在开发Spring引导期间，REST端点会遇到应用程序的奇怪（heisenbug）行为。同样可能与我为每个端点项目制作单独的模块相关。详细说来，它可以运行一次但在重新运行后失败，可能会运行一个端点而不是另一个端点，反之亦然。
说明
无法确定数据库类型为NONE的嵌入式数据库驱动程序类
动作：
如果您想要一个嵌入式数据库，请将支持的数据库放在 类路径。如果您要从a加载数据库设置 您可能需要激活它的特定配置文件（没有配置文件 目前有效。）
我的gradle配置：
buildscript {
ext {
springBootVersion = '1.5.6.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
// compile('org.springframework.boot:spring-boot-starter-actuator')
compile('org.springframework.boot:spring-boot-starter-data-rest')
compile('org.springframework.boot:spring-boot-starter-data-jpa')
compile('org.springframework.boot:spring-boot-starter-hateoas')
compile('org.springframework.boot:spring-boot-starter-web')
runtime('mysql:mysql-connector-java')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
和application.propperties
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect
spring.jpa.generate-ddl=true
spring.jpa.show-sql=true
spring.datasource.url = jdbc:mysql://localhost:3306/customers?useSSL=false
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username = root
spring.datasource.password = root
server.port=8090
我的回购：
@RepositoryRestResource(collectionResourceRel = "customers", path = "customers ")
public interface CustomerRepository extends PagingAndSortingRepository<Customer, Long> {
List<Customer> findByName(@Param("name") String name);
@Override
@RestResource(exported = false)
void delete(Long id);
@Override
@RestResource(exported = false)
void delete(Customer entity);
}
我的主要人物：
@SpringBootApplication
public class CustomerApplication {
public static void main(String[] args) {
SpringApplication.run(CustomerApplication.class, args);
}
}
错误堆栈跟踪：
2017-08-25 11:51:03.316 INFO 14116 --- [ main] c.b.e.s.p.product.ProductApplication : Starting ProductApplication on PF0MQ6SH with PID 14116 (C:\Users\yevhen.shymko\IdeaProjects\shop\product\out\production\classes started by yevhen.shymko in C:\Users\yevhen.shymko\IdeaProjects\shop)
2017-08-25 11:51:03.321 INFO 14116 --- [ main] c.b.e.s.p.product.ProductApplication : No active profile set, falling back to default profiles: default
2017-08-25 11:51:03.420 INFO 14116 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@15bb6bea: startup date [Fri Aug 25 11:51:03 CEST 2017]; root of context hierarchy
2017-08-25 11:51:05.007 INFO 14116 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'httpRequestHandlerAdapter' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration; factoryMethodName=httpRequestHandlerAdapter; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration; factoryMethodName=httpRequestHandlerAdapter; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]]
2017-08-25 11:51:05.068 INFO 14116 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'managementServletContext' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.actuate.autoconfigure.EndpointWebMvcHypermediaManagementContextConfiguration; factoryMethodName=managementServletContext; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcHypermediaManagementContextConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.actuate.autoconfigure.EndpointWebMvcAutoConfiguration; factoryMethodName=managementServletContext; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/actuate/autoconfigure/EndpointWebMvcAutoConfiguration.class]]
2017-08-25 11:51:05.696 INFO 14116 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$e6633d19] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2017-08-25 11:51:06.165 INFO 14116 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-08-25 11:51:06.179 INFO 14116 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-08-25 11:51:06.180 INFO 14116 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.16
2017-08-25 11:51:06.600 INFO 14116 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-08-25 11:51:06.600 INFO 14116 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3184 ms
2017-08-25 11:51:07.259 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-08-25 11:51:07.272 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'metricsFilter' to: [/*]
2017-08-25 11:51:07.273 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-08-25 11:51:07.273 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-08-25 11:51:07.273 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-08-25 11:51:07.274 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-08-25 11:51:07.274 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'webRequestLoggingFilter' to: [/*]
2017-08-25 11:51:07.274 INFO 14116 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'applicationContextIdFilter' to: [/*]
2017-08-25 11:51:07.445 WARN 14116 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
2017-08-25 11:51:07.449 INFO 14116 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2017-08-25 11:51:07.501 INFO 14116 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-08-25 11:51:07.519 ERROR 14116 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Cannot determine embedded database driver class for database type NONE
Action:
If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (no profiles are currently active).
Process finished with exit code 1
答案 0 :(得分：-1)
解决方案很奇怪 - 在一些更改后手动刷新gradle项目。