springcloud配合eureka遇到的巨坑
springcloud配合eureka遇到一个巨坑，这个问题困扰了楼主整整3天！！！
问题描述：
项目在idea能够启动，注册服务，心跳检测一切正常。但是打包后放入服务器中，发现项目启动正常，服务注册正常，但是过了30秒后，eureka开始报错，报错内容如下：
2021-01-26 13:09:08.973 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Disable delta property : false
2021-01-26 13:09:08.973 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Single vip registry refresh property : null
2021-01-26 13:09:08.976 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Force full registry fetch : false
2021-01-26 13:09:08.977 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Application is null : false
2021-01-26 13:09:08.986 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Registered Applications size is zero : true
2021-01-26 13:09:08.989 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Application version is -1: false
2021-01-26 13:09:08.990 INFO 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server
2021-01-26 13:09:09.044 ERROR 21396 --- [freshExecutor-0] c.n.d.provider.DiscoveryJerseyProvider : Unexpected error occurred during de-serialization of discovery data, done connection cleanup
2021-01-26 13:09:09.049 ERROR 21396 --- [freshExecutor-0] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error
javax.ws.rs.WebApplicationException: null
at com.netflix.discovery.provider.DiscoveryJerseyProvider.readFrom(DiscoveryJerseyProvider.java:107) ~[eureka-client-1.9.3.jar:1.9.3]
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:634) ~[jersey-client-1.19.1.jar:1.19.1]
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:586) ~[jersey-client-1.19.1.jar:1.19.1]
at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplicationsInternal(AbstractJerseyEurekaHttpClient.java:198) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplications(AbstractJerseyEurekaHttpClient.java:165) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:89) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1051) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:965) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1473) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1440) [eureka-client-1.9.3.jar:1.9.3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_181]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]
2021-01-26 13:09:09.050 WARN 21396 --- [freshExecutor-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with message: null
2021-01-26 13:09:09.063 ERROR 21396 --- [freshExecutor-0] c.n.d.provider.DiscoveryJerseyProvider : Unexpected error occurred during de-serialization of discovery data, done connection cleanup
2021-01-26 13:09:09.064 ERROR 21396 --- [freshExecutor-0] c.n.d.s.t.d.RedirectingEurekaHttpClient : Request execution error
javax.ws.rs.WebApplicationException: null
at com.netflix.discovery.provider.DiscoveryJerseyProvider.readFrom(DiscoveryJerseyProvider.java:107) ~[eureka-client-1.9.3.jar:1.9.3]
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:634) ~[jersey-client-1.19.1.jar:1.19.1]
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:586) ~[jersey-client-1.19.1.jar:1.19.1]
at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplicationsInternal(AbstractJerseyEurekaHttpClient.java:198) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.getApplications(AbstractJerseyEurekaHttpClient.java:165) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1051) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:965) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1473) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1440) [eureka-client-1.9.3.jar:1.9.3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_181]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]
2021-01-26 13:09:09.068 WARN 21396 --- [freshExecutor-0] c.n.d.s.t.d.RetryableEurekaHttpClient : Request execution failed with message: null
2021-01-26 13:09:09.069 ERROR 21396 --- [freshExecutor-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_RESOURCES/localhost:resources:8000 - was unable to refresh its cache! status = Cannot execute request on any known server
com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1051) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:965) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient.refreshRegistry(DiscoveryClient.java:1473) [eureka-client-1.9.3.jar:1.9.3]
at com.netflix.discovery.DiscoveryClient$CacheRefreshThread.run(DiscoveryClient.java:1440) [eureka-client-1.9.3.jar:1.9.3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_181]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]
这个报错，我一直在百度，把百度翻烂了，问题任然未解决，最后在一次偶然的机会，发现了问题：
项目启动注册的eureka.instance.instance-id是主机名称+模块名+端口号
但是注册后eureka的检测服务查找的是ip地址+模块名+端口号
这就导致了项目启动没错，但是过一会后就会发生报错
这真的是巨坑！！！
最后解决办法：在配置文件中配置eureka的instance-id即可
--------------------------------------------无用的分割线--------------------------------------------------
以上其实没有解决问题。。。
最终一个机缘巧合的情况下，发现少了一个依赖：
<dependency>
<groupId>com.github.vlsi.compactmap</groupId>
<artifactId>compactmap</artifactId>
<version>1.2.1</version>
</dependency>
别问原因，我也不知道。。