Java 添加Jpa maven依赖项后无法运行spring启动应用程序
我在heroku的基础上启动了一个spring boot应用程序 我正在运行postgres docker容器,应用程序可以正确连接到该容器。现在我想使用Hibernate(如下所示,但在添加Jpa依赖项时:Java 添加Jpa maven依赖项后无法运行spring启动应用程序,java,spring,hibernate,maven,Java,Spring,Hibernate,Maven,我在heroku的基础上启动了一个spring boot应用程序 我正在运行postgres docker容器,应用程序可以正确连接到该容器。现在我想使用Hibernate(如下所示,但在添加Jpa依赖项时: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId&
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
我不理解这个错误,也找不到太多关于它的信息(或者我不理解)。有人建议我检查配置,尽管我不确定我会错过什么
以下是项目中的一些文件:
应用程序属性
########## Original config (Heroku template)
spring.datasource.url: jdbc:postgresql://localhost:5432/postgres?user=postgres&password=postgres
spring.datasource.hikari.connection-timeout=30000
spring.datasource.hikari.maximum-pool-size=10
spring.thymeleaf.mode=HTML
logging.level.org.springframework=INFO
spring.profiles.active=production
server.port=${PORT:5000}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://maven.apache.org/POM/4.0.0"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>java-getting-started</artifactId>
<version>1.0</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.0.RELEASE</version>
<relativePath/>
</parent>
<name>java-getting-started</name>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<webjars-bootstrap.version>4.1.3</webjars-bootstrap.version>
<webjars-jquery-ui.version>1.12.1</webjars-jquery-ui.version>
<webjars-jquery.version>3.3.1-1</webjars-jquery.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<exclusions>
<exclusion>
<groupId>nz.net.ultraq.thymeleaf</groupId>
<artifactId>thymeleaf-layout-dialect</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
</dependency>
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>${webjars-jquery.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery-ui</artifactId>
<version>${webjars-jquery-ui.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>${webjars-bootstrap.version}</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>webjars-locator</artifactId>
<version>0.30</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<!-- additional dependencies -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.1</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>build-info</goal>
</goals>
<configuration>
<additionalProperties>
<encoding.source>${project.build.sourceEncoding}</encoding.source>
<encoding.reporting>${project.reporting.outputEncoding}</encoding.reporting>
<java.source>${maven.compiler.source}</java.source>
<java.target>${maven.compiler.target}</java.target>
</additionalProperties>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
UserService.java
package com.example;
@Controller
@SpringBootApplication
public class Main {
@Autowired
private UserService userService;
public static void main(String[] args) throws Exception {
SpringApplication.run(Main.class, args);
}
@GetMapping(value = "/listUsers")
@ResponseBody
public String listUsers() {
User user = this.userService.listUsers().stream().findFirst().orElse(null);
return user != null ? user.getName() : "No user";
}
}
@Service
public class UserService {
@Autowired
private DbService dbService;
public List<User> listUsers() {
StringBuilder fetchQuery = new StringBuilder();
fetchQuery.append("SELECT * FROM user");
System.out.println("Fetching with query : " + fetchQuery.toString());
List<User> users = this.dbService.fetchUsers(fetchQuery.toString());
return users;
}
}
也许你应该再次查看Heroku教程。它说你必须在你的应用程序中添加一个配置bean!这意味着你至少需要一个带有@configuration的类。教程中的配置bean如下所示:
package com.example.demo;
import com.zaxxer.hikari.*;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.*;
import javax.sql.DataSource;
@Configuration
public class DatabaseConfig {
@Value("${spring.datasource.url}")
private String dbUrl;
@Bean
public DataSource dataSource() {
HikariConfig config = new HikariConfig();
config.setJdbcUrl(dbUrl);
return new HikariDataSource(config);
}
}
也许你应该再次查看Heroku教程。它说你必须在你的应用程序中添加一个配置bean!这意味着你至少需要一个带有@configuration的类。教程中的配置bean如下所示:
package com.example.demo;
import com.zaxxer.hikari.*;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.*;
import javax.sql.DataSource;
@Configuration
public class DatabaseConfig {
@Value("${spring.datasource.url}")
private String dbUrl;
@Bean
public DataSource dataSource() {
HikariConfig config = new HikariConfig();
config.setJdbcUrl(dbUrl);
return new HikariDataSource(config);
}
}
@JavaConfig将配置注释类用作bean定义的源。您需要创建配置类并在其中提供方法dataSource(),以创建bean
@Configuration
public class DatabaseConfig {
@Value("${spring.datasource.url}")
private String dbUrl;
@Bean
public DataSource dataSource() throws SQLException {
if (dbUrl == null || dbUrl.isEmpty()) {
return new HikariDataSource();
} else {
HikariConfig config = new HikariConfig();
config.setJdbcUrl(dbUrl);
return new HikariDataSource(config);
}
}
}
有关更多信息,请参见@配置注释类被JavaConfig用作bean定义的源。您需要创建配置类并在其中提供方法dataSource(),以创建bean
@Configuration
public class DatabaseConfig {
@Value("${spring.datasource.url}")
private String dbUrl;
@Bean
public DataSource dataSource() throws SQLException {
if (dbUrl == null || dbUrl.isEmpty()) {
return new HikariDataSource();
} else {
HikariConfig config = new HikariConfig();
config.setJdbcUrl(dbUrl);
return new HikariDataSource(config);
}
}
}
有关更多信息,请参见能否提供更多错误日志?@Giorgi Tsiklauri添加了完整堆栈跟踪(由于堆栈溢出限制,部分行被裁剪)你能为
UserService添加代码吗?
@SSK我已经添加了UserService类。现在请添加DbService
类。一些依赖项无法解决。你能提供更多错误日志吗?@Giorgi Tsiklauri添加了完整堆栈跟踪(由于堆栈溢出限制,剪切了一些行)你能为UserService添加代码吗?
@SSK我已经添加了UserService类现在请添加DbService
类。一些依赖项无法解决..bean在DbService.java
类中,这样可以吗?如果bean放在另一个单独的配置类中,我不知道有什么区别请检查t他的一个,然后bean在DbService.java
类中,这样可以吗?我不知道如果bean放在另一个单独的配置类中会有什么区别检查这个类,那么您也可以在非配置类中使用@bean
(尽管不推荐),它附带can CEVEAT(又名bean mode lite)。您也可以在非配置类中使用@Bean
(尽管不推荐),并且它附带can CEVEAT(又名Bean mode lite)。
@Configuration
public class DatabaseConfig {
@Value("${spring.datasource.url}")
private String dbUrl;
@Bean
public DataSource dataSource() throws SQLException {
if (dbUrl == null || dbUrl.isEmpty()) {
return new HikariDataSource();
} else {
HikariConfig config = new HikariConfig();
config.setJdbcUrl(dbUrl);
return new HikariDataSource(config);
}
}
}