DATACMNS-1767 - Disable ClassGeneratingEntityInstantiator when running native-image.

Always fall back to reflection when the system property for org.graalvm.nativeimage.imagecode is set.
This is required because on the fly code generation is not supported in this case.

Original pull request: #456.

Author: christophstrobl

src/main/java/org/springframework/data/mapping/model/ClassGeneratingEntityInstantiator.java

@@ -24,6 +24,8 @@
 import java.util.List;
 import java.util.Map;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.springframework.asm.ClassWriter;
 import org.springframework.asm.MethodVisitor;
 import org.springframework.asm.Opcodes;
@@ -52,6 +54,9 @@
  */
 class ClassGeneratingEntityInstantiator implements EntityInstantiator {
 
+	private static final Log LOGGER = LogFactory.getLog(ClassGeneratingEntityInstantiator.class);
+	private static final boolean IN_NATIVE_IMAGE = System.getProperty("org.graalvm.nativeimage.imagecode") != null;
+
 	private static final Object[] EMPTY_ARGS = new Object[0];
 
 	private final ObjectInstantiatorClassGenerator generator;
@@ -137,6 +142,15 @@ protected EntityInstantiator doCreateEntityInstantiator(PersistentEntity<?, ?> e
 	 */
 	boolean shouldUseReflectionEntityInstantiator(PersistentEntity<?, ?> entity) {
 
+		if(IN_NATIVE_IMAGE) {
+
+			if(LOGGER.isDebugEnabled()) {
+				LOGGER.debug(String.format("graalvm.nativeimage - fall back to reflection for %s.", entity.getName()));
+			}
+
+			return true;
+		}
+
 		Class<?> type = entity.getType();
 
 		if (type.isInterface() //