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Posted to notifications@dubbo.apache.org by "natsumm (via GitHub)" <gi...@apache.org> on 2023/02/02 02:32:58 UTC

[GitHub] [dubbo] natsumm opened a new issue, #11442: provider泛型类型为Float时返回Double类型

natsumm opened a new issue, #11442:
URL: https://github.com/apache/dubbo/issues/11442

   <!-- If you need to report a security issue please visit https://github.com/apache/dubbo/security/policy -->
   
   - [X] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
   
   ### Environment
   
   * Dubbo version: 3.0.7
   * Operating System version: Linux Ubuntu-20.04
   * Java version: 1.8
   
   ### Steps to reproduce this issue
   
   1. provider返回泛型为Float
   2. consumer以Float接收返回参数
   
   Demo地址: https://github.com/natsumm/dubbo-generic-float-issue
   
   ### Expected Behavior
   
   <!-- What do you expect from the above steps？-->
   返回Float类型参数
   
   ### Actual Behavior
   
   <!-- What actually happens? -->
   返回了Double类型参数，并抛出java.lang.ClassCastException
   
   ### Detail
   
   1. provider端代码
   ```
   @DubboService
   public class DemoServiceImpl implements DemoService {
   
       @Override
       public String sayHello(String name) {
           return "Hello " + name;
       }
   
       //此处定义为Float类型
       @Override
       public List<Float> getFloats() {
           List<Float> floats = new ArrayList<>();
           floats.add(35.3F);
           floats.add(45.1F);
           return floats;
       }
   }
   ```
   2. consumer端代码
   ```
   @SpringBootApplication
   @Service
   @EnableDubbo
   public class ConsumerApplication {
   
       @DubboReference
       private DemoService demoService;
   
       public static void main(String[] args) {
   
           ConfigurableApplicationContext context = SpringApplication.run(ConsumerApplication.class, args);
           ConsumerApplication application = context.getBean(ConsumerApplication.class);
           String result = application.doSayHello("world");
           System.out.println("result: " + result);
   
           //此处返回了Double类型
           List<Float> floats = application.getFloats();
           System.out.println("floats = " + floats);
           Float aFloat = floats.get(0);
       }
   
       public String doSayHello(String name) {
           return demoService.sayHello(name);
       }
   
       public List<Float> getFloats() {
           return demoService.getFloats();
       }
   }
   ```
   3. 预期返回Float类型实际Double
   ![image](https://user-images.githubusercontent.com/75228668/216214559-64b8b85a-c0c9-4d79-9b26-e37e938696aa.png)
   
   


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