项目启动报错availableProcessors is already set to [8] rejecting [8] java

背景项目基于SpringBoot并且集成ElasticSearch，今天在编写测试类准备进行单元测试时，报了如下这个错误。

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'client' defined in class path resource [com/lingyejun/project/ds/EsRepositoryConfig.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.Client]: Factory method 'client' threw exception; nested exception is java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1256) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1105) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:503) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:818) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:724) ... 94 more Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.elasticsearch.client.Client]: Factory method 'client' 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.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ... 107 more Caused by: java.lang.IllegalStateException: availableProcessors is already set to [8], rejecting [8]

检查了原有代码是如下设置的

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

解决查阅资料后发现有两种解决方式
【项目启动报错availableProcessors is already set to [8] rejecting [8]】1.　将代码段：System.setProperty("es.set.netty.runtime.available.processors","false")；挪到静态代码块中。
如下：

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

2.在jvm启动参数加上
-Des.set.netty.runtime.available.processors=false
原因此问题见：Issue with NettyRuntime$AvailableProcessorsHolder: number of available processors · Issue #6956 · netty/netty · GitHub

项目启动报错availableProcessors is already set to [8] rejecting [8]

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原因是程序的其余地方使用了Netty，如大部分项目也会同时使用Redis。这会影响在实例化传输客户端以前初始化处理器的数量。因为在其余地方使用Netty，所以已经进行了初始化而且Netty会对此进行防范，所以首次实例化会因看到的非法状态异常而失败。
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