Validate that Kotlin entities do not extend PanacheEntity and also declare its own ID

extensions/panache/hibernate-orm-panache-kotlin/deployment/pom.xml

@@ -86,6 +86,41 @@
                     </annotationProcessorPaths>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.jetbrains.kotlin</groupId>
+                <artifactId>kotlin-maven-plugin</artifactId>
+                <version>${kotlin.version}</version>
+                <executions>
+                    <execution>
+                        <id>compile</id>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <source>src/main/java</source>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>test-compile</id>
+                        <phase>test-compile</phase>
+                        <goals>
+                            <goal>test-compile</goal>
+                        </goals>
+                        <configuration>
+                            <sourceDirs>
+                                <source>src/test/java</source>
+                                <source>src/test/kotlin</source>
+                            </sourceDirs>
+                        </configuration>
+                    </execution>
+                </executions>
+                <configuration>
+                    <jvmTarget>1.8</jvmTarget>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 

extensions/panache/hibernate-orm-panache-kotlin/deployment/src/main/java/io/quarkus/hibernate/orm/panache/kotlin/deployment/KotlinPanacheResourceProcessor.java

@@ -16,14 +16,18 @@
 import java.util.stream.Collectors;
 
 import javax.persistence.EntityManager;
+import javax.persistence.Id;
 import javax.persistence.Transient;
 
+import org.jboss.jandex.AnnotationInstance;
 import org.jboss.jandex.ClassInfo;
 import org.jboss.jandex.DotName;
 import org.jboss.jandex.Type;
 
 import io.quarkus.arc.deployment.UnremovableBeanBuildItem;
+import io.quarkus.arc.deployment.ValidationPhaseBuildItem;
 import io.quarkus.arc.processor.BeanInfo;
+import io.quarkus.builder.BuildException;
 import io.quarkus.deployment.Feature;
 import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
@@ -34,6 +38,7 @@
 import io.quarkus.deployment.builditem.CombinedIndexBuildItem;
 import io.quarkus.deployment.builditem.FeatureBuildItem;
 import io.quarkus.deployment.builditem.nativeimage.ReflectiveClassBuildItem;
+import io.quarkus.deployment.util.JandexUtil;
 import io.quarkus.hibernate.orm.deployment.AdditionalJpaModelBuildItem;
 import io.quarkus.hibernate.orm.deployment.HibernateEnhancersRegisteredBuildItem;
 import io.quarkus.hibernate.orm.deployment.JpaModelPersistenceUnitMappingBuildItem;
@@ -47,7 +52,8 @@
 import io.quarkus.panache.common.deployment.TypeBundle;
 
 public final class KotlinPanacheResourceProcessor {
-
+    private static final DotName DOTNAME_ID = DotName.createSimple(Id.class.getName());
+    private static final DotName DOTNAME_PANACHE_ENTITY = DotName.createSimple(PanacheEntity.class.getName());
     private static final Set<DotName> UNREMOVABLE_BEANS = singleton(createSimple(EntityManager.class.getName()));
     static final DotName TRANSIENT = DotName.createSimple(Transient.class.getName());
 
@@ -206,4 +212,21 @@ List<AdditionalJpaModelBuildItem> produceModel() {
         // only transforms classes from the application jar, so we do our own transforming
         return Collections.singletonList(new AdditionalJpaModelBuildItem(PanacheEntity.class));
     }
+
+    @BuildStep
+    ValidationPhaseBuildItem.ValidationErrorBuildItem validate(ValidationPhaseBuildItem validationPhase,
+            CombinedIndexBuildItem index) throws BuildException {
+        // we verify that no ID fields are defined (via @Id) when extending PanacheEntity
+        for (AnnotationInstance annotationInstance : index.getIndex().getAnnotations(DOTNAME_ID)) {
+            ClassInfo info = JandexUtil.getEnclosingClass(annotationInstance);
+            if (JandexUtil.isSubclassOf(index.getIndex(), info, DOTNAME_PANACHE_ENTITY)) {
+                BuildException be = new BuildException("You provide a JPA identifier via @Id inside '" + info.name() +
+                        "' but one is already provided by PanacheEntity, " +
+                        "your class should extend PanacheEntityBase instead, or use the id provided by PanacheEntity",
+                        Collections.emptyList());
+                return new ValidationPhaseBuildItem.ValidationErrorBuildItem(be);
+            }
+        }
+        return null;
+    }
 }

extensions/panache/hibernate-orm-panache-kotlin/deployment/src/test/kotlin/io/quarkus/hibernate/orm/panache/kotlin/deployment/test/DefaultPanacheEntityToStringTest.kt

@@ -0,0 +1,21 @@
+package io.quarkus.hibernate.orm.panache.kotlin.deployment.test
+
+import io.quarkus.hibernate.orm.panache.kotlin.PanacheEntity
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+
+class DefaultPanacheEntityToStringTest {
+    @Test
+    fun testDefaultToStringMethod() {
+        val myPanacheEntityWithId = MyPanacheEntity(2912L)
+        Assertions.assertEquals("MyPanacheEntity<2912>", myPanacheEntityWithId.toString())
+        val myPanacheEntityWithNullId = MyPanacheEntity(null)
+        Assertions.assertEquals("MyPanacheEntity<null>", myPanacheEntityWithNullId.toString())
+    }
+
+    internal class MyPanacheEntity(id: Long?) : PanacheEntity() {
+        init {
+            this.id = id
+        }
+    }
+}

extensions/panache/hibernate-orm-panache-kotlin/deployment/src/test/kotlin/io/quarkus/hibernate/orm/panache/kotlin/deployment/test/DuplicateIdEntity.kt

@@ -0,0 +1,9 @@
+package io.quarkus.hibernate.orm.panache.kotlin.deployment.test
+
+import io.quarkus.hibernate.orm.panache.kotlin.PanacheEntity
+import javax.persistence.Id
+
+class DuplicateIdEntity : PanacheEntity() {
+    @Id
+    var customId: String? = null
+}