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Comment réparer l'avertissement «Transport epoll natif de Netty trouvé dans le chemin de classe, mais epoll n'est pas disponible. Utiliser NIO à la place» avertissement?

J'utilise Cassandra et, au démarrage, Netty affiche un avertissement avec une trace de pile:

Trouvé le transport epoll natif de Netty dans le chemin de classe, mais epoll n'est pas disponible. Utiliser NIO à la place. "

L'application fonctionne normalement, mais existe-t-il un moyen de corriger l'avertissement?

Voici la trace complète de la pile:

16:29:46 WARN  com.datastax.driver.core.NettyUtil - Found Netty's native epoll transport in the classpath, but epoll is not available. Using NIO instead.
Java.lang.UnsatisfiedLinkError: no netty-transport-native-epoll in Java.library.path
    at Java.lang.ClassLoader.loadLibrary(ClassLoader.Java:1867)
    at Java.lang.Runtime.loadLibrary0(Runtime.Java:870)
    at Java.lang.System.loadLibrary(System.Java:1122)
    at io.netty.util.internal.NativeLibraryLoader.load(NativeLibraryLoader.Java:168)
    at io.netty.channel.epoll.Native.<clinit>(Native.Java:49)
    at io.netty.channel.epoll.Epoll.<clinit>(Epoll.Java:30)
    at Java.lang.Class.forName0(Native Method)
    at Java.lang.Class.forName(Class.Java:264)
    at com.datastax.driver.core.NettyUtil.<clinit>(NettyUtil.Java:68)
    at com.datastax.driver.core.NettyOptions.eventLoopGroup(NettyOptions.Java:101)
    at com.datastax.driver.core.Connection$Factory.<init>(Connection.Java:709)
    at com.datastax.driver.core.Cluster$Manager.init(Cluster.Java:1386)
    at com.datastax.driver.core.Cluster.init(Cluster.Java:162)
    at com.datastax.driver.core.Cluster.connectAsync(Cluster.Java:341)
    at com.datastax.driver.core.Cluster.connect(Cluster.Java:286)
    at org.springframework.cassandra.config.CassandraCqlSessionFactoryBean.connect(CassandraCqlSessionFactoryBean.Java:100)
    at org.springframework.cassandra.config.CassandraCqlSessionFactoryBean.afterPropertiesSet(CassandraCqlSessionFactoryBean.Java:94)
    at org.springframework.data.cassandra.config.CassandraSessionFactoryBean.afterPropertiesSet(CassandraSessionFactoryBean.Java:60)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.Java:1642)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.Java:1579)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.Java:545)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.Java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.Java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.Java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.Java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.Java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.Java:207)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.Java:1128)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.Java:1056)
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.Java:835)
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.Java:741)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.Java:467)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.Java:1128)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.Java:1023)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.Java:510)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.Java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.Java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.Java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.Java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.Java:197)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.Java:351)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.Java:108)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.Java:1486)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.Java:1231)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.Java:543)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.Java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.Java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.Java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.Java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.Java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.Java:207)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.Java:1128)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.Java:1056)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.Java:566)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.Java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.Java:349)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.Java:1219)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.Java:543)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.Java:482)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.Java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.Java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.Java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.Java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.Java:751)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.Java:861)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.Java:541)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.Java:122)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.Java:761)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.Java:371)
    at org.springframework.boot.SpringApplication.run(SpringApplication.Java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.Java:1186)
    at org.springframework.boot.SpringApplication.run(SpringApplication.Java:1175)
    ...
javacassandranetty
13
Philipp Claßen

Si vous utilisez Linux, vous pouvez utiliser le pilote Linux natif. Par exemple, si vous utilisez Maven, ajoutez une dépendance comme celle-ci:

<dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-transport-native-epoll</artifactId>
  <version>4.0.27.Final</version>
  <classifier>linux-x86_64</classifier>
</dependency>

Vous pouvez également supprimer l'avertissement en définissant -Dcom.datastax.driver.FORCE_NIO=true. Comme ce n'est qu'une optimisation des performances, c'est une option viable pour l'ignorer.

Pour plus d'informations, reportez-vous à la documentation Netty sur les transports natifs .

16
Philipp Claßen