diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/rest-assured/api.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/rest-assured/api.mustache
index 8ccff676f1a..f865f095640 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/rest-assured/api.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/rest-assured/api.mustache
@@ -155,9 +155,9 @@ public class {{classname}} {
             this.reqSpec = reqSpec;
             {{#vendorExtensions}}
             {{#x-content-type}}
-            reqSpec.setContentType("{{x-content-type}}");
+            reqSpec.setContentType("{{{x-content-type}}}");
             {{/x-content-type}}
-            reqSpec.setAccept("{{#x-accepts}}{{.}}{{^-last}},{{/-last}}{{/x-accepts}}");
+            reqSpec.setAccept("{{#x-accepts}}{{{.}}}{{^-last}},{{/-last}}{{/x-accepts}}");
             {{/vendorExtensions}}
             this.respSpec = new ResponseSpecBuilder();
         }
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache
index d6609ff960c..ca566b626bd 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/api.mustache
@@ -233,7 +233,7 @@ public interface {{classname}} {
     @RequestMapping(
         method = RequestMethod.{{httpMethod}},
         value = "{{{path}}}"{{#singleContentTypes}}{{#hasProduces}},
-        produces = { {{#vendorExtensions.x-accepts}}"{{.}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}} }{{/hasProduces}}{{#hasConsumes}},
+        produces = { {{#vendorExtensions.x-accepts}}"{{{.}}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}} }{{/hasProduces}}{{#hasConsumes}},
         consumes = "{{{vendorExtensions.x-content-type}}}"{{/hasConsumes}}{{/singleContentTypes}}{{^singleContentTypes}}{{#hasProduces}},
         produces = { {{#produces}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/produces}} }{{/hasProduces}}{{#hasConsumes}},
         consumes = { {{#consumes}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/consumes}} }{{/hasConsumes}}{{/singleContentTypes}}{{#hasVersionHeaders}},
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/api.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/api.mustache
index a0808e35bf1..da85695b028 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/api.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-http-interface/api.mustache
@@ -54,7 +54,7 @@ public interface {{classname}} {
     @HttpExchange(
         method = "{{{httpMethod}}}",
         value = "{{{path}}}",
-        accept = { {{#vendorExtensions.x-accepts}}"{{.}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}} }{{#vendorExtensions.x-content-type}},
+        accept = { {{#vendorExtensions.x-accepts}}"{{{.}}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}} }{{#vendorExtensions.x-content-type}},
         contentType = "{{{vendorExtensions.x-content-type}}}"{{/vendorExtensions.x-content-type}}
     )
     {{>responseType}} {{operationId}}(
diff --git a/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.groovy.mustache b/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.groovy.mustache
index de981e9639d..04da306a8cf 100644
--- a/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.groovy.mustache
+++ b/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.groovy.mustache
@@ -139,10 +139,10 @@ class {{classname}}Spec extends Specification {
         MutableHttpRequest request = HttpRequest.{{httpMethod}}{{#vendorExtensions.methodAllowsBody}}{{#bodyParam}}(uri, body){{/bodyParam}}{{#isMultipart}}{{^formParams}}(uri, body){{/formParams}}{{/isMultipart}}{{#formParams.0}}(uri, form){{/formParams.0}}{{^bodyParam}}{{^isMultipart}}{{^formParams}}(uri, null){{/formParams}}{{/isMultipart}}{{/bodyParam}}{{/vendorExtensions.methodAllowsBody}}{{^vendorExtensions.methodAllowsBody}}(uri){{/vendorExtensions.methodAllowsBody}}
         {{!Fill in all the request parameters}}
         {{#vendorExtensions.x-content-type}}
-            .contentType('{{vendorExtensions.x-content-type}}')
+            .contentType('{{{vendorExtensions.x-content-type}}}')
         {{/vendorExtensions.x-content-type}}
         {{#vendorExtensions.x-accepts}}
-            .accept('{{vendorExtensions.x-accepts}}')
+            .accept('{{{vendorExtensions.x-accepts}}}')
         {{/vendorExtensions.x-accepts}}
         {{#headerParams}}
             .header('{{{baseName}}}', {{{vendorExtensions.groovyExample}}}{{^isString}}.toString(){{/isString}})
diff --git a/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.mustache b/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.mustache
index 75cb7bd30b8..6e7fe03a61c 100644
--- a/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.mustache
+++ b/modules/openapi-generator/src/main/resources/java-micronaut/server/test/controller_test.mustache
@@ -146,8 +146,8 @@ public class {{classname}}Test {
         {{closebrace}}{{closebrace}}{{/pathParams.0}});
         {{!Create the request with body and uri}}
