我有一个非常简单的情况，我现在尝试了一些事情，但我找不到这个问题的原因。它声称它不能自动装配Feign客户端类，尽管这是我在Spring Boot 1.5.9中完成此操作的方法。至少我很确定。虽然我嘲笑这个客户端，但我的所有单元测试都能正常工作。以前它是导入库的一部分但是为了消除我没有正确定位bean的可能性我只是将它添加到同一个项目中。
我不是最有经验的春天或假期，所以我想知道我在这里失踪的是否显而易见。
简单假装客户：
@FeignClient(name = "my-other-service")
public interface OtherServiceClient {
@GetMapping(value = "/foo/{fooId}")
@ResponseBody
String getFoo(@PathVariable int fooId);
}
主要应用类： @SpringBootApplication @EnableDiscoveryClient @EnableFeignClients //在其他模块中有组件扫描 公共类MyServiceApplication {
public static void main(String[] args) {
SpringApplication.run(MyServiceApplication.class, args);
}
}
取决于假装客户的服务：
@Service
public class FooService {
private final FooRepository fooRepository;
private final BarRepository barRepository;
private OtherServiceClient otherServiceClient;
@Autowired
public OrderService(
FooRepository fooRepository,
BarRepository barRepository,
OtherServiceClient otherServiceClient) {
this.fooRepository= fooRepository;
this.barRepository = barRepository;
this.otherServiceClient = otherServiceClient;
}
由于它可能是自动配置，因此配置报告是：
============================
CONDITIONS EVALUATION REPORT
============================
Positive matches:
-----------------
ConfigServiceBootstrapConfiguration#configServicePropertySource matched:
- @ConditionalOnProperty (spring.cloud.config.enabled) matched (OnPropertyCondition)
- @ConditionalOnMissingBean (types: org.springframework.cloud.config.client.ConfigServicePropertySourceLocator; SearchStrategy: all) did not find any beans (OnBeanCondition)
ConfigurationPropertiesRebinderAutoConfiguration matched:
- @ConditionalOnBean (types: org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor; SearchStrategy: all) found bean 'org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor' (OnBeanCondition)
ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesBeans matched:
- @ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesBeans; SearchStrategy: current) did not find any beans (OnBeanCondition)
ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesRebinder matched:
- @ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesRebinder; SearchStrategy: current) did not find any beans (OnBeanCondition)
EncryptionBootstrapConfiguration matched:
- @ConditionalOnClass found required class 'org.springframework.security.crypto.encrypt.TextEncryptor'; @ConditionalOnMissingClass did not find unwanted class (OnClassCondition)
PropertyPlaceholderAutoConfiguration#propertySourcesPlaceholderConfigurer matched:
- @ConditionalOnMissingBean (types: org.springframework.context.support.PropertySourcesPlaceholderConfigurer; SearchStrategy: current) did not find any beans (OnBeanCondition)
Negative matches:
-----------------
ConfigServiceBootstrapConfiguration.RetryConfiguration:
Did not match:
- @ConditionalOnClass did not find required class 'org.springframework.retry.annotation.Retryable' (OnClassCondition)
DiscoveryClientConfigServiceBootstrapConfiguration:
Did not match:
- @ConditionalOnProperty (spring.cloud.config.discovery.enabled) did not find property 'spring.cloud.config.discovery.enabled' (OnPropertyCondition)
EncryptionBootstrapConfiguration.RsaEncryptionConfiguration:
Did not match:
- Keystore nor key found in Environment (EncryptionBootstrapConfiguration.KeyCondition)
Matched:
- @ConditionalOnClass found required class 'org.springframework.security.rsa.crypto.RsaSecretEncryptor'; @ConditionalOnMissingClass did not find unwanted class (OnClassCondition)
EncryptionBootstrapConfiguration.VanillaEncryptionConfiguration:
Did not match:
- @ConditionalOnMissingClass found unwanted class 'org.springframework.security.rsa.crypto.RsaSecretEncryptor' (OnClassCondition)
EurekaDiscoveryClientConfigServiceBootstrapConfiguration:
Did not match:
- @ConditionalOnProperty (spring.cloud.config.discovery.enabled) did not find property 'spring.cloud.config.discovery.enabled' (OnPropertyCondition)
Matched:
- @ConditionalOnClass found required class 'org.springframework.cloud.config.client.ConfigServicePropertySourceLocator'; @ConditionalOnMissingClass did not find unwanted class (OnClassCondition)
pom的相关部分......我正在使用Maven。
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.BUILD-SNAPSHOT</spring-cloud.version>
<spring-restdocs.version>2.0.0.RELEASE</spring-restdocs.version>
<snippetsDirectory>${project.build.directory}/generated-snippets</snippetsDirectory>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-oauth2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jdk8</artifactId>
<version>2.9.4</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>2.4.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.restdocs</groupId>
<artifactId>spring-restdocs-mockmvc</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
从一些不太相关的数据中删除堆栈跟踪...
