Make supported naming strategies available at runtime for native image

data-model/src/main/java/io/micronaut/data/model/AbstractPersistentEntity.java

@@ -19,9 +19,13 @@
 import io.micronaut.core.annotation.Nullable;
 import io.micronaut.core.annotation.AnnotationMetadata;
 import io.micronaut.core.annotation.AnnotationMetadataProvider;
+import io.micronaut.core.beans.BeanIntrospection;
+import io.micronaut.core.reflect.ClassUtils;
 import io.micronaut.core.reflect.InstantiationUtils;
 import io.micronaut.data.annotation.MappedEntity;
 import io.micronaut.data.model.naming.NamingStrategy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.util.Map;
 import java.util.Optional;
@@ -35,6 +39,8 @@
  */
 public abstract class AbstractPersistentEntity implements PersistentEntity {
 
+    private static final Logger LOG = LoggerFactory.getLogger(AbstractPersistentEntity.class);
+
     private static final Map<String, NamingStrategy> NAMING_STRATEGIES = new ConcurrentHashMap<>(3);
 
     private final AnnotationMetadataProvider annotationMetadataProvider;
@@ -70,6 +76,21 @@ private static Optional<NamingStrategy> getNamingStrategy(String className, Clas
         if (namingStrategy != null) {
             return Optional.of(namingStrategy);
         } else {
+            try {
+                Class<?> namingStrategyClass = ClassUtils.forName(className, classLoader).orElse(null);
+                if (namingStrategyClass != null) {
+                    BeanIntrospection<?> beanIntrospection = BeanIntrospection.getIntrospection(namingStrategyClass);
+                    Object o = beanIntrospection.instantiate();
+                    if (o instanceof NamingStrategy ns) {
+                        NAMING_STRATEGIES.put(className, ns);
+                        return Optional.of(ns);
+                    }
+                }
+            } catch (Exception e) {
+                if (LOG.isDebugEnabled()) {
+                    LOG.debug("Tried, but could not instantiate naming strategy: {}", className, e);
+                }
+            }
             Object o = InstantiationUtils.tryInstantiate(className, classLoader).orElse(null);
             if (o instanceof NamingStrategy ns) {
                 NAMING_STRATEGIES.put(className, ns);

data-model/src/main/java/io/micronaut/data/model/naming/NamingStrategies.java

@@ -16,6 +16,7 @@
 package io.micronaut.data.model.naming;
 
 import io.micronaut.core.annotation.NonNull;
+import io.micronaut.core.annotation.TypeHint;
 import io.micronaut.core.naming.NameUtils;
 
 import java.util.Locale;
@@ -30,6 +31,7 @@ public class NamingStrategies {
     /**
      * Example: FOO_BAR.
      */
+    @TypeHint(UnderScoreSeparatedUpperCase.class)
     public static class UnderScoreSeparatedUpperCase implements NamingStrategy {
         @NonNull
         @Override
@@ -40,6 +42,7 @@ public String mappedName(@NonNull String name) {
     /**
      * Example: foo_bar.
      */
+    @TypeHint(UnderScoreSeparatedLowerCase.class)
     public static class UnderScoreSeparatedLowerCase implements NamingStrategy {
         @NonNull
         @Override
@@ -50,6 +53,7 @@ public String mappedName(@NonNull String name) {
     /**
      * Example: foo-bar.
      */
+    @TypeHint(KebabCase.class)
     public static class KebabCase implements NamingStrategy {
         @NonNull
         @Override
@@ -60,6 +64,7 @@ public String mappedName(@NonNull String name) {
     /**
      * Example: foobar.
      */
+    @TypeHint(LowerCase.class)
     public static class LowerCase implements NamingStrategy {
         @NonNull
         @Override
@@ -70,6 +75,7 @@ public String mappedName(@NonNull String name) {
     /**
      * Example: foobar.
      */
+    @TypeHint(UpperCase.class)
     public static class UpperCase implements NamingStrategy {
         @NonNull
         @Override
@@ -80,6 +86,7 @@ public String mappedName(@NonNull String name) {
     /**
      * No naming conversion.
      */
+    @TypeHint(Raw.class)
     public static class Raw implements NamingStrategy {
         @NonNull
         @Override

doc-examples/jdbc-example-java/src/main/java/example/User.java

@@ -2,18 +2,19 @@
 package example;
 
 import io.micronaut.data.annotation.*;
+import io.micronaut.data.model.naming.NamingStrategies;
 
-@MappedEntity
-@Where("@.enabled = true") // <1>
+@MappedEntity(namingStrategy = NamingStrategies.Raw.class)
+@Where("@.userEnabled = true") // <1>
 public class User {
     @GeneratedValue
     @Id
     private Long id;
-    private String name;
-    private boolean enabled = true; // <2>
+    private String userName;
+    private boolean userEnabled = true; // <2>
 
-    public User(String name) {
-        this.name = name;
+    public User(String userName) {
+        this.userName = userName;
     }
 
     public Long getId() {
@@ -24,19 +25,19 @@ public void setId(Long id) {
         this.id = id;
     }
 
-    public String getName() {
-        return name;
+    public String getUserName() {
+        return userName;
     }
 
-    public void setName(String name) {
-        this.name = name;
+    public void setUserName(String userName) {
+        this.userName = userName;
     }
 
-    public boolean isEnabled() {
-        return enabled;
+    public boolean isUserEnabled() {
+        return userEnabled;
     }
 
-    public void setEnabled(boolean enabled) {
-        this.enabled = enabled;
+    public void setUserEnabled(boolean userEnabled) {
+        this.userEnabled = userEnabled;
     }
 }

doc-examples/jdbc-example-java/src/main/java/example/UserRepository.java

@@ -13,9 +13,9 @@
 public interface UserRepository extends CrudRepository<User, Long> { // <1>
 
     @Override
-    @Query("UPDATE user SET enabled = false WHERE id = :id") // <2>
+    @Query("UPDATE user SET userEnabled = false WHERE id = :id") // <2>
     void deleteById(@NonNull @NotNull Long id);
 
-    @Query("SELECT * FROM user WHERE enabled = false") // <3>
+    @Query("SELECT * FROM user WHERE userEnabled = false") // <3>
     List<User> findDisabled();
 }

doc-examples/jdbc-example-java/src/test/java/example/UserRepositorySpec.java

@@ -32,6 +32,6 @@ void testSoftDelete() {
 
         final List<User> disabled = userRepository.findDisabled();
         assertEquals(1, disabled.size());
-        assertEquals("Joe", disabled.iterator().next().getName());
+        assertEquals("Joe", disabled.iterator().next().getUserName());
     }
 }

src/main/docs/guide/dbc/sqlMapping/sqlNaming.adoc

@@ -12,6 +12,8 @@ include::data-tck/src/main/java/io/micronaut/data/tck/entities/CountryRegion.jav
 
 Few important things to note. Since Micronaut Data pre-computes the table and column name mappings at compilation time the specified api:data.model.naming.NamingStrategy[] implementation must be on the annotation processor classpath (`annotationProcessor` scope for Java or `kapt` for Kotlin).
 
+If running project in native image, custom naming strategy needs to have `io.micronaut.core.annotation.TypeHint(CustomNamingStrategy.class)` annotation where custom naming strategy class is `CustomNamingStrategy`.
+
 In addition if you don't want to repeat the above annotation definition on every entity it is handy to define a meta-annotation where the above annotation definition is applied to another annotation that you add to your class.
 
 ==== Escaping Table/Column Name Identifiers