这篇文章主要介绍“Springboot Retry组件@Recover失效问题怎么解决”，在日常操作中，相信很多人在Springboot Retry组件@Recover失效问题怎么解决问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”Springboot Retry组件@Recover失效问题怎么解决”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
背景
在使用springboot的retry模块时，你是否出现过@Recover注解失效的问题呢？下面我会对该问题进行复现，并且简要的说下解决方法。
问题复现
首先我们引入maven
<dependency> <groupId>org.springframework.retry</groupId> <artifactId>spring-retry</artifactId> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.6</version> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.5.2</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>主类配置EnableRetry注解
package ai.guiji.csdn; import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.retry.annotation.EnableRetry; @EnableRetry@SpringBootApplicationpublic class CsdnApplication { public static void main(String[] args) { SpringApplication.run(CsdnApplication.class, args); }}准备测试的Retry组件类代码
package ai.guiji.csdn.component; import lombok.extern.slf4j.Slf4j;import org.springframework.retry.annotation.Backoff;import org.springframework.retry.annotation.Recover;import org.springframework.retry.annotation.Retryable;import org.springframework.stereotype.Component; import java.util.function.Supplier; @Slf4j@Componentpublic class RetryUtil { @Retryable( value = Exception.class, maxAttempts = 3, backoff = @Backoff(delay = 5000, multiplier = 1.5)) public String retry(Supplier<String> supplier) throws Exception { String result = null; try { result = supplier.get(); } catch (Exception exception) { log.error("异常报错:{}", exception.getMessage()); throw exception; } return result; } @Recover public void recover(Exception e) { log.error("调用超过3次异常"); }}代码说明
我们可以看到retry方法会重试supplier的get结果，捕获异常并抛出异常。这里抛出后会被retry捕获并且重试。
maxAttempts参数为重试的最大次数。
backoff中的delay为两次重试之间的延迟，multiplier为重试阻尼，可以这么理解，每次重试间隔时间为上一次重试间隔时间的倍数。
如果3次重试均抛出异常，则进入recover方法。
编写测试代码
package ai.guiji.csdn.component; import cn.hutool.core.convert.Convert;import cn.hutool.http.HttpUtil;import org.junit.jupiter.api.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest; @SpringBootTestclass RetryUtilTest { @Autowired private RetryUtil retryUtil; @Test void retry() { try { System.out.println(Convert.toStr(retryUtil.retry(() -> HttpUtil.post("xxxx", "")), "haha")); } catch (Exception exception) { exception.printStackTrace(); } }}执行测试结果
2021-11-30 13:37:44.012 ERROR 13600 --- [ main] ai.guiji.csdn.component.RetryUtil : 异常报错:UnknownHostException: xxxx2021-11-30 13:37:49.019 ERROR 13600 --- [ main] ai.guiji.csdn.component.RetryUtil : 异常报错:UnknownHostException: xxxx2021-11-30 13:37:58.787 ERROR 13600 --- [ main] ai.guiji.csdn.component.RetryUtil : 异常报错:UnknownHostException: xxxxorg.springframework.retry.ExhaustedRetryException: Cannot locate recovery method; nested exception is cn.hutool.core.io.IORuntimeException: UnknownHostException: xxxxat org.springframework.retry.annotation.RecoverAnnotationRecoveryHandler.recover(RecoverAnnotationRecoveryHandler.java:70)at org.springframework.retry.interceptor.RetryOperationsInterceptor$ItemRecovererCallback.recover(RetryOperationsInterceptor.java:142)at org.springframework.retry.support.RetryTemplate.handleRetryExhausted(RetryTemplate.java:539)at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:387)at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:225)at org.springframework.retry.interceptor.RetryOperationsInterceptor.invoke(RetryOperationsInterceptor.java:116)at org.springframework.retry.annotation.AnnotationAwareRetryOperationsInterceptor.invoke(AnnotationAwareRetryOperationsInterceptor.java:163)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692)at ai.guiji.csdn.component.RetryUtil$$EnhancerBySpringCGLIB$$d209cbc6.retry(<generated>)at ai.guiji.csdn.component.RetryUtilTest.retry(RetryUtilTest.java:17)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)at java.util.ArrayList.forEach(ArrayList.java:1257)at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)at java.util.ArrayList.forEach(ArrayList.java:1257)at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:69)at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)Caused by: cn.hutool.core.io.IORuntimeException: UnknownHostException: xxxxat cn.hutool.http.HttpRequest.send(HttpRequest.java:1153)at cn.hutool.http.HttpRequest.execute(HttpRequest.java:969)at cn.hutool.http.HttpRequest.execute(HttpRequest.java:940)at cn.hutool.http.HttpUtil.post(HttpUtil.java:216)at cn.hutool.http.HttpUtil.post(HttpUtil.java:197)at ai.guiji.csdn.component.RetryUtilTest.lambda$retry$0(RetryUtilTest.java:17)at ai.guiji.csdn.component.RetryUtil.retry(RetryUtil.java:22)at ai.guiji.csdn.component.RetryUtil$$FastClassBySpringCGLIB$$a565f63f.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:779)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750)at org.springframework.retry.interceptor.RetryOperationsInterceptor$1.doWithRetry(RetryOperationsInterceptor.java:93)at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:329)... 73 moreCaused by: java.net.UnknownHostException: xxxxat java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)at java.net.Socket.connect(Socket.java:589)at java.net.Socket.connect(Socket.java:538)at sun.net.NetworkClient.doConnect(NetworkClient.java:180)at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)at sun.net.www.http.HttpClient.New(HttpClient.java:339)at sun.net.www.http.HttpClient.New(HttpClient.java:357)at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1334)at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1309)at cn.hutool.http.HttpConnection.getOutputStream(HttpConnection.java:451)at cn.hutool.http.HttpRequest.sendFormUrlEncoded(HttpRequest.java:1176)at cn.hutool.http.HttpRequest.send(HttpRequest.java:1145)... 86 more Process finished with exit code 0并没有进入recover方法，注解未触发。
问题解决
这里有个很容易忽视的点，就是retry方法是有返回值的，所以recover方法也必须是相同类型带返回值的方法。所以要把recover方法改一下。
package ai.guiji.csdn.component; import lombok.extern.slf4j.Slf4j;import org.springframework.retry.annotation.Backoff;import org.springframework.retry.annotation.Recover;import org.springframework.retry.annotation.Retryable;import org.springframework.stereotype.Component; import java.util.function.Supplier; @Slf4j@Componentpublic class RetryUtil { @Retryable( value = Exception.class, maxAttempts = 3, backoff = @Backoff(delay = 5000, multiplier = 1.5)) public String retry(Supplier<String> supplier) throws Exception { String result = null; try { result = supplier.get(); } catch (Exception exception) { log.error("异常报错:{}", exception.getMessage()); throw exception; } return result; } @Recover public String recover(Exception e) { log.error("调用超过3次异常"); return "调用超过3次异常"; }}重新执行测试看下结果
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