Springboot Retry组件@Recover失效问题解决方法
时间：2023-01-03 08:30:27|栏目：JAVA代码|点击： 次
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
@SpringBootApplication
public 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;
/** @Author 剑客阿良_ALiang @Date 2021/4/22 16:07 @Description: 重试工具 */
@Slf4j
@Component
public 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
1、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。
2、maxAttempts参数为重试的最大次数。
3、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。
4、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;
/** @Author 剑客阿良_ALaing @Date 2021/11/30 13:08 @Description: */
@SpringBootTest
class 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: xxxx 2021-11-30 13:37:49.019 ERROR 13600 --- [ main] ai.guiji.csdn.component.RetryUtil : 异常报错:UnknownHostException: xxxx 2021-11-30 13:37:58.787 ERROR 13600 --- [ main] ai.guiji.csdn.component.RetryUtil : 异常报错:UnknownHostException: xxxx org.springframework.retry.ExhaustedRetryException: Cannot locate recovery method; nested exception is cn.hutool.core.io.IORuntimeException: UnknownHostException: xxxx at 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: xxxx at 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 more Caused by: java.net.UnknownHostException: xxxx at 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;
/** @Author 剑客阿良_ALiang @Date 2021/4/22 16:07 @Description: 重试工具 */
@Slf4j
@Component
public 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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本文标题：Springboot Retry组件@Recover失效问题解决方法
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