Существует код:
package com.example.sweater3.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Message {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String text;
private String tag;
public Message() {
}
public Message(String text, String tag) {
this.text = text;
this.tag = tag;
}
public void setText(String text) {
this.text = text;
}
public String getText() {
return text;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTag() {
return tag;
}
public void setTag(String tag) {
this.tag = tag;
}
}
_
package com.example.sweater3.repos;
import com.example.sweater3.domain.Message;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface MessageRepo extends CrudRepository<Message, Long> {
List<Message> findByTag(String tag);
}
__
package com.example.sweater3;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
__
package com.example.sweater3;
import com.example.sweater3.repos.MessageRepo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
@Controller
public class GreetingController {
@Autowired
private MessageRepo messageRepo;
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>sweater3</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mustache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>javax.persistence-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons</artifactId>
<version>2.1.9.RELEASE</version>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
При запуске программы вылетает такая ошибка:
:: Spring Boot :: (v2.0.0.RELEASE)
2019-10-30 21:28:05.351 INFO 4044 --- [ restartedMain] com.example.sweater3.Application : Starting Application on IlyaPC with PID 4044 (D:\EPAM\1Spring2019(04.19-09.19)\My\TEST\5October\30\sweater3\target\classes started by Ilya in D:\EPAM\1Spring2019(04.19-09.19)\My\TEST\5October\30\sweater3)
2019-10-30 21:28:05.354 INFO 4044 --- [ restartedMain] com.example.sweater3.Application : No active profile set, falling back to default profiles: default
2019-10-30 21:28:05.779 INFO 4044 --- [ restartedMain] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@7f8d5a6e: startup date [Wed Oct 30 21:28:05 MSK 2019]; root of context hierarchy
2019-10-30 21:28:10.905 INFO 4044 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2019-10-30 21:28:10.967 INFO 4044 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-10-30 21:28:10.968 INFO 4044 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.28
2019-10-30 21:28:10.985 INFO 4044 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk1.8.0_212\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\Java\jdk-12.0.1\bin\;C:\Program Files\Java\jdk1.8.0_212\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Git\cmd;C:\Program Files\nodejs\;C:\Program Files\Java\jre1.8.0_221\bin;C:\Users\Илья\AppData\Roaming\npm;.]
2019-10-30 21:28:11.243 INFO 4044 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-10-30 21:28:11.244 INFO 4044 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 5477 ms
2019-10-30 21:28:11.646 INFO 4044 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2019-10-30 21:28:11.656 INFO 4044 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-10-30 21:28:11.657 INFO 4044 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-10-30 21:28:11.657 INFO 4044 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-10-30 21:28:11.657 INFO 4044 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2019-10-30 21:28:11.741 WARN 4044 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'greetingController': Unsatisfied dependency expressed through field 'messageRepo'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.sweater3.repos.MessageRepo' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2019-10-30 21:28:11.745 INFO 4044 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-10-30 21:28:11.780 INFO 4044 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-10-30 21:28:12.257 ERROR 4044 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field messageRepo in com.example.sweater3.GreetingController required a bean of type 'com.example.sweater3.repos.MessageRepo' that could not be found.
Action:
Consider defining a bean of type 'com.example.sweater3.repos.MessageRepo' in your configuration.
Если я комментирую аннотацию @Autowired, все работает.
В чем проблема икак решить?
ps Код максимально упрощен, так как я удалил лишние фрагменты, чтобы они не мешали чтению кода, и не загроможу обзор.
upd:
Ответ на комментарии:
1. Adina Fometescu https://stackoverflow.com/a/58631848/11688668
после добавления появляется следующая ошибка -
2019-10-30 21:46:01.861 WARN 2716 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'inMemoryDatabaseShutdownExecutor' defined in class path resource [org/springframework/boot/devtools/autoconfigure/DevToolsDataSourceAutoConfiguration.class]: Unsatisfied dependency expressed through method 'inMemoryDatabaseShutdownExecutor' 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$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
2019-10-30 21:46:01.885 INFO 2716 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-10-30 21:46:01.943 INFO 2716 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-10-30 21:46:01.970 ERROR 2716 --- [ restartedMain] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).