OpenTelemetry JDBC instrumentation - register Oracle driver manually

fixes: #28915

core/deployment/src/main/java/io/quarkus/deployment/Capability.java

@@ -134,4 +134,5 @@ public interface Capability {
     String KAFKA = QUARKUS_PREFIX + "kafka";
 
     String SMALLRYE_REACTIVE_MESSAGING = QUARKUS_PREFIX + "smallrye.reactive.messaging";
+    String JDBC_ORACLE = QUARKUS_PREFIX + "jdbc.oracle";
 }

extensions/jdbc/jdbc-oracle/runtime/pom.xml

@@ -43,6 +43,11 @@
             <plugin>
                 <groupId>io.quarkus</groupId>
                 <artifactId>quarkus-extension-maven-plugin</artifactId>
+                <configuration>
+                    <capabilities>
+                        <provides>io.quarkus.jdbc.oracle</provides>
+                    </capabilities>
+                </configuration>
             </plugin>
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>

extensions/opentelemetry/deployment/src/main/java/io/quarkus/opentelemetry/deployment/OpenTelemetryProcessor.java

@@ -173,4 +173,17 @@ void createOpenTelemetry(
     void storeVertxOnContextStorage(OpenTelemetryRecorder recorder, CoreVertxBuildItem vertx) {
         recorder.storeVertxOnContextStorage(vertx.getVertx());
     }
+
+    /**
+     * 'OracleDriver' register itself as driver in static initialization block, however we don't want to
+     * force runtime initialization for compatibility reasons, for more information please check:
+     * io.quarkus.jdbc.oracle.deployment.OracleMetadataOverrides#runtimeInitializeDriver
+     */
+    @BuildStep
+    @Record(ExecutionTime.RUNTIME_INIT)
+    void registerOracleDriver(Capabilities capabilities, OpenTelemetryRecorder recorder) {
+        if (capabilities.isPresent(Capability.JDBC_ORACLE)) {
+            recorder.registerOracleDriver();
+        }
+    }
 }

extensions/opentelemetry/runtime/src/main/java/io/quarkus/opentelemetry/runtime/OpenTelemetryRecorder.java

@@ -1,7 +1,13 @@
 package io.quarkus.opentelemetry.runtime;
 
+import java.lang.reflect.InvocationTargetException;
+import java.sql.Driver;
+import java.sql.DriverManager;
+import java.sql.SQLException;
 import java.util.function.Supplier;
 
+import org.jboss.logging.Logger;
+
 import io.opentelemetry.api.GlobalOpenTelemetry;
 import io.opentelemetry.api.OpenTelemetry;
 import io.opentelemetry.context.ContextStorage;
@@ -16,6 +22,8 @@
 @Recorder
 public class OpenTelemetryRecorder {
 
+    private static final Logger LOG = Logger.getLogger(OpenTelemetryRecorder.class);
+
     /* STATIC INIT */
     public void resetGlobalOpenTelemetryForDevMode() {
         GlobalOpenTelemetry.resetForTest();
@@ -46,4 +54,25 @@ public void eagerlyCreateContextStorage() {
     public void storeVertxOnContextStorage(Supplier<Vertx> vertx) {
         QuarkusContextStorage.vertx = vertx.get();
     }
+
+    public void registerOracleDriver() {
+        try {
+            var constructors = Class
+                    .forName("oracle.jdbc.driver.OracleDriver", true, Thread.currentThread().getContextClassLoader())
+                    .getConstructors();
+            if (constructors.length == 1) {
+                // register OracleDriver
+                DriverManager.registerDriver((Driver) constructors[0].newInstance());
+            } else {
+                // we need default constructor, ATM there is just one
+                LOG.warn(
+                        "Class 'oracle.jdbc.driver.OracleDriver' has more than one constructor and won't be registered as driver."
+                                +
+                                " JDBC instrumentation might not work properly in native mode.");
+            }
+        } catch (SQLException | InvocationTargetException | InstantiationException | IllegalAccessException
+                | ClassNotFoundException e) {
+            LOG.warn("Failed to register Oracle driver. JDBC instrumentation might not work properly in native mode.");
+        }
+    }
 }

integration-tests/opentelemetry-jdbc-instrumentation/README.md

@@ -0,0 +1,16 @@
+# OpenTelemetry JDBC instrumentation example
+
+## Running the tests
+
+
+To run the tests in a standard JVM with an Oracle database started as a Docker container, you can run the following command:
+
+```
+mvn verify -Dtest-containers
+```
+
+To also test as a native image, add `-Dnative`:
+
+```
+mvn verify -Dtest-containers -Dnative
+```