Merge branch '2.1.x' into 2.2.x

Closes gh-20217

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -38,6 +38,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.core.type.AnnotatedTypeMetadata;
 import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+import org.springframework.util.StringUtils;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for {@link DataSource}.
@@ -122,6 +123,10 @@ public class DataSourceAutoConfiguration {
 		@Override
 		public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
 			ConditionMessage.Builder message = ConditionMessage.forCondition("EmbeddedDataSource");
+			String url = context.getEnvironment().getProperty("spring.datasource.url");
+			if (StringUtils.hasText(url)) {
+				return ConditionOutcome.noMatch(message.found("explicit url").items(url));
+			}
 			if (anyMatches(context, metadata, this.pooledCondition)) {
 				return ConditionOutcome.noMatch(message.foundExactly("supported pooled data source"));
 			}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfigurationTests.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -27,6 +27,7 @@ import java.util.List;
 import java.util.Properties;
 import java.util.Random;
 import java.util.function.Consumer;
+import java.util.function.Function;
 import java.util.logging.Logger;
 
 import javax.sql.DataSource;
@@ -143,15 +144,19 @@ class DataSourceAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void dataSourceWhenNoConnectionPoolsAreAvailableWithUrlDoesNotCreateDataSource() {
+		this.contextRunner.with(hideConnectionPools())
+				.run((context) -> assertThat(context).doesNotHaveBean(DataSource.class));
+	}
+
 	/**
 	 * This test makes sure that if no supported data source is present, a datasource is
 	 * still created if "spring.datasource.type" is present.
 	 */
 	@Test
-	void explicitTypeNoSupportedDataSource() {
-		this.contextRunner
-				.withClassLoader(new FilteredClassLoader("org.apache.tomcat", "com.zaxxer.hikari",
-						"org.apache.commons.dbcp", "org.apache.commons.dbcp2"))
+	void dataSourceWhenNoConnectionPoolsAreAvailableWithUrlAndTypeCreatesDataSource() {
+		this.contextRunner.with(hideConnectionPools())
 				.withPropertyValues("spring.datasource.driverClassName:org.hsqldb.jdbcDriver",
 						"spring.datasource.url:jdbc:hsqldb:mem:testdb",
 						"spring.datasource.type:" + SimpleDriverDataSource.class.getName())
@@ -197,6 +202,11 @@ class DataSourceAutoConfigurationTests {
 						.isTrue());
 	}
 
+	private static Function<ApplicationContextRunner, ApplicationContextRunner> hideConnectionPools() {
+		return (runner) -> runner.withClassLoader(new FilteredClassLoader("org.apache.tomcat", "com.zaxxer.hikari",
+				"org.apache.commons.dbcp", "org.apache.commons.dbcp2"));
+	}
+
 	private <T extends DataSource> void assertDataSource(Class<T> expectedType, List<String> hiddenPackages,
 			Consumer<T> consumer) {
 		FilteredClassLoader classLoader = new FilteredClassLoader(StringUtils.toStringArray(hiddenPackages));