diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/native/anyof_model.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/native/anyof_model.mustache
index 337d83975c1..2097e183dde 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/native/anyof_model.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/native/anyof_model.mustache
@@ -237,7 +237,7 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         {{#uniqueItems}}
         if (getActualInstance() != null) {
           int i = 0;
-          for ({{items.dataType}} _item : ({{{dataType}}})getActualInstance()) {
+          for ({{{items.dataType}}} _item : ({{{dataType}}})getActualInstance()) {
             joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
                 "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
                 URLEncoder.encode(String.valueOf(_item), StandardCharsets.UTF_8).replaceAll("\\+", "%20")));
@@ -260,7 +260,7 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         {{#uniqueItems}}
         if (getActualInstance() != null) {
           int i = 0;
-          for ({{items.dataType}} _item : ({{{dataType}}})getActualInstance()) {
+          for ({{{items.dataType}}} _item : ({{{dataType}}})getActualInstance()) {
             if (_item != null) {
               joiner.add(_item.toUrlQueryString(String.format("%s{{baseName}}%s%s", prefix, suffix,
                   "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix))));
@@ -284,7 +284,7 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         {{#uniqueItems}}
         if (getActualInstance() != null) {
           int i = 0;
-          for ({{items.dataType}} _item : ({{{dataType}}})getActualInstance()) {
+          for ({{{items.dataType}}} _item : ({{{dataType}}})getActualInstance()) {
             if (_item != null) {
               joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
                   "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/native/oneof_model.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/native/oneof_model.mustache
index a1ab4573325..8000994f0e5 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/native/oneof_model.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/native/oneof_model.mustache
@@ -270,7 +270,7 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         {{#uniqueItems}}
         if (getActualInstance() != null) {
           int i = 0;
-          for ({{items.dataType}} _item : ({{{dataType}}})getActualInstance()) {
+          for ({{{items.dataType}}} _item : ({{{dataType}}})getActualInstance()) {
             joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
                 "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
                 URLEncoder.encode(String.valueOf(_item), StandardCharsets.UTF_8).replaceAll("\\+", "%20")));
@@ -293,7 +293,7 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         {{#uniqueItems}}
         if (getActualInstance() != null) {
           int i = 0;
-          for ({{items.dataType}} _item : ({{{dataType}}})getActualInstance()) {
+          for ({{{items.dataType}}} _item : ({{{dataType}}})getActualInstance()) {
             if (_item != null) {
               joiner.add(_item.toUrlQueryString(String.format("%s{{baseName}}%s%s", prefix, suffix,
                   "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix))));
@@ -317,7 +317,7 @@ public class {{classname}} extends AbstractOpenApiSchema{{#vendorExtensions.x-im
         {{#uniqueItems}}
         if (getActualInstance() != null) {
           int i = 0;
-          for ({{items.dataType}} _item : ({{{dataType}}})getActualInstance()) {
+          for ({{{items.dataType}}} _item : ({{{dataType}}})getActualInstance()) {
             if (_item != null) {
               joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
                   "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/native/pojo.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/native/pojo.mustache
index dbd74e348ca..9ee224199fa 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/native/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/native/pojo.mustache
@@ -397,7 +397,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     {{#uniqueItems}}
     if ({{getter}}() != null) {
       int i = 0;
-      for ({{items.dataType}} _item : {{getter}}()) {
+      for ({{{items.dataType}}} _item : {{getter}}()) {
         joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
             "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
             URLEncoder.encode(String.valueOf(_item), StandardCharsets.UTF_8).replaceAll("\\+", "%20")));
@@ -420,7 +420,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     {{#uniqueItems}}
     if ({{getter}}() != null) {
       int i = 0;
-      for ({{items.dataType}} _item : {{getter}}()) {
+      for ({{{items.dataType}}} _item : {{getter}}()) {
         if (_item != null) {
           joiner.add(_item.toUrlQueryString(String.format("%s{{baseName}}%s%s", prefix, suffix,
               "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix))));
@@ -444,7 +444,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     {{#uniqueItems}}
     if ({{getter}}() != null) {
       int i = 0;
-      for ({{items.dataType}} _item : {{getter}}()) {
+      for ({{{items.dataType}}} _item : {{getter}}()) {
         if (_item != null) {
           joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
               "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
diff --git a/modules/openapi-generator/src/main/resources/Java/pojo.mustache b/modules/openapi-generator/src/main/resources/Java/pojo.mustache
index 9d2db9a73f2..f429225ae63 100644
--- a/modules/openapi-generator/src/main/resources/Java/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/pojo.mustache
@@ -393,7 +393,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     {{#uniqueItems}}
     if ({{getter}}() != null) {
       int i = 0;
-      for ({{items.dataType}} _item : {{getter}}()) {
+      for ({{{items.dataType}}} _item : {{getter}}()) {
         try {
           joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,
               "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix),
@@ -426,7 +426,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     {{#uniqueItems}}
     if ({{getter}}() != null) {
       int i = 0;
-      for ({{items.dataType}} _item : {{getter}}()) {
+      for ({{{items.dataType}}} _item : {{getter}}()) {
         if (_item != null) {
           joiner.add(_item.toUrlQueryString(String.format("%s{{baseName}}%s%s", prefix, suffix,
               "".equals(suffix) ? "" : String.format("%s%d%s", containerPrefix, i, containerSuffix))));
@@ -450,7 +450,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
     {{#uniqueItems}}
     if ({{getter}}() != null) {
       int i = 0;
-      for ({{items.dataType}} _item : {{getter}}()) {
+      for ({{{items.dataType}}} _item : {{getter}}()) {
         if (_item != null) {
           try {
             joiner.add(String.format("%s{{baseName}}%s%s=%s", prefix, suffix,