[Java][Play] Fix compilation issues when using the supportAsync option (#7864)

* fix async in java play generator

* add async operation option

* Remove the return null and replace with a return at the right place.

Co-authored-by: Jean-François Côté <jcote@stingray.com>

docs/generators/java-play-framework.md

@@ -52,6 +52,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |sortModelPropertiesByRequiredFlag|Sort model properties to place required parameters before optional parameters.| |true|
 |sortParamsByRequiredFlag|Sort method arguments to place required parameters before optional parameters.| |true|
 |sourceFolder|source folder for generated code| |/app|
+|supportAsync|Support Async operations| |false|
 |title|server title name or client service name| |openapi-java-playframework|
 |useBeanValidation|Use BeanValidation API annotations| |true|
 |useInterfaces|Makes the controllerImp implements an interface to facilitate automatic completion when updating from version x to y of your spec| |true|

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaPlayFrameworkCodegen.java

@@ -44,6 +44,7 @@ public class JavaPlayFrameworkCodegen extends AbstractJavaCodegen implements Bea
     public static final String HANDLE_EXCEPTIONS = "handleExceptions";
     public static final String WRAP_CALLS = "wrapCalls";
     public static final String USE_SWAGGER_UI = "useSwaggerUI";
+    public static final String SUPPORT_ASYNC = "supportAsync";
 
     protected String title = "openapi-java-playframework";
     protected String configPackage = "org.openapitools.configuration";
@@ -54,6 +55,7 @@ public class JavaPlayFrameworkCodegen extends AbstractJavaCodegen implements Bea
     protected boolean handleExceptions = true;
     protected boolean wrapCalls = true;
     protected boolean useSwaggerUI = true;
+    protected boolean supportAsync = false;
 
     public JavaPlayFrameworkCodegen() {
         super();
@@ -94,6 +96,7 @@ public class JavaPlayFrameworkCodegen extends AbstractJavaCodegen implements Bea
         cliOptions.add(createBooleanCliWithDefault(HANDLE_EXCEPTIONS, "Add a 'throw exception' to each controller function. Add also a custom error handler where you can put your custom logic", handleExceptions));
         cliOptions.add(createBooleanCliWithDefault(WRAP_CALLS, "Add a wrapper to each controller function to handle things like metrics, response modification, etc..", wrapCalls));
         cliOptions.add(createBooleanCliWithDefault(USE_SWAGGER_UI, "Add a route to /api which show your documentation in swagger-ui. Will also import needed dependencies", useSwaggerUI));
+        cliOptions.add(createBooleanCliWithDefault(SUPPORT_ASYNC, "Support Async operations", supportAsync));
     }
 
     @Override
@@ -167,6 +170,11 @@ public class JavaPlayFrameworkCodegen extends AbstractJavaCodegen implements Bea
         }
         writePropertyBack(USE_SWAGGER_UI, useSwaggerUI);
 
+        if (additionalProperties.containsKey(SUPPORT_ASYNC)) {
+            this.setSupportAsync(convertPropertyToBoolean(SUPPORT_ASYNC));
+        }
+        writePropertyBack(SUPPORT_ASYNC, supportAsync);
+
         //We don't use annotation anymore
         importMapping.remove("ApiModelProperty");
         importMapping.remove("ApiModel");
@@ -287,6 +295,10 @@ public class JavaPlayFrameworkCodegen extends AbstractJavaCodegen implements Bea
         this.useSwaggerUI = useSwaggerUI;
     }
 
+    public void setSupportAsync(boolean supportAsync) {
+        this.supportAsync = supportAsync;
+    }
+
     @Override
     public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> objs, List<Object> allModels) {
         Map<String, Object> operations = (Map<String, Object>) objs.get("operations");

modules/openapi-generator/src/main/resources/JavaPlayFramework/newApiInterface.mustache

