Agroal - Support having no datasource configured

extensions/agroal/deployment/pom.xml

@@ -62,6 +62,12 @@
 
     <build>
         <plugins>
+            <plugin>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <runOrder>alphabetical</runOrder>
+                </configuration>
+            </plugin>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
                 <configuration>

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

@@ -151,15 +151,21 @@ BeanContainerListenerBuildItem build(
 
     @Record(ExecutionTime.RUNTIME_INIT)
     @BuildStep
-    DataSourceInitializedBuildItem configureRuntimeProperties(AgroalTemplate template) {
+    void configureRuntimeProperties(AgroalTemplate template,
+            BuildProducer<DataSourceInitializedBuildItem> dataSourceInitialized) {
+        if (!agroalBuildTimeConfig.defaultDataSource.driver.isPresent() && agroalBuildTimeConfig.namedDataSources.isEmpty()) {
+            // No datasource has been configured so bail out
+            return;
+        }
+
         // TODO @dmlloyd
         // Here we have the first issue:
         // - things are working well for the default database
         // - we have the datasource1 and datasource2 elements in the map but the values are not injected
         // - as mentioned above, it doesn't seem to be an issue for the build time config I use in the above method...
         template.configureRuntimeProperties(agroalRuntimeConfig);
 
-        return new DataSourceInitializedBuildItem();
+        dataSourceInitialized.produce(new DataSourceInitializedBuildItem());
     }
 
     @BuildStep

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

@@ -0,0 +1,22 @@
+package io.quarkus.agroal.test;
+
+import java.sql.SQLException;
+
+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.quarkus.test.QuarkusUnitTest;
+
+public class NoConfigTest {
+
+    @RegisterExtension
+    static final QuarkusUnitTest config = new QuarkusUnitTest().setArchiveProducer(
+            () -> ShrinkWrap.create(JavaArchive.class));
+
+    @Test
+    public void testNoConfig() throws SQLException {
+        // we should be able to start the application, even with no configuration at all
+    }
+}