diff --git a/bin/configs/java-microprofile-rest-client.yaml b/bin/configs/java-microprofile-rest-client.yaml
index 2d9796db540..384a6aa7f30 100644
--- a/bin/configs/java-microprofile-rest-client.yaml
+++ b/bin/configs/java-microprofile-rest-client.yaml
@@ -5,3 +5,4 @@ inputSpec: modules/openapi-generator/src/test/resources/2_0/petstore.yaml
 templateDir: modules/openapi-generator/src/main/resources/Java
 additionalProperties:
   artifactId: microprofile-rest-client
+  configKey: petstore
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 328a4b089b2..1d8b4f18ba2 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
@@ -56,6 +56,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     public static final String USE_PLAY_WS = "usePlayWS";
     public static final String PLAY_VERSION = "playVersion";
     public static final String ASYNC_NATIVE = "asyncNative";
+    public static final String CONFIGKEY = "configKey";
     public static final String PARCELABLE_MODEL = "parcelableModel";
     public static final String USE_RUNTIME_EXCEPTION = "useRuntimeException";
     public static final String USE_REFLECTION_EQUALS_HASHCODE = "useReflectionEqualsHashCode";
@@ -102,6 +103,7 @@ public class JavaClientCodegen extends AbstractJavaCodegen
     protected boolean usePlayWS = false;
     protected String playVersion = PLAY_26;
     protected String microprofileFramework = MICROPROFILE_DEFAULT;
+    protected String configKey = null;
 
     protected boolean asyncNative = false;
     protected boolean parcelableModel = false;
@@ -281,6 +283,10 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         }
         additionalProperties.put(MICROPROFILE_FRAMEWORK, microprofileFramework);
 
+        if (additionalProperties.containsKey(CONFIGKEY)) {
+            this.setConfigKey(additionalProperties.get(CONFIGKEY).toString());
+        }
+
         if (additionalProperties.containsKey(ASYNC_NATIVE)) {
             this.setAsyncNative(convertPropertyToBooleanAndWriteBack(ASYNC_NATIVE));
         }
@@ -964,6 +970,10 @@ public class JavaClientCodegen extends AbstractJavaCodegen
         this.microprofileFramework = microprofileFramework;
     }
 
+    public void setConfigKey(String configKey) {
+        this.configKey = configKey;
+    }
+
     public void setParcelableModel(boolean parcelableModel) {
         this.parcelableModel = parcelableModel;
     }
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/microprofile/api.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/microprofile/api.mustache
index f6a69ff6a7c..119494e54d3 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/microprofile/api.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/microprofile/api.mustache
@@ -30,7 +30,7 @@ import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
  */
 {{/appName}}
 
-@RegisterRestClient
+@RegisterRestClient{{#configKey}}(configKey="{{configKey}}"){{/configKey}}
 @RegisterProvider(ApiExceptionMapper.class)
 @Path("{{#useAnnotatedBasePath}}{{contextPath}}{{/useAnnotatedBasePath}}{{commonPath}}")
 public interface {{classname}}  {
diff --git a/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/PetApi.java b/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/PetApi.java
index 01f075d1cc0..3d2ecd955a5 100644
--- a/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/PetApi.java
+++ b/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/PetApi.java
@@ -36,7 +36,7 @@ import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
  *
  */
 
-@RegisterRestClient
+@RegisterRestClient(configKey="petstore")
 @RegisterProvider(ApiExceptionMapper.class)
 @Path("/pet")
 public interface PetApi  {
diff --git a/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/StoreApi.java b/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/StoreApi.java
index 4e5844e79ad..fc5b9b52f29 100644
--- a/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/StoreApi.java
+++ b/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/StoreApi.java
@@ -34,7 +34,7 @@ import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
  *
  */
 
-@RegisterRestClient
+@RegisterRestClient(configKey="petstore")
 @RegisterProvider(ApiExceptionMapper.class)
 @Path("/store")
 public interface StoreApi  {
diff --git a/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/UserApi.java b/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/UserApi.java
index 41c31a4d49d..b9fd9ed12a0 100644
--- a/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/UserApi.java
+++ b/samples/client/petstore/java/microprofile-rest-client/src/main/java/org/openapitools/client/api/UserApi.java
@@ -34,7 +34,7 @@ import org.eclipse.microprofile.rest.client.inject.RegisterRestClient;
  *
  */
 
-@RegisterRestClient
+@RegisterRestClient(configKey="petstore")
 @RegisterProvider(ApiExceptionMapper.class)
 @Path("/user")
 public interface UserApi  {