一、pom.xml需要引入的依赖
1 <!-- springboot升级到2.6.7，同样适用于2.7.0，2.7.18等 --> 2 <parent> 3 <groupId>org.springframework.boot</groupId> 4 <artifactId>spring-boot-starter-parent</artifactId> 5 <version>2.6.7</version> 6 <relativePath/> <!-- lookup parent from repository --> 7 </parent> 8 9 <!-- hystrix需要升级到2.x以上版本 --> 10 <dependency> 11 <groupId>org.springframework.cloud</groupId> 12 <artifactId>spring-cloud-starter-netflix-hystrix</artifactId> 13 <version>2.2.10.RELEASE</version> 14 </dependency> 15 16 <!-- 升级后运行时缺失依赖 --> 17 <dependency> 18 <groupId>org.hdrhistogram</groupId> 19 <artifactId>HdrHistogram</artifactId> 20 <version>2.1.12</version> 21 </dependency>View Code
二、项目开启熔断器开关
2.1 注解方式
@EnableHystrix
@EnableCircuitBreaker
注：项目启动类中加上以上注解，以上两者取其一即可；
2.2 xml方式
以上注解方式底层就是实例化此类：
三、依赖类缺失问题
此时运行项目将报以下错误：
D:\JDK\jdk1.8\bin\java.exe -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:55698,suspend=y,server=n -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -javaagent:C:\Users\mingming.chen\AppData\Local\JetBrains\IntelliJIdea2021.3\captureAgent\debugger-agent.jar -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath 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IDEA 2021.3\lib\idea_rt.jar" com.example.springbootdame.PersonalAssistantApplication Connected to the target VM, address: '127.0.0.1:55698', transport: 'socket' 2024-01-16 15:44:01.575 [al-service] [main] WARN [org.springframework.context.annotation.AnnotationConfigApplicationContext] -Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configurationPropertiesBeans' defined in class path resource [org/springframework/cloud/autoconfigure/ConfigurationPropertiesRebinderAutoConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.context.properties.ConfigurationPropertiesBeans] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2] 2024-01-16 15:44:01.581 [al-service] [main] INFO [org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener] - Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2024-01-16 15:44:01.603 [al-service] [main] ERROR [org.springframework.boot.SpringApplication] -Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configurationPropertiesBeans' defined in class path resource [org/springframework/cloud/autoconfigure/ConfigurationPropertiesRebinderAutoConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.context.properties.ConfigurationPropertiesBeans] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:597) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213) at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:270) at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:762) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:567) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415) at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:164) at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:212) at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:117) at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:74) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:85) at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:66) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:120) at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:114) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:65) at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:339) at org.springframework.boot.SpringApplication.run(SpringApplication.java:297) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1312) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) at com.example.springbootdame.PersonalAssistantApplication.main(PersonalAssistantApplication.java:12) Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.context.properties.ConfigurationPropertiesBeans] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2] at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:485) at org.springframework.util.ReflectionUtils.doWithLocalMethods(ReflectionUtils.java:321) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:232) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:210) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(InitDestroyAnnotationBeanPostProcessor.java:149) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:305) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:1116) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ... 30 common frames omitted Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/context/properties/ConfigurationBeanFactoryMetadata at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.getDeclaredMethods(Class.java:1975) at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:467) ... 37 common frames omitted Caused by: java.lang.ClassNotFoundException: org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 41 common frames omitted 2024-01-16 15:44:01.606 [al-service] [main] ERROR [org.springframework.boot.SpringApplication] -Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'configurationPropertiesBeans' defined in class path resource [org/springframework/cloud/autoconfigure/ConfigurationPropertiesRebinderAutoConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.context.properties.ConfigurationPropertiesBeans] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:597) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213) at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:270) at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:762) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:567) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415) at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:164) at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:212) at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:117) at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:74) at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:85) at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:66) at java.util.ArrayList.forEach(ArrayList.java:1257) at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:120) at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:114) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:65) at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:339) at