@@ -17,6 +17,7 @@ import openapitools.OpenAPIUtils;
 import static play.mvc.Results.ok;
 import play.api.libs.Files.TemporaryFile;
 {{#supportAsync}}
+import java.util.concurrent.CompletionException;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.CompletableFuture;
 {{/supportAsync}}

modules/openapi-generator/src/main/resources/JavaPlayFramework/responseToResult.mustache

@@ -1,7 +1,8 @@
 {{^controllerOnly}}
 {{^returnType}}
 {{#supportAsync}}
-return CompletableFuture.supplyAsync(() -> {
+CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
 {{/supportAsync}}
 {{/returnType}}
 {{#returnType}}{{#supportAsync}}CompletionStage<{{>returnTypesNoVoid}}> stage = {{/supportAsync}}{{^supportAsync}}{{>returnTypesNoVoid}} obj = {{/supportAsync}}{{/returnType}}{{^returnType}}{{#supportAsync}}    {{/supportAsync}}{{/returnType}}{{^useInterfaces}}imp.{{/useInterfaces}}{{operationId}}(request{{#hasParams}}, {{/hasParams}}{{#allParams}}{{paramName}}{{^-last}}, {{/-last}}{{/allParams}}){{#returnType}}{{#supportAsync}}.thenApply(obj -> { {{/supportAsync}}{{/returnType}}{{^supportAsync}};{{/supportAsync}}{{#supportAsync}}{{^returnType}};{{/returnType}}{{/supportAsync}}
@@ -53,7 +54,7 @@ return CompletableFuture.supplyAsync(() -> {
 {{/returnType}}
 {{#returnType}}
 {{#supportAsync}}
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
 {{/supportAsync}}
 {{^isResponseFile}}
 {{#supportAsync}}    {{/supportAsync}}JsonNode result = mapper.valueToTree(obj);
@@ -64,11 +65,23 @@ stage.thenApply(obj -> {
 {{/isResponseFile}}
 {{/returnType}}
 {{^returnType}}
-{{#supportAsync}}    {{/supportAsync}}return ok();
+{{#supportAsync}}
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
+        return ok();
+    });
+    return result;
+{{/supportAsync}}
+{{^supportAsync}}
+return ok();
+{{/supportAsync}}
 {{/returnType}}
+{{#returnType}}
 {{#supportAsync}}
 });
 {{/supportAsync}}
+{{/returnType}}
 {{/controllerOnly}}
 {{#controllerOnly}}
 return ok();

samples/server/petstore/java-play-framework-async/app/controllers/PetApiControllerImpInterface.java

@@ -17,6 +17,7 @@ import com.fasterxml.jackson.databind.JsonNode;
 import openapitools.OpenAPIUtils;
 import static play.mvc.Results.ok;
 import play.api.libs.Files.TemporaryFile;
+import java.util.concurrent.CompletionException;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.CompletableFuture;
 
@@ -28,20 +29,30 @@ public abstract class PetApiControllerImpInterface {
     private ObjectMapper mapper = new ObjectMapper();
 
     public CompletionStage<Result> addPetHttp(Http.Request request, Pet body) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     addPet(request, body);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
     public abstract void addPet(Http.Request request, Pet body) throws Exception;
 
     public CompletionStage<Result> deletePetHttp(Http.Request request, Long petId, String apiKey) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     deletePet(request, petId, apiKey);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
@@ -56,7 +67,7 @@ public abstract class PetApiControllerImpInterface {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -74,7 +85,7 @@ stage.thenApply(obj -> {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -90,7 +101,7 @@ stage.thenApply(obj -> {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -100,20 +111,30 @@ stage.thenApply(obj -> {
     public abstract CompletionStage<Pet> getPetById(Http.Request request, Long petId) throws Exception;
 
     public CompletionStage<Result> updatePetHttp(Http.Request request, Pet body) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     updatePet(request, body);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
     public abstract void updatePet(Http.Request request, Pet body) throws Exception;
 
     public CompletionStage<Result> updatePetWithFormHttp(Http.Request request, Long petId, String name, String status) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     updatePetWithForm(request, petId, name, status);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
@@ -126,7 +147,7 @@ stage.thenApply(obj -> {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });

samples/server/petstore/java-play-framework-async/app/controllers/StoreApiControllerImpInterface.java

