DevDB Support

DevDB allows for zero configuration databases in dev
and test mode, either starting the databases using
testcontainers, or creating them in process.

bom/application/pom.xml

@@ -208,6 +208,7 @@
         <log4j2-jboss-logmanager.version>1.0.0.Beta1</log4j2-jboss-logmanager.version>
         <log4j-jboss-logmanager.version>1.2.0.Final</log4j-jboss-logmanager.version>
         <avro.version>1.10.0</avro.version>
+        <testcontainers.version>1.15.1</testcontainers.version>
     </properties>
 
     <dependencyManagement>
@@ -321,6 +322,14 @@
                 <scope>import</scope>
             </dependency>
 
+            <!-- Testcontainers, imported as BOM -->
+            <dependency>
+                <groupId>org.testcontainers</groupId>
+                <artifactId>testcontainers-bom</artifactId>
+                <version>${testcontainers.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
             <!-- Quarkus core -->
 
             <dependency>
@@ -506,6 +515,11 @@
                 <artifactId>quarkus-datasource-common</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-datasource-deployment-spi</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>io.quarkus</groupId>
                 <artifactId>quarkus-datasource</artifactId>
@@ -516,6 +530,31 @@
                 <artifactId>quarkus-datasource-deployment</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-devdb-postgresql</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-devdb-h2</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-devdb-mysql</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-devdb-mariadb</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.quarkus</groupId>
+                <artifactId>quarkus-devdb-derby</artifactId>
+                <version>${project.version}</version>
+            </dependency>
             <dependency>
                 <groupId>io.quarkus</groupId>
                 <artifactId>quarkus-elasticsearch-rest-client-common</artifactId>

build-parent/pom.xml

@@ -481,14 +481,12 @@
                                             <exclude>io.rest-assured:*</exclude>
                                             <exclude>org.assertj:*</exclude>
                                             <exclude>org.junit.jupiter:*</exclude>
-                                            <exclude>org.testcontainers:*</exclude>
                                         </excludes>
                                         <includes>
                                             <include>io.quarkus:quarkus-test-*:*:*:test</include>
                                             <include>io.rest-assured:*:*:*:test</include>
                                             <include>org.assertj:*:*:*:test</include>
                                             <include>org.junit.jupiter:*:*:*:test</include>
-                                            <include>org.testcontainers:*:*:*:test</include>
                                         </includes>
                                         <message>Found test dependencies with wrong scope:</message>
                                     </bannedDependencies>

core/deployment/src/main/java/io/quarkus/runner/bootstrap/AugmentActionImpl.java

@@ -1,9 +1,11 @@
 package io.quarkus.runner.bootstrap;
 
 import java.io.File;
+import java.lang.reflect.InvocationTargetException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.StandardOpenOption;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
@@ -13,6 +15,7 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
+import java.util.function.Function;
 import java.util.stream.Collectors;
 
 import org.eclipse.microprofile.config.spi.ConfigProviderResolver;
@@ -132,6 +135,55 @@ public AugmentActionImpl(CuratedApplication curatedApplication, List<Consumer<Bu
         this.devModeType = devModeType;
     }
 
+    @Override
+    public void performCustomBuild(String resultHandler, Object context, String... finalOutputs) {
+        ClassLoader classLoader = curatedApplication.createDeploymentClassLoader();
+        Class<? extends BuildItem>[] targets = Arrays.stream(finalOutputs)
+                .map(new Function<String, Class<? extends BuildItem>>() {
+                    @Override
+                    public Class<? extends BuildItem> apply(String s) {
+                        try {
+                            return (Class<? extends BuildItem>) Class.forName(s, false, classLoader);
+                        } catch (ClassNotFoundException e) {
+                            throw new RuntimeException(e);
+                        }
+                    }
+                }).toArray(Class[]::new);
+        BuildResult result = runAugment(true, Collections.emptySet(), null, classLoader, targets);
+
+        String debugSourcesDir = BootstrapDebug.DEBUG_SOURCES_DIR;
+        if (debugSourcesDir != null) {
+            for (GeneratedClassBuildItem i : result.consumeMulti(GeneratedClassBuildItem.class)) {
+                try {
+                    if (i.getSource() != null) {
+                        File debugPath = new File(debugSourcesDir);
+                        if (!debugPath.exists()) {
+                            debugPath.mkdir();
+                        }
+                        File sourceFile = new File(debugPath, i.getName() + ".zig");
+                        sourceFile.getParentFile().mkdirs();
+                        Files.write(sourceFile.toPath(), i.getSource().getBytes(StandardCharsets.UTF_8),
+                                StandardOpenOption.CREATE);
+                        log.infof("Wrote source: %s", sourceFile.getAbsolutePath());
+                    } else {
+                        log.infof("Source not available: %s", i.getName());
+                    }
+                } catch (Exception t) {
+                    log.errorf(t, "Failed to write debug source file: %s", i.getName());
+                }
+            }
+        }
+        try {
+            BiConsumer<Object, BuildResult> consumer = (BiConsumer<Object, BuildResult>) Class
+                    .forName(resultHandler, false, classLoader)
+                    .getConstructor().newInstance();
+            consumer.accept(context, result);
+        } catch (InstantiationException | IllegalAccessException | NoSuchMethodException | ClassNotFoundException
+                | InvocationTargetException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
     @Override
     public AugmentResult createProductionApplication() {
         if (launchMode != LaunchMode.NORMAL) {

