diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConfigLoader.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConfigLoader.java
index 29c0898e568..81c547a5f07 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConfigLoader.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConfigLoader.java
@@ -45,7 +45,7 @@ public class CodegenConfigLoader {
 
         // else try to load directly
         try {
-            return (CodegenConfig) Class.forName(name).newInstance();
+            return (CodegenConfig) Class.forName(name).getDeclaredConstructor().newInstance();
         } catch (Exception e) {
             throw new GeneratorNotFoundException("Can't load config class with name '".concat(name) + "'\nAvailable:\n" + availableConfigs.toString(), e);
         }
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenModelFactory.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenModelFactory.java
index 4f781ed8b7c..bd7c72d874d 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenModelFactory.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenModelFactory.java
@@ -17,6 +17,7 @@
 
 package org.openapitools.codegen;
 
+import java.lang.reflect.InvocationTargetException;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -35,7 +36,7 @@ public final class CodegenModelFactory {
             throw new IllegalArgumentException(implementation.getSimpleName() + " doesn't extend " + type.getDefaultImplementation().getSimpleName());
         }
         try {
-            implementation.newInstance();
+            implementation.getDeclaredConstructor().newInstance();
         } catch (Exception e) {
             throw new IllegalArgumentException(e);
         }
@@ -46,8 +47,8 @@ public final class CodegenModelFactory {
     public static <T> T newInstance(CodegenModelType type) {
         Class<?> classType = typeMapping.get(type);
         try {
-            return (T) (classType != null ? classType : type.getDefaultImplementation()).newInstance();
-        } catch (IllegalAccessException | InstantiationException e) {
+            return (T) (classType != null ? classType : type.getDefaultImplementation()).getDeclaredConstructor().newInstance();
+        } catch (IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
             throw new RuntimeException(e);
         }
     }