[英]How to pass checked exception from CompletableFuture to ControllerAdvice
如何让 controllerAdvice 类捕获从 completablefutrue 抛出的异常。 在下面的代码中,我有一个方法checkId
会抛出一个已检查的异常。 我使用 completablefuture 调用此方法并将已检查的异常包装在 CompletionException 中。 虽然我在控制器通知类中有一个处理程序方法,但它没有处理错误。
package com.example.demo.controller;
@RestController
public class HomeController {
@GetMapping(path = "/check")
public CompletableFuture<String> check(@RequestParam("id") int id) {
return CompletableFuture.supplyAsync(() -> {
try {
return checkId(id);
}
catch (Exception e) {
throw new CompletionException(e);
}
});
}
public String checkId(int id) throws Exception {
if (id < 0) {
throw new MyException("Id must be greater than 0");
}
return "id is good";
}
}
——
package com.example.demo;
public class MyException extends Exception {
public MyException(String message) {
super(message);
}
}
——
package com.example.demo;
@ControllerAdvice
public class ExceptionResolver {
@ExceptionHandler(value = CompletionException.class)
public String handleCompletionException(CompletionException ex) {
return ex.getMessage();
}
}
——
package com.example.demo;
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
堆栈跟踪:
com.example.demo.MyException: Id must be greater than 0
at com.example.demo.controller.HomeController.checkId(HomeController.java:30) ~[classes/:na]
at com.example.demo.controller.HomeController.lambda$0(HomeController.java:19) ~[classes/:na]
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1692) ~[na:na]
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) ~[na:na]
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177) ~[na:na]
2020-01-24 14:38:30.489 ERROR 938 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.example.demo.MyException: Id must be greater than 0] with root cause
com.example.demo.MyException: Id must be greater than 0
at com.example.demo.controller.HomeController.checkId(HomeController.java:30) ~[classes/:na]
at com.example.demo.controller.HomeController.lambda$0(HomeController.java:19) ~[classes/:na]
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700) ~[na:na]
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1692) ~[na:na]
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) ~[na:na]
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177) ~[na:na]
@Deadpool 和我能够确定问题。
在 completableFuture 代码的 catch 块内,异常被包装在CompletionException
异常中,这是一个运行时异常。 当端点被击中时,在某些时候CompletionException
异常被解包为MyException
类型的原始异常(已检查的异常)。 这意味着处理程序方法应该处理MyException
而不是CompletionException
类型的异常。
@ExceptionHandler(value = MyException.class)
@ResponseBody
public String handleCompletionException(MyException ex) {
return ex.getMessage();
}
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