Configure ActiveMQConnectionFactory properly without spring-jms

Previously, if spring-jms is not available and a non-pool connection
factory is requested (the default), no `CachingConnectionFactory` is
created. This commit makes sure to separate the two conditions, so
that a connection factory can be obtained even if spring-jms is not
on the classpath.

See gh-36767

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jms/artemis/ArtemisConnectionFactoryConfiguration.java

@@ -44,41 +44,40 @@ import org.springframework.jms.connection.CachingConnectionFactory;
 class ArtemisConnectionFactoryConfiguration {
 
 	@Configuration(proxyBeanMethods = false)
-	@ConditionalOnClass(CachingConnectionFactory.class)
 	@ConditionalOnProperty(prefix = "spring.artemis.pool", name = "enabled", havingValue = "false",
 			matchIfMissing = true)
 	static class SimpleConnectionFactoryConfiguration {
 
-		private final ArtemisProperties properties;
-
-		private final ListableBeanFactory beanFactory;
+		@Bean(name = "jmsConnectionFactory")
+		@ConditionalOnProperty(prefix = "spring.jms.cache", name = "enabled", havingValue = "false")
+		ActiveMQConnectionFactory jmsConnectionFactory(ArtemisProperties properties, ListableBeanFactory beanFactory) {
+			return createConnectionFactory(properties, beanFactory);
+		}
 
-		SimpleConnectionFactoryConfiguration(ArtemisProperties properties, ListableBeanFactory beanFactory) {
-			this.properties = properties;
-			this.beanFactory = beanFactory;
+		private static ActiveMQConnectionFactory createConnectionFactory(ArtemisProperties properties,
+				ListableBeanFactory beanFactory) {
+			return new ArtemisConnectionFactoryFactory(beanFactory, properties)
+				.createConnectionFactory(ActiveMQConnectionFactory.class);
 		}
 
-		@Bean(name = "jmsConnectionFactory")
+		@Configuration(proxyBeanMethods = false)
+		@ConditionalOnClass(CachingConnectionFactory.class)
 		@ConditionalOnProperty(prefix = "spring.jms.cache", name = "enabled", havingValue = "true",
 				matchIfMissing = true)
-		CachingConnectionFactory cachingJmsConnectionFactory(JmsProperties jmsProperties) {
-			JmsProperties.Cache cacheProperties = jmsProperties.getCache();
-			CachingConnectionFactory connectionFactory = new CachingConnectionFactory(createConnectionFactory());
-			connectionFactory.setCacheConsumers(cacheProperties.isConsumers());
-			connectionFactory.setCacheProducers(cacheProperties.isProducers());
-			connectionFactory.setSessionCacheSize(cacheProperties.getSessionCacheSize());
-			return connectionFactory;
-		}
-
-		@Bean(name = "jmsConnectionFactory")
-		@ConditionalOnProperty(prefix = "spring.jms.cache", name = "enabled", havingValue = "false")
-		ActiveMQConnectionFactory jmsConnectionFactory() {
-			return createConnectionFactory();
-		}
+		static class CachingConnectionFactoryConfiguration {
+
+			@Bean(name = "jmsConnectionFactory")
+			CachingConnectionFactory cachingJmsConnectionFactory(JmsProperties jmsProperties,
+					ArtemisProperties properties, ListableBeanFactory beanFactory) {
+				JmsProperties.Cache cacheProperties = jmsProperties.getCache();
+				CachingConnectionFactory connectionFactory = new CachingConnectionFactory(
+						createConnectionFactory(properties, beanFactory));
+				connectionFactory.setCacheConsumers(cacheProperties.isConsumers());
+				connectionFactory.setCacheProducers(cacheProperties.isProducers());
+				connectionFactory.setSessionCacheSize(cacheProperties.getSessionCacheSize());
+				return connectionFactory;
+			}
 
-		private ActiveMQConnectionFactory createConnectionFactory() {
-			return new ArtemisConnectionFactoryFactory(this.beanFactory, this.properties)
-				.createConnectionFactory(ActiveMQConnectionFactory.class);
 		}
 
 	}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jms/artemis/ArtemisAutoConfigurationTests.java

@@ -47,6 +47,7 @@ import org.messaginghub.pooled.jms.JmsPoolConnectionFactory;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration;
+import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.assertj.AssertableApplicationContext;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.ApplicationContext;
@@ -357,6 +358,20 @@ class ArtemisAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void cachingConnectionFactoryNotOnTheClasspathThenSimpleConnectionFactoryAutoConfigured() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(CachingConnectionFactory.class))
+			.withPropertyValues("spring.artemis.pool.enabled=false", "spring.jms.cache.enabled=false")
+			.run((context) -> assertThat(context).hasSingleBean(ActiveMQConnectionFactory.class));
+	}
+
+	@Test
+	void cachingConnectionFactoryNotOnTheClasspathAndCacheEnabledThenSimpleConnectionFactoryNotConfigured() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(CachingConnectionFactory.class))
+			.withPropertyValues("spring.artemis.pool.enabled=false", "spring.jms.cache.enabled=true")
+			.run((context) -> assertThat(context).doesNotHaveBean(ActiveMQConnectionFactory.class));
+	}
+
 	private ConnectionFactory getConnectionFactory(AssertableApplicationContext context) {
 		assertThat(context).hasSingleBean(ConnectionFactory.class).hasBean("jmsConnectionFactory");
 		ConnectionFactory connectionFactory = context.getBean(ConnectionFactory.class);