Spring重试:注释为@Recover未被调用的方法
Spring重试:注释为@Recover未被调用的方法
提问于 2018-05-14 01:33:08
我正在测试一次春季重试，但似乎没有调用恢复。试着让它发挥作用，但似乎是穷途末路。我传递给了“恢复无参数，Throwable，Exception”。更改了重试依赖版本，并且它似乎包含在aop中，用于spring引导并删除它。“不断恢复”没有被调用，下面的异常是messege。
请求处理失败；嵌套异常为org.springframework.retry.ExhaustedRetryException:无法找到恢复方法；嵌套异常为java.lang.ArithmeticException: / by 0]，其根本原因是
任何帮助都将不胜感激。
我的代码如下所示。
配置类
package hello;
import java.util.Arrays;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.retry.annotation.EnableRetry;
import org.springframework.retry.annotation.Retryable;
@SpringBootApplication
@EnableRetry
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Bean
public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
return args -> {
System.out.println("Let's inspect the beans provided by `Spring Boot:");`
String[] beanNames = ctx.getBeanDefinitionNames();
Arrays.sort(beanNames);
for (String beanName : beanNames) {
System.out.println(beanName);
}
};
}
}Rest控制器类；
package hello;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.retry.annotation.Backoff;
import org.springframework.web.bind.annotation.RequestMapping;
@RestController
public class HelloController {
@Autowired
private SomeService service;
@RequestMapping("/")
public String hello() {
String result = service.getInfo();
return result;
}
}服务等级是；
package hello;
import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.Recover;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;
@Service
public class SomeService {
@Retryable(value = ArithmeticException.class, maxAttempts = 3, `backoff = @Backoff(delay = 3000))`
public String getInfo() {
System.out.println("How many time will this be printed?");
return "Hello" + 4/0;
}
@Recover
public void helpHere(ArithmeticException cause) {
System.out.println(cause);
System.out.println("Recovery place!");
}
}这是我的依赖项列表
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- tag::actuator[] -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- end::actuator[] -->
<!-- tag::tests[] -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- end::tests[] -->
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
</dependencies>尝试捕捉和各种各样的参数
@Service
public class SomeService {
@Retryable(value = {ArithmeticException.class}, maxAttempts = 3, `backoff = @Backoff(delay = 3000))`
public String getInfo() {
try {
System.out.println("How many time will this be printed?");
return "Hello" + 4/0;
} catch(ArithmeticException ex) {
System.out.println("In the arthemetic Exception");
throw new ArithmeticException();
}
}
@Recover
public void helpHere(ArithmeticException cause) {
System.out.println(cause);
System.out.println("Recovery place! ArithmeticException");
}
@Recover
public void helpHere(Exception cause ) {
System.out.println(cause);
System.out.println("Recovery place! Exception");
}
@Recover
public void helpHere(Throwable cause) {
System.out.println(cause);
System.out.println("Recovery place! Exception");
}
@Recover
public void helpHere() {
System.out.println("Recovery place! Exception");
}
}控制台屏幕截图
回答 3
Stack Overflow用户
回答已采纳
发布于 2018-05-14 02:51:40
您应该使用try-catch来处理它。这里的例子
@Retryable(value = ArithmeticException.class, maxAttempts = 5, backoff = @Backoff(delay = 3000))
public String getInfo() {
try {
System.out.println("How many time will this be printed?");
return "Hello" + 4 / 0;
} catch (ArithmeticException ex) {
// will be retried
throw ex;
}
}throw ex;是必须的，因为它告诉Spring应用重试处理。使用@Recover，我们为ArithmeticException定义了一个单独的恢复方法。这使我们可以在ArithmeticException的可还原方法失败时运行特殊的恢复代码。
您可以参考更多关于如何处理Spring重试？的信息
编辑
根据最新的异常，尝试为spring-retry提供版本。
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
<version>1.2.1.RELEASE</version>
</dependency>Stack Overflow用户
发布于 2018-05-14 13:33:25
我终于得到了答案。
对于要调用带有@Recover注释的方法，它必须具有相同的方法参数(加上异常)和相同的返回类型。
我用不同类型的异常参数对其进行了测试，如果方法具有更具体的异常类型，则调用它们。如果我有这样的方法，将被调用，而不是一个带有Exception参数的方法。但是，如果我有多个恢复方法，那么只会调用一个带有更具体异常参数的方法。
@Recover
public String helpHere(ArithmeticException cause) {最终代码示例
package hello;
import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.Recover;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;
@Service
public class SomeService {
@Retryable(maxAttempts = 3, backoff = @Backoff(delay = 3000))
public String getInfo() {
try {
System.out.println("How many time will this be printed?");
return "Hello" + 4/0;
} catch(Exception ex) {
System.out.println("In the arthemetic Exception");
throw new ArithmeticException();
}
}
@Recover
public String helpHere(ArithmeticException cause) {
System.out.println("Recovery place! ArithmeticException");
return "Hello";
}
@Recover
public String helpHere(Exception cause ) {
System.out.println("Recovery place! Exception");
return "Hello";
}
@Recover
public String helpHere() {
System.out.println("Recovery place! Exception");
return "Hello";
}
@Recover
public String helpHere(Throwable cause) {
System.out.println("Recovery place! Throwable");
return "Hello";
}
Stack Overflow用户
发布于 2022-08-17 05:50:10
@Recover方法应该具有与编写retry方法所用的原始方法相同的返回类型和抛出的异常。
@Recover公共String connectionException(RetryException e)抛出e.getMessage()；}
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50322126
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