我在github https://github.com/felloz/personsService中提供了此服务，应用程序编译没有错误，但是当我尝试访问路由http://localhost:8080/demo/persons时，我收到此错误：
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Mon May 11 14:55:30 VET 2020
There was an unexpected error (type=Not Found, status=404).
No message available
编译消息：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.7.RELEASE)
2020-05-11 15:05:55.576 INFO 10476 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication on lserrano-PC with PID 10476 (C:\JAVA\Eclipse Projects\demo\target\classes started by lserrano in C:\JAVA\Eclipse Projects\demo)
2020-05-11 15:05:55.592 INFO 10476 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2020-05-11 15:05:58.173 INFO 10476 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-05-11 15:05:58.198 INFO 10476 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-05-11 15:05:58.198 INFO 10476 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.34]
2020-05-11 15:05:58.386 INFO 10476 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-05-11 15:05:58.387 INFO 10476 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2685 ms
2020-05-11 15:05:58.857 INFO 10476 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
2020-05-11 15:05:59.362 INFO 10476 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-05-11 15:05:59.377 INFO 10476 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 4.578 seconds (JVM running for 5.433)
2020-05-11 15:06:14.712 INFO 10476 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-05-11 15:06:14.712 INFO 10476 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-05-11 15:06:14.727 INFO 10476 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 15 ms
您可以在github存储库中检查代码，即使用NetBeans作为IDE，Sprong的新功能将不胜感激。
添加server.servlet.context-path = / demo
之后
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.2.7.RELEASE)
2020-05-11 17:26:54.336 INFO 9144 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication on lserrano-PC with PID 9144 (C:\JAVA\Eclipse Projects\demo\target\classes started by lserrano in C:\JAVA\Eclipse Projects\demo)
2020-05-11 17:26:54.336 INFO 9144 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2020-05-11 17:26:56.926 INFO 9144 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-05-11 17:26:56.957 INFO 9144 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-05-11 17:26:56.957 INFO 9144 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.34]
2020-05-11 17:26:57.160 INFO 9144 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/demo] : Initializing Spring embedded WebApplicationContext
2020-05-11 17:26:57.160 INFO 9144 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2715 ms
2020-05-11 17:26:57.612 INFO 9144 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
2020-05-11 17:26:58.111 INFO 9144 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path '/demo'
2020-05-11 17:26:58.111 INFO 9144 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 4.591 seconds (JVM running for 5.464)
2020-05-11 17:27:14.361 INFO 9144 --- [nio-8080-exec-2] o.a.c.c.C.[Tomcat].[localhost].[/demo] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-05-11 17:27:14.362 INFO 9144 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-05-11 17:27:14.379 INFO 9144 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet : Completed initialization in 17 ms
答案 0 :(得分：1)
您的控制器中有@RequestMapping({"/persons"})，因此请尝试使用不http://localhost:8080/persons的链接demo
答案 1 :(得分：1)
答案 2 :(得分：1)
如果您不想使用Jpa，则需要进行以下更改：
Context Path应该设置为：
server.servlet.context-path=/demo
DemoApplication类（更正基本包）：
@SpringBootApplication
@ComponentScan(basePackages = {"com.example"})
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
您需要为Repositoory提供实施：
import java.util.ArrayList;
import java.util.List;
import org.springframework.stereotype.Repository;
@Repository
public class PersonRepository{
public List<Person> findAll(){
List<Person> list = new ArrayList<>();
Person person = new Person();
person.setId(10001);
person.setName("Name");
person.setLastname("LastName");
list.add(person);
return list;
}
}
要使用MySQL DB和SpringBoot，可以在Web上找到许多示例。请遵循。范例：SpringBootMySQLExample