org.springframework.boot.SpringApplication.run(SpringApplication.java:297) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1312) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) at com.example.springbootdame.PersonalAssistantApplication.main(PersonalAssistantApplication.java:12) Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.context.properties.ConfigurationPropertiesBeans] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2] at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:485) at org.springframework.util.ReflectionUtils.doWithLocalMethods(ReflectionUtils.java:321) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:232) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:210) at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(InitDestroyAnnotationBeanPostProcessor.java:149) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:305) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:1116) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ... 30 common frames omitted Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/context/properties/ConfigurationBeanFactoryMetadata at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.getDeclaredMethods(Class.java:1975) at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:467) ... 37 common frames omitted Caused by: java.lang.ClassNotFoundException: org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 41 common frames omitted Disconnected from the target VM, address: '127.0.0.1:55698', transport: 'socket' Process finished with exit code 1View Code
报错原因是缺失特定路径下的类org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata，如下所示:
需要解决此问题，自定义此类即可,注意一定要定义成框架所需的包路径（package org.springframework.boot.context.properties;）：
1 package org.springframework.boot.context.properties;
2
3 import org.springframework.beans.BeansException;
4 import org.springframework.beans.factory.config.BeanDefinition;
5 import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
6 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
7 import org.springframework.beans.factory.support.BeanDefinitionRegistry;
8 import org.springframework.beans.factory.support.GenericBeanDefinition;
9 import org.springframework.beans.factory.support.RootBeanDefinition;
10 import org.springframework.context.ApplicationContext;
11 import org.springframework.context.ApplicationContextAware;
12 import org.springframework.context.ConfigurableApplicationContext;
13 import org.springframework.core.annotation.AnnotationUtils;
14 import org.springframework.util.ClassUtils;
15 import org.springframework.util.ReflectionUtils;
16
17 import java.lang.annotation.Annotation;
18 import java.lang.reflect.Method;
19 import java.util.HashMap;
20 import java.util.Map;
21 import java.util.concurrent.atomic.AtomicReference;
22
23 /**
24 * @Author: mingming.chen
25 * @Date: 2024/1/15 14 26
26 * @Description:
27 **/
28 public class ConfigurationBeanFactoryMetadata implements BeanFactoryPostProcessor {
29
30 private ConfigurableListableBeanFactory beanFactory;
31
32 private Map<String, MetaData> beans = new HashMap<String, MetaData>();
33
34 @Override
35 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
36 throws BeansException {
37 this.beanFactory = beanFactory;
38 for (String name : beanFactory.getBeanDefinitionNames()) {
39 BeanDefinition definition = beanFactory.getBeanDefinition(name);
40 String method = definition.getFactoryMethodName();
41 String bean = definition.getFactoryBeanName();
42 if (method != null && bean != null) {
43 this.beans.put(name, new MetaData(bean, method));
44 }
45 }
46 }
47
48 public <A extends Annotation> Map<String, Object> getBeansWithFactoryAnnotation(
49 Class<A> type) {
50 Map<String, Object> result = new HashMap<String, Object>();
51 for (String name : this.beans.keySet()) {
52 if (findFactoryAnnotation(name, type) != null) {
53 result.put(name, this.beanFactory.getBean(name));
54 }
55 }
56 return result;
57 }
58
59 public <A extends Annotation> A findFactoryAnnotation(String beanName,
60 Class<A> type) {
61 Method method = findFactoryMethod(beanName);
62 return (method == null ? null : AnnotationUtils.findAnnotation(method, type));
63 }
64
65 private Method findFactoryMethod(String beanName) {
66 if (!this.beans.containsKey(beanName)) {
67 return null;
68 }
69 final AtomicReference<Method> found = new AtomicReference<Method>(null);
70 MetaData meta = this.beans.get(beanName);
71 final String factory = meta.getMethod();
72 Class<?> type = this.beanFactory.getType(meta.getBean());
73 ReflectionUtils.doWithMethods(type, new ReflectionUtils.MethodCallback() {
74 @Override
75 public void doWith(Method method)
76 throws IllegalArgumentException, IllegalAccessException {
77 if (method.getName().equals(factory)) {
78 found.compareAndSet(null, method);
79 }
80 }
81 });
82 return found.get();
83 }
84
85 private static class MetaData {
86
87 private String bean;
88
89 private String method;
90
91 MetaData(String bean, String method) {
92 this.bean = bean;
93 this.method = method;
94 }
95
96 public String getBean() {
97 return this.bean;
98 }
99
100 public String getMethod() {
101 return this.method;
102 }
103
104 }
105
106 }
View Code
四、版本匹配安全检查问题
此时，同样启动项目，报以下错误，并中断进程：
如上所示，由于spring-cloud-starter-netflix-hystrix 2021年后不更新，此依赖包对应的springCloud版本和springboot版本不匹配，会报版本不匹配异常，需要禁用安全检查功能，如下配置在application.yml文件中：
spring:
cloud:
compatibility-verifier:
enabled: false
检查配置说明：
兼容性验证器是Spring Cloud框架中的一个功能，用于确保所使用的Spring Boot版本与Spring Cloud版本兼容。当Spring Boot版本与Spring Cloud版本不兼容时，可能会导致应用程序在运行时出现问题。
在上述代码中，cloud.compatibility-verifier.enabled属性被设置为false，意味着禁用了兼容性验证器。这意味着应用程序将不再执行Spring Boot与Spring Cloud版本的兼容性检查。
禁用兼容性验证器可能会导致以下问题：
- 不兼容的Spring Boot和Spring Cloud版本可能导致应用程序在运行时出现错误或异常。
- 可能会错过一些Spring Cloud提供的新功能或修复的问题。
因此，在禁用兼容性验证器之前，应该确保所使用的Spring Boot版本与Spring Cloud版本兼容，并且了解可能的风险和影响。
五、测试验证
- 熔断；
- 降级；
- 线程池隔离：并发数超过设置线程池个数请求进行降级；
六、结论
完成以上前四步即可在springboot2.6.x和2.7.x使用hystrix组件。
标签：java,springboot,hystrix,jar,springframework,MAVEN,org,2.7,MavenRepository From： https://www.cnblogs.com/chenmingming0225/p/17980039