@@ -16,6 +16,7 @@ import com.fasterxml.jackson.databind.JsonNode;
 import openapitools.OpenAPIUtils;
 import static play.mvc.Results.ok;
 import play.api.libs.Files.TemporaryFile;
+import java.util.concurrent.CompletionException;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.CompletableFuture;
 
@@ -27,10 +28,15 @@ public abstract class StoreApiControllerImpInterface {
     private ObjectMapper mapper = new ObjectMapper();
 
     public CompletionStage<Result> deleteOrderHttp(Http.Request request, String orderId) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     deleteOrder(request, orderId);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
@@ -40,7 +46,7 @@ public abstract class StoreApiControllerImpInterface {
         CompletionStage<Map<String, Integer>> stage = getInventory(request).thenApply(obj -> { 
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -56,7 +62,7 @@ stage.thenApply(obj -> {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -72,7 +78,7 @@ stage.thenApply(obj -> {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });

samples/server/petstore/java-play-framework-async/app/controllers/UserApiControllerImpInterface.java

@@ -16,6 +16,7 @@ import com.fasterxml.jackson.databind.JsonNode;
 import openapitools.OpenAPIUtils;
 import static play.mvc.Results.ok;
 import play.api.libs.Files.TemporaryFile;
+import java.util.concurrent.CompletionException;
 import java.util.concurrent.CompletionStage;
 import java.util.concurrent.CompletableFuture;
 
@@ -27,40 +28,60 @@ public abstract class UserApiControllerImpInterface {
     private ObjectMapper mapper = new ObjectMapper();
 
     public CompletionStage<Result> createUserHttp(Http.Request request, User body) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     createUser(request, body);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
     public abstract void createUser(Http.Request request, User body) throws Exception;
 
     public CompletionStage<Result> createUsersWithArrayInputHttp(Http.Request request, List<User> body) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     createUsersWithArrayInput(request, body);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
     public abstract void createUsersWithArrayInput(Http.Request request, List<User> body) throws Exception;
 
     public CompletionStage<Result> createUsersWithListInputHttp(Http.Request request, List<User> body) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     createUsersWithListInput(request, body);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
     public abstract void createUsersWithListInput(Http.Request request, List<User> body) throws Exception;
 
     public CompletionStage<Result> deleteUserHttp(Http.Request request, String username) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     deleteUser(request, username);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
@@ -73,7 +94,7 @@ public abstract class UserApiControllerImpInterface {
     }
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -86,7 +107,7 @@ stage.thenApply(obj -> {
         CompletionStage<String> stage = loginUser(request, username, password).thenApply(obj -> { 
     return obj;
 });
-stage.thenApply(obj -> {
+return stage.thenApply(obj -> {
     JsonNode result = mapper.valueToTree(obj);
     return ok(result);
 });
@@ -96,20 +117,30 @@ stage.thenApply(obj -> {
     public abstract CompletionStage<String> loginUser(Http.Request request, @NotNull String username, @NotNull String password) throws Exception;
 
     public CompletionStage<Result> logoutUserHttp(Http.Request request) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     logoutUser(request);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }
 
     public abstract void logoutUser(Http.Request request) throws Exception;
 
     public CompletionStage<Result> updateUserHttp(Http.Request request, String username, User body) throws Exception {
-        return CompletableFuture.supplyAsync(() -> {
+        CompletableFuture<Result> result = CompletableFuture.supplyAsync(() -> {
+        try {
     updateUser(request, username, body);
+        } catch (Exception e) {
+            throw new CompletionException(e);
+        }
         return ok();
     });
+    return result;
 
     }