docs/src/main/asciidoc/datasource.adoc

@@ -40,6 +40,21 @@ please refer to the link:reactive-sql-clients[Reactive SQL clients guide].
 This is a quick introduction to datasource configuration.
 If you want a better understanding of how all this works, this guide has a lot more information in the subsequent paragraphs.
 
+=== Zero Config Setup (DevDB)
+
+When testing or running in dev mode Quarkus can even provide you with a zero config database out of the box, a feature
+we refer to as DevDB. DevDB is supported for the following open source databases:
+
+* Postgresql
+* MySQL
+* MariaDB
+* H2
+* Apache Derby
+
+If you want to use DevDB then all you need to do is include the relevant extension for the type of database you want (either reactive or
+JDBC, or both), and don't configure a database URL, username and password, Quarkus will provide the database and you can just start
+coding without worrying about config.
+
 === JDBC datasource
 
 Add the `agroal` extension plus one of `jdbc-db2`, `jdbc-derby`, `jdbc-h2`, `jdbc-mariadb`, `jdbc-mssql`, `jdbc-mysql`, or `jdbc-postgresql`.
@@ -48,13 +63,16 @@ Then configure your datasource:
 
 [source, properties]
 ----
-quarkus.datasource.db-kind=postgresql
+quarkus.datasource.db-kind=postgresql <1>
 quarkus.datasource.username=<your username>
 quarkus.datasource.password=<your password>
 
 quarkus.datasource.jdbc.url=jdbc:postgresql://localhost:5432/hibernate_orm_test
 quarkus.datasource.jdbc.max-size=16
 ----
+<1> If you only have a single JDBC extension, or you are running tests and only have a single test scoped JDBC extension installed then this is
+optional. If there is only once possible extension we assume this is the correct one, and if a driver has been added with test scope then
+we assume that this should be used in testing.
 
 === Reactive datasource
 
@@ -64,20 +82,22 @@ Then configure your reactive datasource:
 
 [source, properties]
 ----
-quarkus.datasource.db-kind=postgresql
+quarkus.datasource.db-kind=postgresql<1>
 quarkus.datasource.username=<your username>
 quarkus.datasource.password=<your password>
 
 quarkus.datasource.reactive.url=postgresql:///your_database
 quarkus.datasource.reactive.max-size=20
 ----
+<1> As specified above this is optional.
 
 == Default datasource
 
 A datasource can be either a JDBC datasource, a reactive one or both.
 It all depends on how you configure it and which extensions you added to your project.
 
-To define a datasource, start with the following:
+To define a datasource, start with the following (note that this is only required if you have more than one
+database type installed):
 
 [source, properties]
 ----
@@ -382,6 +402,10 @@ quarkus.datasource.inventory.jdbc.max-size=12
 Notice there is an extra bit in the key.
 The syntax is as follows: `quarkus.datasource.[optional name.][datasource property]`.
 
+NOTE: Even when only one database extension is installed named databases need to specify at least one build time
+property so that Quarkus knows they exist. Generally this will be the `db-kind` property, although you can also
+specify DevDB properties to create named datasources (covered later in this guide).
+
 === Named Datasource Injection
 
 When using multiple datasources, each `DataSource` also has the `io.quarkus.agroal.DataSource` qualifier with the name of the datasource as the value.
@@ -435,6 +459,28 @@ If the Narayana JTA extension is also available, integration is automatic.
 