2018-03-21 15:07:20.481 INFO 26756 --- [ restartedMain] org.hibernate.Version : HHH000412: Hibernate Core {5.2.14.Final}
2018-03-21 15:07:20.483 INFO 26756 --- [ restartedMain] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-03-21 15:07:20.539 INFO 26756 --- [ restartedMain] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-03-21 15:07:20.930 INFO 26756 --- [ restartedMain] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.Oracle10gDialect
2018-03-21 15:07:21.445 INFO 26756 --- [ restartedMain] o.h.e.j.e.i.LobCreatorBuilderImpl : HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl.useContextualLobCreation(LobCreatorBuilderImpl.java:113) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl.makeLobCreatorBuilder(LobCreatorBuilderImpl.java:54) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentImpl.<init>(JdbcEnvironmentImpl.java:271) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at ...
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:242) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:861) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:888) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57) [spring-orm-5.0.4.RELEASE.jar:5.0.4.RELEASE]
.
.
.
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:388) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1234) ~[spring-boot-2.0.0.RELEASE.jar:2.0.0.RELEASE]
at com.myservice.EqOrderServiceApplication.main(EqOrderServiceApplication.java:14) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.0.0.RELEASE.jar:2.0.0.RELEASE]
Caused by: java.lang.AbstractMethodError: oracle.jdbc.driver.T4CConnection.createClob()Ljava/sql/Clob;
... 49 common frames omitted
2018-03-21 15:07:22.361 INFO 26756 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-03-21 15:07:23.295 INFO 26756 --- [ restartedMain] s.c.a.AnnotationConfigApplicationContext : Refreshing FeignContext-dbe-order-detail: startup date [Wed Mar 21 15:07:23 EDT 2018]; parent: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@1290d90c
2018-03-21 15:07:23.316 INFO 26756 --- [ restartedMain] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2018-03-21 15:07:24.048 WARN 26756 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mainController' defined in file [<my path>\controller\MainController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService' defined in file [<my path>\service\OrderService.class]: Unsatisfied dependency expressed through constructor parameter 2; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.myservice.OtherServiceClient ': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: PathVariable annotation was empty on param 0.
2018-03-21 15:07:24.049 INFO 26756 --- [ restartedMain] s.c.a.AnnotationConfigApplicationContext : Closing FeignContext-dbe-order-detail: startup date [Wed Mar 21 15:07:23 EDT 2018]; parent: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@1290d90c
2018-03-21 15:07:24.051 INFO 26756 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2018-03-21 15:07:24.053 WARN 26756 --- [ restartedMain] o.s.b.f.support.DisposableBeanAdapter : Invocation of destroy method 'close' failed on bean with name 'eurekaRegistration': org.springframework.beans.factory.BeanCreationNotAllowedException: Error creating bean with name 'org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration': Singleton bean creation not allowed while singletons of this factory are in destruction (Do not request a bean from a BeanFactory in a destroy method implementation!)
2018-03-21 15:07:24.055 INFO 26756 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-03-21 15:07:24.077 INFO 26756 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-03-21 15:07:24.091 ERROR 26756 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mainController' defined in file [<my path>\controller\MainController.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService' defined in file [<my path>\service\OrderService.class]: Unsatisfied dependency expressed through constructor parameter 2; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.myservice.OtherServiceClient ': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: PathVariable annotation was empty on param 0.
