diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
index 975b1dc24e0..f675c9a9c3f 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaClientCodegen.java
@@ -67,6 +67,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     public static final String SUPPORT_STREAMING = "supportStreaming";
     public static final String GRADLE_PROPERTIES= "gradleProperties";
     public static final String ERROR_OBJECT_TYPE= "errorObjectType";
+    public static final String ERROR_OBJECT_SUBTYPE= "errorObjectSubtype";
 
     public static final String PLAY_24 = "play24";
     public static final String PLAY_25 = "play25";
@@ -120,6 +121,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     protected boolean supportStreaming = false;
     protected String gradleProperties;
     protected String errorObjectType;
+    protected List<String> errorObjectSubtype;
     protected String authFolder;
     protected String serializationLibrary = null;
 
@@ -351,6 +353,11 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         }
         additionalProperties.put(ERROR_OBJECT_TYPE, errorObjectType);
 
+        if (additionalProperties.containsKey(ERROR_OBJECT_SUBTYPE)) {
+            this.setErrorObjectSubtype((List<String>)additionalProperties.get(ERROR_OBJECT_SUBTYPE));
+        }
+        additionalProperties.put(ERROR_OBJECT_SUBTYPE, errorObjectSubtype);
+
         final String invokerFolder = (sourceFolder + '/' + invokerPackage).replace(".", "/");
         final String apiFolder = (sourceFolder + '/' + apiPackage).replace(".", "/");
         final String modelsFolder = (sourceFolder + File.separator + modelPackage().replace('.', File.separatorChar)).replace('/', File.separatorChar);
@@ -1042,6 +1049,10 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         this.errorObjectType= errorObjectType;
     }
 
+    public void setErrorObjectSubtype(final List<String> errorObjectSubtype) {
+        this.errorObjectSubtype= errorObjectSubtype;
+    }
+
     /**
      * Serialization library.
      *
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson-nextgen/api_doc.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson-nextgen/api_doc.mustache
index 5a4e3969c93..616ad65a5ac 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson-nextgen/api_doc.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson-nextgen/api_doc.mustache
@@ -63,11 +63,23 @@ public class Example {
             .execute();{{/vendorExtensions.x-group-parameters}}{{#returnType}}
       System.out.println(result);{{/returnType}}
     } catch (ApiException e) {
-      System.err.println("Exception when calling {{{classname}}}#{{{operationId}}}");
-      System.err.println("Status code: " + e.getCode());
-      System.err.println("Reason: " + e.getResponseBody());
-      System.err.println("Response headers: " + e.getResponseHeaders());
-      e.printStackTrace();
+      {{=< >=}}
+      <#errorObjectSubtype>
+      <^-first>} else </-first>if (e.getErrorObject() instanceof <&.>) {
+        // do something here
+      <#-last>
+      } else {
+        // something else happened
+        System.err.println("Exception when calling {{{classname}}}#{{{operationId}}}");
+        System.err.println("Status code: " + e.getCode());
+        System.err.println("Reason: " + e.getResponseBody());
+        System.err.println("Response headers: " + e.getResponseHeaders());
+        e.printStackTrace();
+      }
+      </-last>
+      </errorObjectSubtype>
+      <={{ }}=>
+
     }
   }
 }