 You can override this by setting the `transactions` configuration property - see the <<configuration-reference, Configuration Reference>> below.
 
+== DevDb (Configuration Free Databases)
+
+As mentioned above Quarkus supports a feature called DevDB that allows you to create datasources without any config. If
+you have a database extension that supports it and not config is provided Quarkus all automatcally start a database (either
+using Testcontainers, or by starting a Java DB in process), and automatically configure a connection to this database.
+
+Production databases need to be configured as normal, so if you want to include a production database config in your
+application.properties and continue to use DevDB it is recommended that you use the `%prod.` profile to define your
+database settings.
+
+=== Configuring DevDB
+
+DevDB supports the following config options:
+
+include::{generated-dir}/config/quarkus-datasource-config-group-dev-db-build-time-config.adoc[opts=optional, leveloffset=+1]
+
+=== Named Datasources
+
+When using DevDB the default datasource will always be created, but to specify a named datasource you need to have
+at least one build time property so Quarkus knows to create the datasource. In general you will usually either specify
+the `db-kind` property, or explicitly enable DevDb: `quarkus.datasource."named".devdb=true`.
+
 [[in-memory-databases]]
 == Testing with in-memory databases
 

extensions/agroal/deployment/src/main/java/io/quarkus/agroal/deployment/AgroalProcessor.java

@@ -24,13 +24,13 @@
 import io.quarkus.agroal.runtime.DataSources;
 import io.quarkus.agroal.runtime.DataSourcesJdbcBuildTimeConfig;
 import io.quarkus.agroal.runtime.TransactionIntegration;
-import io.quarkus.agroal.spi.DefaultDataSourceDbKindBuildItem;
 import io.quarkus.agroal.spi.JdbcDataSourceBuildItem;
 import io.quarkus.agroal.spi.JdbcDriverBuildItem;
 import io.quarkus.arc.deployment.AdditionalBeanBuildItem;
 import io.quarkus.arc.deployment.SyntheticBeanBuildItem;
 import io.quarkus.arc.processor.DotNames;
 import io.quarkus.datasource.common.runtime.DataSourceUtil;
+import io.quarkus.datasource.deployment.spi.DefaultDataSourceDbKindBuildItem;
 import io.quarkus.datasource.runtime.DataSourceBuildTimeConfig;
 import io.quarkus.datasource.runtime.DataSourcesBuildTimeConfig;
 import io.quarkus.datasource.runtime.DataSourcesRuntimeConfig;
@@ -47,6 +47,7 @@
 import io.quarkus.deployment.builditem.SslNativeConfigBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.NativeImageResourceBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
+import io.quarkus.deployment.pkg.builditem.CurateOutcomeBuildItem;
 import io.quarkus.runtime.configuration.ConfigurationException;
 import io.quarkus.smallrye.health.deployment.spi.HealthBuildItem;
 
@@ -73,7 +74,8 @@ void build(
             BuildProducer<ReflectiveClassBuildItem> reflectiveClass,
             BuildProducer<NativeImageResourceBuildItem> resource,
             BuildProducer<ExtensionSslNativeSupportBuildItem> sslNativeSupport,
-            BuildProducer<AggregatedDataSourceBuildTimeConfigBuildItem> aggregatedConfig) throws Exception {
+            BuildProducer<AggregatedDataSourceBuildTimeConfigBuildItem> aggregatedConfig,
+            CurateOutcomeBuildItem curateOutcomeBuildItem) throws Exception {
         if (dataSourcesBuildTimeConfig.driver.isPresent() || dataSourcesBuildTimeConfig.url.isPresent()) {
             throw new ConfigurationException(
                     "quarkus.datasource.url and quarkus.datasource.driver have been deprecated in Quarkus 1.3 and removed in 1.9. "
@@ -82,7 +84,7 @@ void build(
 
