1、SpringCloud客户端Client启动时自动停止
启动日志如下：
2019-02-18 15:55:16.519 INFO 15976 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$2756c514] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.2.RELEASE)
2019-02-18 15:55:19.126 INFO 15976 --- [ main] c.hand.user.ShopServiceUserApplication : No active profile set, falling back to default profiles: default
2019-02-18 15:55:19.529 INFO 15976 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=d9a7a1a0-c71d-3128-b239-ea6e82c6b865
2019-02-18 15:55:19.575 INFO 15976 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$2756c514] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-02-18 15:55:19.592 WARN 15976 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2019-02-18 15:55:19.593 INFO 15976 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2019-02-18 15:55:19.601 WARN 15976 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2019-02-18 15:55:19.602 INFO 15976 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2019-02-18 15:55:23.326 INFO 15976 --- [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2019-02-18 15:55:25.701 INFO 15976 --- [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2019-02-18 15:55:25.806 INFO 15976 --- [ main] o.s.c.n.eureka.InstanceInfoFactory : Setting initial instance status as: STARTING
2019-02-18 15:55:25.846 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Initializing Eureka in region us-east-1
2019-02-18 15:55:26.779 INFO 15976 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON encoding codec LegacyJacksonJson
2019-02-18 15:55:26.779 INFO 15976 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using JSON decoding codec LegacyJacksonJson
2019-02-18 15:55:26.917 INFO 15976 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML encoding codec XStreamXml
2019-02-18 15:55:26.917 INFO 15976 --- [ main] c.n.d.provider.DiscoveryJerseyProvider : Using XML decoding codec XStreamXml
2019-02-18 15:55:27.153 INFO 15976 --- [ main] c.n.d.s.r.aws.ConfigClusterResolver : Resolving eureka endpoints via configuration
2019-02-18 15:55:27.154 WARN 15976 --- [ main] c.n.d.s.r.aws.ConfigClusterResolver : Invalid eureka server URI: /; removing from the server pool
2019-02-18 15:55:27.822 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Disable delta property : false
2019-02-18 15:55:27.822 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Single vip registry refresh property : null
2019-02-18 15:55:27.822 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Force full registry fetch : false
2019-02-18 15:55:27.822 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Application is null : false
2019-02-18 15:55:27.822 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Registered Applications size is zero : true
2019-02-18 15:55:27.823 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Application version is -1: true
2019-02-18 15:55:27.823 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Getting all instance registry info from the eureka server
2019-02-18 15:55:28.089 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : The response status is 200
2019-02-18 15:55:28.093 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Starting heartbeat executor: renew interval is: 30
2019-02-18 15:55:28.096 INFO 15976 --- [ main] c.n.discovery.InstanceInfoReplicator : InstanceInfoReplicator onDemand update allowed rate per min is 4
2019-02-18 15:55:28.101 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Discovery Client initialized at timestamp 1550476528099 with initial instances count: 3
2019-02-18 15:55:28.102 INFO 15976 --- [ main] o.s.c.n.e.s.EurekaServiceRegistry : Registering application USER-SERVICE with eureka with status UP
2019-02-18 15:55:28.103 INFO 15976 --- [ main] com.netflix.discovery.DiscoveryClient : Saw local status change event StatusChangeEvent [timestamp=1550476528103, current=UP, previous=STARTING]
2019-02-18 15:55:28.105 INFO 15976 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_USER-SERVICE/localhost:user-service:8080: registering service...
2019-02-18 15:55:28.123 INFO 15976 --- [ main] c.hand.user.ShopServiceUserApplication : Started ShopServiceUserApplication in 14.817 seconds (JVM running for 16.382)
2019-02-18 15:55:28.133 INFO 15976 --- [ Thread-5] o.s.c.n.e.s.EurekaServiceRegistry : Unregistering application USER-SERVICE with eureka with status DOWN
2019-02-18 15:55:28.133 WARN 15976 --- [ Thread-5] com.netflix.discovery.DiscoveryClient : Saw local status change event StatusChangeEvent [timestamp=1550476528133, current=DOWN, previous=UP]
2019-02-18 15:55:28.144 INFO 15976 --- [ Thread-5] com.netflix.discovery.DiscoveryClient : Shutting down DiscoveryClient ...
2019-02-18 15:55:28.161 INFO 15976 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_USER-SERVICE/localhost:user-service:8080 - registration status: 204
2019-02-18 15:55:28.161 INFO 15976 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_USER-SERVICE/localhost:user-service:8080: registering service...
2019-02-18 15:55:28.167 INFO 15976 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_USER-SERVICE/localhost:user-service:8080 - registration status: 204
2019-02-18 15:55:28.168 INFO 15976 --- [ Thread-5] com.netflix.discovery.DiscoveryClient : Unregistering ...
