廣告系統學習過程中問題答疑

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Eureka集群啟動報錯

Answer

因為Eureka在集群啟動過程中，會連接集群中其他的機器進行數據同步，在這個過程中，如果別的服務還沒有啟動完成，就會出現Connection refused: connecterror，當其他節點啟動完成之后，報錯就會消失。

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2019-08-16 10:27:57.038 ERROR 73180 --- [ main] o.s.boot.SpringApplication : Application run failedjava.lang.IllegalStateException: Failed to introspect Class [org.springframework.boot.autoconfigure.kafka.KafkaAnnotationDrivenConfiguration] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:760) ~[spring-core-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:725) ~[spring-core-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:710) ~[spring-core-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.boot.test.mock.mockito.DefinitionsParser.parse(DefinitionsParser.java:62) ~[spring-boot-test-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.boot.test.mock.mockito.MockitoPostProcessor.postProcessBeanFactory(MockitoPostProcessor.java:141) ~[spring-boot-test-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.boot.test.mock.mockito.MockitoPostProcessor.postProcessBeanFactory(MockitoPostProcessor.java:133) ~[spring-boot-test-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:286) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:174) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:127) [spring-boot-test-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:44) [spring-boot-test-autoconfigure-2.1.5.RELEASE.jar:2.1.5.RELEASE]at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) [spring-test-5.1.7.RELEASE.jar:5.1.7.RELEASE]at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.12.jar:4.12]at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) [junit-rt.jar:na]at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) [junit-rt.jar:na]at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) [junit-rt.jar:na]at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) [junit-rt.jar:na] Caused by: java.lang.NoClassDefFoundError: Lorg/springframework/kafka/listener/AfterRollbackProcessor;at java.lang.Class.getDeclaredFields0(Native Method) ~[na:1.8.0_171]at java.lang.Class.privateGetDeclaredFields(Class.java:2583) ~[na:1.8.0_171]at java.lang.Class.getDeclaredFields(Class.java:1916) ~[na:1.8.0_171]at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:755) ~[spring-core-5.1.7.RELEASE.jar:5.1.7.RELEASE]... 40 common frames omitted Caused by: java.lang.ClassNotFoundException: org.springframework.kafka.listener.AfterRollbackProcessorat java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_171]at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_171]at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_171]at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_171]... 44 common frames omitted2019-08-16 10:27:57.119 INFO 73180 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$2c3f141a] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

查看這個錯誤，是在加載org.springframework.kafka.listener.AfterRollbackProcessor的時候，沒有找到對應的class，可是我們明明添加了依賴呀？

<!-- kafka 依賴 --><dependency><groupId>org.springframework.kafka</groupId><artifactId>spring-kafka</artifactId><version>2.1.5.RELEASE</version></dependency>

ok, 我們來查詢，首先，在實際工作中，大家為了最快的解決問題，必須借助搜索引擎的力量，作為一個合格的程序猿，盡量少baidu....我一般習慣https://cn.bing.com/ ,搜索相關報錯，可以看到第一個就是程序界的錯誤大佬，

stackworkflow解決bug傳送門 .

說的非常清楚：

Spring for Apache Kafka 2.0.x is not compatible with Spring Boot 2.1.x. You have to use Spring-Kafka 2.2.x. More over would be better to just rely on the dependency from Spring Boot per se. please, see https://start.spring.io/ for more info how properly start the project for Spring Boot.

And please, don’t duplicate your question in different places if that was not asked.

錯誤說明，在org.springframework.kafka,因為我們使用的springboot 版本是2.1.5.RELEASE，所以版本存在差異化，因此我們修改版本為:

<!-- kafka 依賴 --><dependency><groupId>org.springframework.kafka</groupId><artifactId>spring-kafka</artifactId><version>2.2.8.RELEASE</version></dependency>

再次啟動，一切ok。

轉載于:https://www.cnblogs.com/zhangpan1244/p/11379426.html

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