java.lang.IllegalStateException: availableProcessors is already set to [12], rejecting [12]

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#netty冲突 #junit #srpingboot #elasticsearch

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SpringBoot项目启动时遇到java.lang.IllegalStateException，问题根源在于Elasticsearch的Netty冲突。解决办法包括在JUnit测试时采用特定注解或调整TestExecutionListener配置。详细步骤包括在测试类上添加特定注解，确保DependencyInjectionTestExecutionListener正确运行。

srpingboot启动项目会报以下异常，问题原因由于es的netty冲突导致的，问题细节不再赘述

Caused by: java.lang.IllegalStateException: availableProcessors is already set to [12], rejecting [12]
	at io.netty.util.NettyRuntime$AvailableProcessorsHolder.setAvailableProcessors(NettyRuntime.java:51)
	at io.netty.util.NettyRuntime.setAvailableProcessors(NettyRuntime.java:87)
	at org.elasticsearch.transport.netty4.Netty4Utils.setAvailableProcessors(Netty4Utils.java:79)
	at org.elasticsearch.transport.netty4.Netty4Transport.<init>(Netty4Transport.java:112)
	at org.elasticsearch.transport.Netty4Plugin.lambda$getTransports$0(Netty4Plugin.java:85)
	at org.elasticsearch.client.transport.TransportClient.buildTemplate(TransportClient.java:192)
	at org.elasticsearch.client.transport.TransportClient.<init>(TransportClient.java:288)
	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 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)
	... 70 more

解决方法：

    public static void main(String[] args) {

        //在main方法里插入下面的代码以解决es的netty冲突问题
        System.setProperty("es.set.netty.runtime.available.processors", "false");

        SpringApplication.run(Application.class,args);
    }

在用junit测试的时候也会报这个异常，解决方法如下：

第一步：


public class TestListener implements TestExecutionListener {

    @Override
    public void beforeTestClass(TestContext testContext) throws Exception {
        //设置环境变量 解决es冲突
        System.setProperty("es.set.netty.runtime.available.processors", "false");
    }

}

第二步：在springboot的junit测试类头上加上注解

@TestExecutionListeners(listeners = {TestListener.class,DependencyInjectionTestExecutionListener.class})

或者

@TestExecutionListeners(value = { TestListener.class },mergeMode = MergeMode.MERGE_WITH_DEFAULTS)

DependencyInjectionTestExecutionListener类为默认的监听方法，必须加上，否则junit在运行测试用例前不会运行应用。详情参考https://www.baeldung.com/spring-testexecutionlistener

示例如下：

//@TestExecutionListeners(listeners = {TestListener.class,DependencyInjectionTestExecutionListener.class})
@TestExecutionListeners(listeners = {TestListener.class},mergeMode = TestExecutionListeners.MergeMode.MERGE_WITH_DEFAULTS)
@RunWith(SpringRunner.class)
@SpringBootTest
public class ApplationTests {

    @Test
    public void test(){
    }
}

这样处理完以后问题就会得到解决。