Improve diagnostics when no DSLContext due to R2DBC

Fixes gh-28378

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jooq/NoDslContextBeanFailureAnalyzer.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2012-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.jooq;
+
+import org.jooq.DSLContext;
+
+import org.springframework.beans.BeansException;
+import org.springframework.beans.factory.BeanFactory;
+import org.springframework.beans.factory.BeanFactoryAware;
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration;
+import org.springframework.boot.diagnostics.AbstractFailureAnalyzer;
+import org.springframework.boot.diagnostics.FailureAnalysis;
+import org.springframework.core.Ordered;
+
+class NoDslContextBeanFailureAnalyzer extends AbstractFailureAnalyzer<NoSuchBeanDefinitionException>
+		implements Ordered, BeanFactoryAware {
+
+	private BeanFactory beanFactory;
+
+	@Override
+	protected FailureAnalysis analyze(Throwable rootFailure, NoSuchBeanDefinitionException cause) {
+		if (DSLContext.class.equals(cause.getBeanType()) && hasR2dbcAutoConfiguration()) {
+			return new FailureAnalysis(
+					"jOOQ has not been auto-configured as R2DBC has been auto-configured in favor of JDBC and jOOQ "
+							+ "auto-configuration does not yet support R2DBC. ",
+					"To use jOOQ with JDBC, exclude R2dbcAutoConfiguration. To use jOOQ with R2DBC, define your own "
+							+ "jOOQ configuration.",
+					cause);
+		}
+		return null;
+	}
+
+	private boolean hasR2dbcAutoConfiguration() {
+		try {
+			this.beanFactory.getBean(R2dbcAutoConfiguration.class);
+			return true;
+		}
+		catch (Exception ex) {
+			return false;
+		}
+	}
+
+	@Override
+	public int getOrder() {
+		return 0;
+	}
+
+	@Override
+	public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
+		this.beanFactory = beanFactory;
+
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -157,6 +157,7 @@ org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinition
 org.springframework.boot.autoconfigure.flyway.FlywayMigrationScriptMissingFailureAnalyzer,\
 org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\
 org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer,\
+org.springframework.boot.autoconfigure.jooq.NoDslContextBeanFailureAnalyzer,\
 org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryBeanCreationFailureAnalyzer,\
 org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jooq/NoDslContextBeanFailureAnalyzerTests.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2012-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.autoconfigure.jooq;
+
+import org.jooq.DSLContext;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.NoSuchBeanDefinitionException;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link NoDslContextBeanFailureAnalyzer}.
+ *
+ * @author Andy Wilkinson
+ */
+class NoDslContextBeanFailureAnalyzerTests {
+
+	private final NoDslContextBeanFailureAnalyzer failureAnalyzer = new NoDslContextBeanFailureAnalyzer();
+
+	@Test
+	void noAnalysisWithoutR2dbcAutoConfiguration() {
+		new ApplicationContextRunner().run((context) -> {
+			this.failureAnalyzer.setBeanFactory(context.getBeanFactory());
+			assertThat(this.failureAnalyzer.analyze(new NoSuchBeanDefinitionException(DSLContext.class))).isNull();
+		});
+	}
+
+	@Test
+	void analysisWithR2dbcAutoConfiguration() {
+		new ApplicationContextRunner().withConfiguration(AutoConfigurations.of(R2dbcAutoConfiguration.class))
+				.run((context) -> {
+					this.failureAnalyzer.setBeanFactory(context.getBeanFactory());
+					assertThat(this.failureAnalyzer.analyze(new NoSuchBeanDefinitionException(DSLContext.class)))
+							.isNotNull();
+				});
+	}
+
+}