在項(xiàng)目中同時(shí)使用 spring-boot-starter-data-redis 和 spring-boot-starter-data-elasticsearch 的過(guò)程中，遇到了一些問(wèn)題，錯(cuò)誤以及解決方案如下

報(bào)錯(cuò)信息

java.lang.IllegalStateException: Failed to load ApplicationContext

  at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:125)
  at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:108)
  at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:190)
  at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:132)
  at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:246)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
  at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
  at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
  at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
  at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'elasticsearchClient' defined in class path resource [org/springframework/boot/autoconfigure/data/elasticsearch/ElasticsearchAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.transport.TransportClient]: Factory method 'elasticsearchClient' threw exception; nested exception is java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]
  at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627)
  at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
  at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
  at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
  at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
  at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
  at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
  at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
  at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
  at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:743)
  at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:390)
  at org.springframework.boot.SpringApplication.run(SpringApplication.java:312)
  at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:120)
  at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
  at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
  ... 24 more
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.transport.TransportClient]: Factory method 'elasticsearchClient' threw exception; nested exception is java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]
  at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
  at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622)
  ... 42 more
Caused by: java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]
  at io.netty.util.NettyRuntime$AvailableProcessorsHolder.setAvailableProcessors(NettyRuntime.java:51)
  at io.netty.util.NettyRuntime.setAvailableProcessors(NettyRuntime.java:87)
  at org.elasticsearch.transport.netty4.Netty4Utils.setAvailableProcessors(Netty4Utils.java:83)
  at org.elasticsearch.transport.netty4.Netty4Transport.<init>(Netty4Transport.java:112)
  at org.elasticsearch.transport.Netty4Plugin.lambda$getTransports$0(Netty4Plugin.java:86)
  at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:189)
  at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:283)
  at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:128)
  at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:114)
  at org.elasticsearch.transport.client.PreBuiltTransportClient.<init>(PreBuiltTransportClient.java:104)
  at org.springframework.data.elasticsearch.client.TransportClientFactoryBean.buildClient(TransportClientFactoryBean.java:85)
  at org.springframework.data.elasticsearch.client.TransportClientFactoryBean.afterPropertiesSet(TransportClientFactoryBean.java:80)
  at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration.elasticsearchClient(ElasticsearchAutoConfiguration.java:59)
  at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration$$EnhancerBySpringCGLIB$$ccf3afb2.CGLIB$elasticsearchClient$0(<generated>)
  at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration$$EnhancerBySpringCGLIB$$ccf3afb2$$FastClassBySpringCGLIB$$7a884588.invoke(<generated>)
  at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
  at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
  at org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration$$EnhancerBySpringCGLIB$$ccf3afb2.elasticsearchClient(<generated>)
  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.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
  ... 43 more

• 從上面錯(cuò)誤信息最后大致猜測(cè)報(bào)錯(cuò)和 Netty 有關(guān)，然后看了下系統(tǒng)引入的包

<!-- elasticsearch -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>
<!-- redis -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

• 上面的兩個(gè)引入，都間接引入了 Netty 相關(guān)的包，猜測(cè)是 redis 和 elasticsearch 沖突了，于是網(wǎng)上查了下資料，確實(shí)好多人遇到這種情況

解決方案

方案1

• 啟動(dòng)類(lèi)加入代碼 System.setProperty("es.set.netty.runtime.available.processors", "false"); ，如下

public static void main(String[] args) {
    System.setProperty("es.set.netty.runtime.available.processors", "false");
    SpringApplication.run(Bootstrap.class, args);
}

反正我這么做沒(méi)效果，不知為啥他們能行

方案2

• 修改 redis 和 elasticsearch 自動(dòng)裝配的順序，讓 ElasticsearchAutoConfiguration 在 RedisAutoConfiguration 之前啟動(dòng)，新增配置類(lèi)，如下

@Configuration
@Import(ElasticsearchAutoConfiguration.class)
@AutoConfigureBefore(RedisAutoConfiguration.class)
public class ElasticsearchConfig {
}

新增該配置類(lèi)，redis 和 elasticsearch 都能正常使用了，算是解決問(wèn)題，不過(guò)，有點(diǎn)疑問(wèn)，為啥 ElasticsearchAutoConfiguration 在 RedisAutoConfiguration 之前啟動(dòng)就沒(méi)問(wèn)題，之后啟動(dòng)就有問(wèn)題
目前沒(méi)有深入研究，希望知道的小伙伴不寧賜教（說(shuō)明下，項(xiàng)目使用的 spring-boot 的最新版本 2.1.7.RELEASE）

本文完