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:729) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:192) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1270) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
.
.
.
at com.myservice.MyServiceApplication.main(MyServiceApplication.java:14) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_162]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_162]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_162]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.0.RELEASE.jar:2.0.0.RELEASE]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'orderService' defined in file [<my path>\service\OrderService.class]: Unsatisfied dependency expressed through constructor parameter 2; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.myservice.OtherServiceClient ': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: PathVariable annotation was empty on param 0.
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:729) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:192) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1270) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
.
.
.
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:815) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:721) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
... 24 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.myservice.OtherServiceClient ': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: PathVariable annotation was empty on param 0.
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1645) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1178) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:258) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1325) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1291) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:815) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:721) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
... 38 common frames omitted
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-2.0.0.BUILD-20180321.114528-231.jar:2.0.0.BUILD-SNAPSHOT]
at org.springframework.cloud.openfeign.support.SpringMvcContract.processAnnotationsOnParameter(SpringMvcContract.java:238) ~[spring-cloud-openfeign-core-2.0.0.BUILD-20180321.114528-231.jar:2.0.0.BUILD-SNAPSHOT]
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-2.0.0.BUILD-20180321.114528-231.jar:2.0.0.BUILD-SNAPSHOT]
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-2.0.0.BUILD-20180321.114528-231.jar:2.0.0.BUILD-SNAPSHOT]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:223) ~[spring-cloud-openfeign-core-2.0.0.BUILD-20180321.114528-231.jar:2.0.0.BUILD-SNAPSHOT]
at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:244) ~[spring-cloud-openfeign-core-2.0.0.BUILD-20180321.114528-231.jar:2.0.0.BUILD-SNAPSHOT]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:161) ~[spring-beans-5.0.4.RELEASE.jar:5.0.4.RELEASE]
... 50 common frames omitted
Disconnected from the target VM, address: '127.0.0.1:50881', transport: 'socket'
Process finished with exit code 0
我在这一点上很难过。
编辑：
更新，因此，为了进行更多调查，因为我确信服务在开始Feign工作之前就开始了，我注释掉了对feign客户端和feign客户端本身的所有引用，除了应用程序类的配置注释。我仍然在启动时看到对数据库驱动程序的引用，但应用程序确实运行了。这是我在启动时看到的例外，但没有Feign交互，应用程序就会启动。
2018-03-21 17:04:56.222 INFO 27424 --- [ restartedMain] o.h.e.j.e.i.LobCreatorBuilderImpl : HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException: null
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_162]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:259) [hibernate-core-5.2.14.Final.jar:5.2.14.Final]
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:210）[hibernate-core-5.2.14.Final.jar：5.2.14.Final] 在org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure（JdbcServicesImpl.java:51）[hibernate-core-5.2.14.Final.jar：5.2.14.Final] at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:94）[hibernate-core-5.2.14.Final.jar：5.2.14.Final]
Caused by: java.lang.AbstractMethodError: oracle.jdbc.driver.T4CConnection.createClob()Ljava/sql/Clob;
... 49 common frames omitted
数据库驱动程序位于较旧的一侧，因此我可能会看到将其更新为ojdbc8驱动程序，可能是因为我正在使用它...
答案 0 :(得分：4)
之前假装客户端存在问题。我猜您遇到的情况可能相同，因为您使用的是旧版本，但您应该做的是在@PathVariable注释中包含pathVariable名称，如CanvasFragment
您可以在here
中找到详细信息答案 1 :(得分：2)
当您使用rest feign客户服务时，我们需要定义确切的@Pathvariable名称。
@GetMapping("/hello-world/from/{from}/to/{to}")
public String getHelloWorld(@PathVariable("from") String from, @PathVariable ("to") String to);
答案 2 :(得分：0)
我对@pathvariable 有同样的问题，当我添加 @PathVariable 的 value 属性时解决了，如下所示，
@PathVariable(value = "from") String from,
@PathVariable(value = "to") String to);
答案 3 :(得分：-1)
@GetMapping(value = "/foo/{fooId}")
@ResponseBody
String getFoo(@PathVariable(value="fooId") int fooId);
会做