         List<AggregatedDataSourceBuildTimeConfigBuildItem> aggregatedDataSourceBuildTimeConfigs = getAggregatedConfigBuildItems(
                 dataSourcesBuildTimeConfig,
-                dataSourcesJdbcBuildTimeConfig,
+                dataSourcesJdbcBuildTimeConfig, curateOutcomeBuildItem,
                 jdbcDriverBuildItems, defaultDbKinds);
 
         if (aggregatedDataSourceBuildTimeConfigs.isEmpty()) {
@@ -257,13 +259,12 @@ void generateDataSourceBeans(AgroalRecorder recorder,
     private List<AggregatedDataSourceBuildTimeConfigBuildItem> getAggregatedConfigBuildItems(
             DataSourcesBuildTimeConfig dataSourcesBuildTimeConfig,
             DataSourcesJdbcBuildTimeConfig dataSourcesJdbcBuildTimeConfig,
+            CurateOutcomeBuildItem curateOutcomeBuildItem,
             List<JdbcDriverBuildItem> jdbcDriverBuildItems, List<DefaultDataSourceDbKindBuildItem> defaultDbKinds) {
         List<AggregatedDataSourceBuildTimeConfigBuildItem> dataSources = new ArrayList<>();
 
-        Optional<String> effectiveDbKind = dataSourcesBuildTimeConfig.defaultDataSource.dbKind;
-        if (!effectiveDbKind.isPresent() && (defaultDbKinds.size() == 1)) {
-            effectiveDbKind = Optional.of(defaultDbKinds.get(0).getDbKind());
-        }
+        Optional<String> effectiveDbKind = DefaultDataSourceDbKindBuildItem
+                .resolve(dataSourcesBuildTimeConfig.defaultDataSource.dbKind, defaultDbKinds, curateOutcomeBuildItem);
 
         if (effectiveDbKind.isPresent()) {
             if (dataSourcesJdbcBuildTimeConfig.jdbc.enabled) {
@@ -282,11 +283,16 @@ private List<AggregatedDataSourceBuildTimeConfigBuildItem> getAggregatedConfigBu
             if (!jdbcBuildTimeConfig.enabled) {
                 continue;
             }
+            Optional<String> dbKind = DefaultDataSourceDbKindBuildItem
+                    .resolve(entry.getValue().dbKind, defaultDbKinds, curateOutcomeBuildItem);
+            if (!dbKind.isPresent()) {
+                continue;
+            }
             dataSources.add(new AggregatedDataSourceBuildTimeConfigBuildItem(entry.getKey(),
                     entry.getValue(),
                     jdbcBuildTimeConfig,
-                    entry.getValue().dbKind.get(),
-                    resolveDriver(entry.getKey(), entry.getValue().dbKind.get(), jdbcBuildTimeConfig, jdbcDriverBuildItems)));
+                    dbKind.get(),
+                    resolveDriver(entry.getKey(), dbKind.get(), jdbcBuildTimeConfig, jdbcDriverBuildItems)));
         }
 
         return dataSources;

extensions/agroal/deployment/src/test/java/io/quarkus/agroal/test/MultipleDevDBDataSourcesConfigTest.java

@@ -0,0 +1,45 @@
+package io.quarkus.agroal.test;
+
+import static io.quarkus.agroal.test.MultipleDataSourcesTestUtil.testDataSource;
+
+import java.sql.SQLException;
+
+import javax.inject.Inject;
+
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.agroal.api.AgroalDataSource;
+import io.quarkus.agroal.DataSource;
+import io.quarkus.test.QuarkusUnitTest;
+
+public class MultipleDevDBDataSourcesConfigTest {
+
+    //tag::injection[]
+    @Inject
+    AgroalDataSource defaultDataSource;
+
+    @Inject
+    @DataSource("users")
+    AgroalDataSource dataSource1;
+
+    @Inject
+    @DataSource("inventory")
+    AgroalDataSource dataSource2;
+    //end::injection[]
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest()
+            .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
+                    .addClass(MultipleDataSourcesTestUtil.class))
+            .withConfigurationResource("application-multiple-devdb-datasources.properties");
+
+    @Test
+    public void testDataSourceInjection() throws SQLException {
+        testDataSource("default", defaultDataSource, "jdbc:h2:tcp://localhost/mem:default;DB_CLOSE_DELAY=-1", "sa", 20);
+        testDataSource("users", dataSource1, "jdbc:h2:tcp://localhost/mem:users;DB_CLOSE_DELAY=-1", "sa", 20);
+        testDataSource("inventory", dataSource2, "jdbc:h2:tcp://localhost/mem:inventory;DB_CLOSE_DELAY=-1", "sa", 20);
+    }
+}

extensions/agroal/deployment/src/test/resources/application-multiple-devdb-datasources.properties

@@ -0,0 +1,2 @@
+quarkus.datasource.users.devdb=true
+quarkus.datasource.inventory.devdb=true