         MutableHttpRequest<?> request = HttpRequest.{{httpMethod}}{{#vendorExtensions.methodAllowsBody}}{{#bodyParam}}(uri, body){{/bodyParam}}{{#isMultipart}}{{^formParams}}(uri, body){{/formParams}}{{/isMultipart}}{{#formParams.0}}(uri, form){{/formParams.0}}{{^bodyParam}}{{^isMultipart}}{{^formParams}}(uri, null){{/formParams}}{{/isMultipart}}{{/bodyParam}}{{/vendorExtensions.methodAllowsBody}}{{^vendorExtensions.methodAllowsBody}}(uri){{/vendorExtensions.methodAllowsBody}}{{!Fill in all the request parameters}}{{#vendorExtensions.x-contentType}}
-            .contentType("{{vendorExtensions.x-contentType}}"){{/vendorExtensions.x-contentType}}{{#vendorExtensions.x-accepts}}
-            .accept("{{vendorExtensions.x-accepts}}"){{/vendorExtensions.x-accepts}}{{#headerParams}}
+            .contentType("{{{vendorExtensions.x-contentType}}}"){{/vendorExtensions.x-contentType}}{{#vendorExtensions.x-accepts}}
+            .accept("{{{vendorExtensions.x-accepts}}}"){{/vendorExtensions.x-accepts}}{{#headerParams}}
             .header("{{{baseName}}}", {{^isString}}String.valueOf({{/isString}}{{{example}}}{{^isString}}){{/isString}}){{/headerParams}}{{#cookieParams}}
             .cookie(Cookie.of("{{{baseName}}}", {{{example}}})){{/cookieParams}};
         {{!Fill in the query parameters}}
diff --git a/modules/openapi-generator/src/main/resources/java-pkmst/api.mustache b/modules/openapi-generator/src/main/resources/java-pkmst/api.mustache
index 8da721448f5..f24464e8b3d 100644
--- a/modules/openapi-generator/src/main/resources/java-pkmst/api.mustache
+++ b/modules/openapi-generator/src/main/resources/java-pkmst/api.mustache
@@ -58,7 +58,7 @@ public interface {{classname}} {
     @RequestMapping(
         method = RequestMethod.{{httpMethod}},
         value = "{{{path}}}"{{#singleContentTypes}},
-        produces = { {{#vendorExtensions.x-accepts}}"{{.}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}} },
+        produces = { {{#vendorExtensions.x-accepts}}"{{{.}}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}} },
         consumes = "{{{vendorExtensions.x-content-type}}}"{{/singleContentTypes}}{{^singleContentTypes}}{{#hasProduces}},
         produces = { {{#produces}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/produces}} }{{/hasProduces}}{{#hasConsumes}},
         consumes = { {{#consumes}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/consumes}} }{{/hasConsumes}}{{/singleContentTypes}}
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/api.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/api.mustache
index 6220601fe64..9257b1b52f7 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/api.mustache
@@ -84,7 +84,7 @@ class {{classname}}Controller({{#serviceInterface}}@Autowired(required = true) v
     @RequestMapping(
         method = [RequestMethod.{{httpMethod}}],
         value = ["{{#lambdaEscapeInNormalString}}{{path}}{{/lambdaEscapeInNormalString}}"]{{#singleContentTypes}}{{#hasProduces}},
-        produces = [{{#vendorExtensions.x-accepts}}"{{.}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}}]{{/hasProduces}}{{#hasConsumes}},
+        produces = [{{#vendorExtensions.x-accepts}}"{{{.}}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}}]{{/hasProduces}}{{#hasConsumes}},
         consumes = "{{{vendorExtensions.x-content-type}}}"{{/hasConsumes}}{{/singleContentTypes}}{{^singleContentTypes}}{{#hasProduces}},
         produces = [{{#produces}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/produces}}]{{/hasProduces}}{{#hasConsumes}},
         consumes = [{{#consumes}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/consumes}}]{{/hasConsumes}}{{/singleContentTypes}}
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/apiInterface.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/apiInterface.mustache
index 8c436c764db..fd6d88119c9 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/apiInterface.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/apiInterface.mustache
@@ -97,7 +97,7 @@ interface {{classname}} {
     @RequestMapping(
             method = [RequestMethod.{{httpMethod}}],
             value = ["{{#lambdaEscapeInNormalString}}{{path}}{{/lambdaEscapeInNormalString}}"]{{#singleContentTypes}}{{#hasProduces}},
-            produces = [{{#vendorExtensions.x-accepts}}"{{.}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}}]{{/hasProduces}}{{#hasConsumes}},
+            produces = [{{#vendorExtensions.x-accepts}}"{{{.}}}"{{^-last}}, {{/-last}}{{/vendorExtensions.x-accepts}}]{{/hasProduces}}{{#hasConsumes}},
             consumes = "{{{vendorExtensions.x-content-type}}}"{{/hasConsumes}}{{/singleContentTypes}}{{^singleContentTypes}}{{#hasProduces}},
             produces = [{{#produces}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/produces}}]{{/hasProduces}}{{#hasConsumes}},
             consumes = [{{#consumes}}"{{{mediaType}}}"{{^-last}}, {{/-last}}{{/consumes}}]{{/hasConsumes}}{{/singleContentTypes}}