Introduce UnsafeAccessedFieldBuildItem

core/deployment/src/main/java/io/quarkus/deployment/builditem/nativeimage/UnsafeAccessedFieldBuildItem.java

@@ -0,0 +1,22 @@
+package io.quarkus.deployment.builditem.nativeimage;
+
+import io.quarkus.builder.item.MultiBuildItem;
+
+public final class UnsafeAccessedFieldBuildItem extends MultiBuildItem {
+
+    final String declaringClass;
+    final String fieldName;
+
+    public UnsafeAccessedFieldBuildItem(String declaringClass, String fieldName) {
+        this.declaringClass = declaringClass;
+        this.fieldName = fieldName;
+    }
+
+    public String getDeclaringClass() {
+        return declaringClass;
+    }
+
+    public String getFieldName() {
+        return fieldName;
+    }
+}

core/deployment/src/main/java/io/quarkus/deployment/steps/NativeImageAutoFeatureStep.java

@@ -32,6 +32,7 @@
 import io.quarkus.deployment.builditem.nativeimage.RuntimeInitializedClassBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.RuntimeReinitializedClassBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.ServiceProviderBuildItem;
+import io.quarkus.deployment.builditem.nativeimage.UnsafeAccessedFieldBuildItem;
 import io.quarkus.gizmo.CatchBlockCreator;
 import io.quarkus.gizmo.ClassCreator;
 import io.quarkus.gizmo.ClassOutput;
@@ -65,7 +66,8 @@ void generateFeature(BuildProducer<GeneratedNativeImageClassBuildItem> nativeIma
             List<ReflectiveMethodBuildItem> reflectiveMethods,
             List<ReflectiveFieldBuildItem> reflectiveFields,
             List<ReflectiveClassBuildItem> reflectiveClassBuildItems,
-            List<ServiceProviderBuildItem> serviceProviderBuildItems) {
+            List<ServiceProviderBuildItem> serviceProviderBuildItems,
+            List<UnsafeAccessedFieldBuildItem> unsafeAccessedFields) {
         ClassCreator file = new ClassCreator(new ClassOutput() {
             @Override
             public void write(String s, byte[] bytes) {
@@ -80,6 +82,22 @@ public void write(String s, byte[] bytes) {
         TryBlock overallCatch = beforeAn.tryBlock();
         //TODO: at some point we are going to need to break this up, as if it get too big it will hit the method size limit
 
+        ResultHandle beforeAnalysisParam = beforeAn.getMethodParam(0);
+        for (UnsafeAccessedFieldBuildItem unsafeAccessedField : unsafeAccessedFields) {
+            TryBlock tc = overallCatch.tryBlock();
+            ResultHandle declaringClassHandle = tc.invokeStaticMethod(
+                    ofMethod(Class.class, "forName", Class.class, String.class),
+                    tc.load(unsafeAccessedField.getDeclaringClass()));
+            ResultHandle fieldHandle = tc.invokeVirtualMethod(
+                    ofMethod(Class.class, "getDeclaredField", Field.class, String.class), declaringClassHandle,
+                    tc.load(unsafeAccessedField.getFieldName()));
+            tc.invokeInterfaceMethod(
+                    ofMethod(Feature.BeforeAnalysisAccess.class, "registerAsUnsafeAccessed", void.class, Field.class),
+                    beforeAnalysisParam, fieldHandle);
+            CatchBlockCreator cc = tc.addCatch(Throwable.class);
+            cc.invokeVirtualMethod(ofMethod(Throwable.class, "printStackTrace", void.class), cc.getCaughtException());
+        }
+
         ResultHandle initSingleton = overallCatch.invokeStaticMethod(IMAGE_SINGLETONS_LOOKUP,
                 overallCatch.loadClass(RuntimeClassInitializationSupport.class));
         ResultHandle quarkus = overallCatch.load("Quarkus");

extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java

@@ -1,5 +1,7 @@
 package io.quarkus.netty.deployment;
 
+import java.util.Arrays;
+import java.util.List;
 import java.util.Optional;
 import java.util.function.Supplier;
 
@@ -21,6 +23,7 @@
 import io.quarkus.deployment.builditem.nativeimage.NativeImageSystemPropertyBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.RuntimeReinitializedClassBuildItem;
+import io.quarkus.deployment.builditem.nativeimage.UnsafeAccessedFieldBuildItem;
 import io.quarkus.netty.BossEventLoopGroup;
 import io.quarkus.netty.MainEventLoopGroup;
 import io.quarkus.netty.runtime.NettyRecorder;
@@ -177,4 +180,12 @@ public RuntimeReinitializedClassBuildItem reinitScheduledFutureTask() {
         return new RuntimeReinitializedClassBuildItem(
                 "io.quarkus.netty.runtime.graal.Holder_io_netty_util_concurrent_ScheduledFutureTask");
     }
+
+    // TODO: Remove this when netty.version is 4.1.43.Final or greater.
+    @BuildStep
+    public List<UnsafeAccessedFieldBuildItem> unsafeAccessedFields() {
+        return Arrays.asList(
+                new UnsafeAccessedFieldBuildItem("sun.nio.ch.SelectorImpl", "selectedKeys"),
+                new UnsafeAccessedFieldBuildItem("sun.nio.ch.SelectorImpl", "publicSelectedKeys"));
+    }
 }