>
+</dependencies>
+----
+
+Gradle::
++
+.build.gradle
+[source,groovy,indent=0,subs="verbatim,attributes",role="secondary"]
+----
+dependencies {
+	implementation "org.springframework.pulsar:spring-pulsar"
+}
+----
+======
+
+If you use additional features (such as Reactive), you need to also include the appropriate dependencies.
+
+Spring for Apache Pulsar builds against Spring Framework {spring-framework-version} but should generally work with any newer version of Spring Framework 6.x.
+Many users are likely to run afoul of the fact that Spring for Apache Pulsar's transitive dependencies resolve Spring Framework {spring-framework-version}, which can cause strange classpath problems.
+The easiest way to resolve this is to use the `spring-framework-bom` within your `dependencyManagement` section as follows:
+
+[tabs]
+======
+Maven::
++
+.pom.xml
+[source,xml,indent=0,subs="verbatim,attributes",role="primary"]
+----
+<dependencyManagement>
+	<dependencies>
+		<!-- ... other dependency elements ... -->
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-framework-bom</artifactId>
+			<version>{spring-framework-version}</version>
+			<type>pom</type>
+			<scope>import</scope>
+		</dependency>
+	</dependencies>
+</dependencyManagement>
+----
+
+Gradle::
++
+.build.gradle
+[source,groovy,indent=0,subs="verbatim,attributes",role="secondary"]
+----
+plugins {
+	id "io.spring.dependency-management" version "1.1.4"
+}
+
+dependencyManagement {
+	imports {
+		mavenBom 'org.springframework:spring-framework-bom:{spring-framework-version}'
+	}
+}
+----
+======
+
+The preceding example ensures that all the transitive dependencies of Spring for Apache Pulsar use the Spring {spring-framework-version} modules.

spring-pulsar-reactive/src/test/java/org/springframework/pulsar/reactive/listener/ReactivePulsarListenerTombstoneTests.java

@@ -238,8 +238,8 @@ class ReactivePulsarListenerTombstoneTests extends ReactivePulsarListenerTestsBa
 			var pulsarProducerFactory = new DefaultPulsarProducerFactory<Foo>(pulsarClient);
 			var fooPulsarTemplate = new PulsarTemplate<>(pulsarProducerFactory);
 			sendTestMessages(fooPulsarTemplate, TOPIC, Schema.JSON(Foo.class), Foo::new);
-			assertThat(latchWithHeaders.await(5, TimeUnit.SECONDS)).isTrue();
-			assertThat(latchWithoutHeaders.await(5, TimeUnit.SECONDS)).isTrue();
+			assertThat(latchWithHeaders.await(10, TimeUnit.SECONDS)).isTrue();
+			assertThat(latchWithoutHeaders.await(10, TimeUnit.SECONDS)).isTrue();
 			assertMessagesReceivedWithHeaders(receivedMessagesWithHeaders, Foo::new);
 			assertMessagesReceivedWithoutHeaders(receivedMessagesWithoutHeaders, Foo::new);
 		}