Failed to bind NettyServer on /192.178.103.223:20880, cause: Failed to bind to: /0.0.0.0:20880

本文链接：https://blog.youkuaiyun.com/locat_csdn/article/details/79737614

本文介绍了在使用Dubbo框架时遇到的端口冲突问题及其解决办法。具体表现为尝试启动服务时，由于指定端口被占用而导致启动失败。文中详细分析了错误日志，并给出了修改配置文件中端口号的具体步骤。

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使用dubbo技术调用分布式服务时,报此错误,原因及解决方法附后.

java.lang.IllegalStateException: Failed to load ApplicationContext

at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:124)
at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:117)
at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83)
at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
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$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$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: com.alibaba.dubbo.rpc.RpcException: Fail to start server(url: dubbo://192.178.103.223:20880/com.locat.server.api.DemoService?anyhost=true&application=demo-consumer&channel.readonly.sent=true&codec=dubbo&dubbo=2.5.4&heartbeat=60000&interface=com.locat.server.api.DemoService&methods=sayHello&pid=7928&revision=1.0-SNAPSHOT&side=provider&timestamp=1522287051815) Failed to bind NettyServer on /192.178.103.223:20880, cause: Failed to bind to: /0.0.0.0:20880

分析:

导致这种错误的原因是:20880端口已被占用,20880端口是服务提供方的服务暴露端口,使用

<dubbo:protocol name="dubbo" port="20880"/>这种配置方式.因此解决方法很简单,到服务提供方的项目中,将port的值改为20990,然后重启项目,即可.