feat(scala): support scala native image build

java/fury-core/src/main/java/org/apache/fury/type/ScalaTypes.java

@@ -28,41 +28,64 @@
 /** Scala types utils using reflection without dependency on scala library. */
 @SuppressWarnings({"unchecked", "rawtypes"})
 public class ScalaTypes {
-  private static final Class<?> SCALA_MAP_TYPE;
-  private static final Class<?> SCALA_SEQ_TYPE;
-  private static final Class<?> SCALA_ITERABLE_TYPE;
-  private static final Class<?> SCALA_ITERATOR_TYPE;
-  private static final java.lang.reflect.Type SCALA_ITERATOR_RETURN_TYPE;
-  private static final java.lang.reflect.Type SCALA_NEXT_RETURN_TYPE;
+  private static volatile Class<?> SCALA_MAP_TYPE;
+  private static volatile Class<?> SCALA_SEQ_TYPE;
+  private static volatile Class<?> SCALA_ITERABLE_TYPE;
+  private static volatile java.lang.reflect.Type SCALA_ITERATOR_RETURN_TYPE;
+  private static volatile java.lang.reflect.Type SCALA_NEXT_RETURN_TYPE;
 
-  static {
-    try {
-      SCALA_ITERABLE_TYPE = ReflectionUtils.loadClass("scala.collection.Iterable");
-      SCALA_ITERATOR_TYPE = ReflectionUtils.loadClass("scala.collection.Iterator");
+  public static Class<?> getScalaMapType() {
+    if (SCALA_MAP_TYPE == null) {
+      // load scala classes dynamically to make graalvm native build work
+      // see https://github.com/quarkiverse/quarkus-fury/issues/7
       SCALA_MAP_TYPE = ReflectionUtils.loadClass("scala.collection.Map");
-      SCALA_SEQ_TYPE = ReflectionUtils.loadClass("scala.collection.Seq");
-      SCALA_ITERATOR_RETURN_TYPE = SCALA_ITERABLE_TYPE.getMethod("iterator").getGenericReturnType();
-      SCALA_NEXT_RETURN_TYPE = SCALA_ITERATOR_TYPE.getMethod("next").getGenericReturnType();
-    } catch (NoSuchMethodException e) {
-      throw new RuntimeException(e);
     }
-  }
-
-  public static Class<?> getScalaMapType() {
     return SCALA_MAP_TYPE;
   }
 
   public static Class<?> getScalaSeqType() {
+    if (SCALA_SEQ_TYPE == null) {
+      SCALA_SEQ_TYPE = ReflectionUtils.loadClass("scala.collection.Seq");
+    }
     return SCALA_SEQ_TYPE;
   }
 
   public static Class<?> getScalaIterableType() {
+    if (SCALA_ITERABLE_TYPE == null) {
+      SCALA_ITERABLE_TYPE = ReflectionUtils.loadClass("scala.collection.Iterable");
+    }
     return SCALA_ITERABLE_TYPE;
   }
 
   public static TypeRef<?> getElementType(TypeRef typeRef) {
     TypeRef<?> supertype = typeRef.getSupertype(getScalaIterableType());
-    return supertype.resolveType(SCALA_ITERATOR_RETURN_TYPE).resolveType(SCALA_NEXT_RETURN_TYPE);
+    return supertype
+        .resolveType(getScalaIteratorReturnType())
+        .resolveType(getScalaNextReturnType());
+  }
+
+  private static Type getScalaIteratorReturnType() {
+    if (SCALA_ITERATOR_RETURN_TYPE == null) {
+      try {
+        SCALA_ITERATOR_RETURN_TYPE =
+            getScalaIterableType().getMethod("iterator").getGenericReturnType();
+      } catch (NoSuchMethodException e) {
+        throw new RuntimeException(e);
+      }
+    }
+    return SCALA_ITERATOR_RETURN_TYPE;
+  }
+
+  private static Type getScalaNextReturnType() {
+    if (SCALA_NEXT_RETURN_TYPE == null) {
+      Class<?> scalaIteratorType = ReflectionUtils.loadClass("scala.collection.Iterator");
+      try {
+        SCALA_NEXT_RETURN_TYPE = scalaIteratorType.getMethod("next").getGenericReturnType();
+      } catch (NoSuchMethodException e) {
+        throw new RuntimeException(e);
+      }
+    }
+    return SCALA_NEXT_RETURN_TYPE;
   }
 
   /** Returns key/value type of scala map. */

scala/src/main/resources/META-INF/native-image/org.apache.fury/fury-core/native-image.properties

@@ -0,0 +1,35 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# https://www.graalvm.org/latest/reference-manual/native-image/dynamic-features/Reflection/#unsafe-accesses :
+# The unsafe offset get on build time may be different from runtime
+Args=--initialize-at-build-time=org.apache.fury.type.ScalaTypes,\
+    org.apache.fury.type.Seq,\
+    org.apache.fury.type.Map,\
+    org.apache.fury.type.Iterable,\
+    scala.collection.Iterator,\
+    org.apache.fury.serializer.scala.ScalaDispatcher,\
+    org.apache.fury.serializer.scala.AbstractScalaCollectionSerializer,\
+    org.apache.fury.serializer.scala.AbstractScalaMapSerializer,\
+    org.apache.fury.serializer.scala.ScalaSortedMapSerializer,\
+    org.apache.fury.serializer.scala.ScalaMapSerializer,\
+    org.apache.fury.serializer.scala.ScalaSortedSetSerializer,\
+    org.apache.fury.serializer.scala.ScalaSeqSerializer,\
+    org.apache.fury.serializer.scala.ScalaCollectionSerializer,\
+    org.apache.fury.serializer.scala.RangeSerializer,\
+    org.apache.fury.serializer.scala.RangeUtils$,\
+    org.apache.fury.serializer.scala.NumericRangeSerializer