2019-02-18 15:55:28.175 INFO 15976 --- [ Thread-5] com.netflix.discovery.DiscoveryClient : DiscoveryClient_USER-SERVICE/localhost:user-service:8080 - deregister status: 200
2019-02-18 15:55:28.186 INFO 15976 --- [ Thread-5] com.netflix.discovery.DiscoveryClient : Completed shut down of DiscoveryClient
解决方法：
pom.xml中添加如下依赖：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
2、SpringCloud Feign报错：PathVariable annotation was empty on param 0
错误日志如下：
Caused by: java.lang.IllegalStateException: PathVariable annotation was empty on param 0.
at feign.Util.checkState(Util.java:128) ~[feign-core-9.5.1.jar:na]
at org.springframework.cloud.openfeign.annotation.PathVariableParameterProcessor.processArgument(PathVariableParameterProcessor.java:51) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.cloud.openfeign.support.SpringMvcContract.processAnnotationsOnParameter(SpringMvcContract.java:238) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:110) ~[feign-core-9.5.1.jar:na]
at org.springframework.cloud.openfeign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:133) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:66) ~[feign-core-9.5.1.jar:na]
at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:146) ~[feign-core-9.5.1.jar:na]
at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:53) ~[feign-core-9.5.1.jar:na]
at feign.Feign$Builder.target(Feign.java:218) ~[feign-core-9.5.1.jar:na]
at org.springframework.cloud.openfeign.HystrixTargeter.target(HystrixTargeter.java:39) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:223) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:244) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
... 30 common frames omitted
写Feign调用的时候@PathVariable中的value不能省略
注意：
- 其他标注在方法上的SpringMVC注解不能省略（如@RequestParam、@RequestBody等）
- @RequestBody的value可以省略，其他的不要省略
- 禁止在标注@FeignClient的类上标注@RequestMapping注解
3、SpringCloud Feign报错：Method has too many Body parameters
错误日志如下：
Caused by: java.lang.IllegalStateException: Method has too many Body parameters: public abstract void com.hand.shop.order.service.api.OrderServiceApi.addOrder(com.hand.shop.pojo.Order,java.util.List)
at feign.Util.checkState(Util.java:128) ~[feign-core-9.5.1.jar:na]
at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:117) ~[feign-core-9.5.1.jar:na]
at org.springframework.cloud.openfeign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:133) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:66) ~[feign-core-9.5.1.jar:na]
at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:146) ~[feign-core-9.5.1.jar:na]
at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:53) ~[feign-core-9.5.1.jar:na]
at feign.Feign$Builder.target(Feign.java:218) ~[feign-core-9.5.1.jar:na]
at org.springframework.cloud.openfeign.HystrixTargeter.target(HystrixTargeter.java:39) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:223) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:244) ~[spring-cloud-openfeign-core-2.0.1.RELEASE.jar:2.0.1.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171) ~[spring-beans-5.0.10.RELEASE.jar:5.0.10.RELEASE]
... 30 common frames omitted
写Feign调用方法的时候可以有多个@RequestParam，但只能有不超过一个@RequestBody
4、SpringBoot项目使用Maven打包Test时失败
错误日志如下：
-------------------------------------------------------------------------------
Test set: com.hand.user.ShopServiceUserApplicationTests
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.909 s <<< FAILURE! - in com.hand.user.ShopServiceUserApplicationTests
initializationError(com.hand.user.ShopServiceUserApplicationTests) Time elapsed: 0.004 s <<< ERROR!
java.lang.IllegalStateException: Unable to find a @SpringBootConfiguration, you need to use @ContextConfiguration or @SpringBootTest(classes=...) with your test
原因：建好SpringBoot项目之后修改了主启动类的名字，需要在测试类上的@SpringBootTest注解指定主启动类
@RunWith(SpringRunner.class)
@SpringBootTest(classes = ShopServiceUser8080Application.class)
public class ShopServiceUser8080ApplicationTests {
@Test
public void contextLoads() {
}
}
5、EurekaClient自定义服务名称信息和访问路径可以显示IP地址
eureka:
client:
service-url:
defaultZone: ...
instance:
instance-id: shop-service-cart-8100 #自定义服务名称信息
prefer-ip-address: true #访问路径可以显示IP地址
6、解决Error resolving template template might not exist or might not be accessible问题
Thymeleaf + Spring Boot在开发环境正常，但用jar运行时报错Error resolving template template might not exist or might not be accessible
这个问题我们都很好明白，就是模板页不存在，但是实际上它能找到模板页，但是在使用th:include标签的时候才会出错，在引用模板文件的时候不用”/”打头