创建一个使用Spring Boot的REST API。

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英文:

Create a REST API with Spring Boot

问题

我在Spring中创建了一个餐厅预订应用程序,但当我以Java应用程序的形式运行它时,它显示如下错误信息:

无法配置数据源:未指定 'url' 属性,且无法配置嵌入式数据源。
原因:无法确定适当的驱动程序类

使用的_pom.xml_文件如下:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.4.0-SNAPSHOT</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.codebydarko</groupId>
	<artifactId>reservation-microservice</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>reservation-microservice</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>14</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
				<executable>true</executable>
				</configuration>
			</plugin>
		</plugins>
	</build>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
		</repository>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
	</repositories>
	<pluginRepositories>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
		</pluginRepository>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>
</project>

Spring Boot应用程序代码如下:

package com.codebydarko;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ReservationMicroserviceApplication {

	public static void main(String[] args) {
		SpringApplication.run(ReservationMicroserviceApplication.class, args);
	}

}
英文:

I have created a a restaurant reservation application in Spring but when I run as Java Application its says:

> Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class

The pom.xml file being used:

&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;project xmlns=&quot;http://maven.apache.org/POM/4.0.0&quot; xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
xsi:schemaLocation=&quot;http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd&quot;&gt;
&lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
&lt;parent&gt;
&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
&lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt;
&lt;version&gt;2.4.0-SNAPSHOT&lt;/version&gt;
&lt;relativePath/&gt; &lt;!-- lookup parent from repository --&gt;
&lt;/parent&gt;
&lt;groupId&gt;com.codebydarko&lt;/groupId&gt;
&lt;artifactId&gt;reservation-microservice&lt;/artifactId&gt;
&lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;
&lt;name&gt;reservation-microservice&lt;/name&gt;
&lt;description&gt;Demo project for Spring Boot&lt;/description&gt;
&lt;properties&gt;
&lt;java.version&gt;14&lt;/java.version&gt;
&lt;/properties&gt;
&lt;dependencies&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
&lt;artifactId&gt;spring-boot-starter-data-jpa&lt;/artifactId&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
&lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
&lt;artifactId&gt;spring-boot-devtools&lt;/artifactId&gt;
&lt;scope&gt;runtime&lt;/scope&gt;
&lt;optional&gt;true&lt;/optional&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;mysql&lt;/groupId&gt;
&lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt;
&lt;scope&gt;runtime&lt;/scope&gt;
&lt;/dependency&gt;
&lt;dependency&gt;
&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
&lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;
&lt;scope&gt;test&lt;/scope&gt;
&lt;/dependency&gt;
&lt;/dependencies&gt;
&lt;build&gt;
&lt;plugins&gt;
&lt;plugin&gt;
&lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
&lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt; 
&lt;configuration&gt;
&lt;executable&gt;true&lt;/executable&gt;
&lt;/configuration&gt;
&lt;/plugin&gt;
&lt;/plugins&gt;
&lt;/build&gt;
&lt;repositories&gt;
&lt;repository&gt;
&lt;id&gt;spring-milestones&lt;/id&gt;
&lt;name&gt;Spring Milestones&lt;/name&gt;
&lt;url&gt;https://repo.spring.io/milestone&lt;/url&gt;
&lt;/repository&gt;
&lt;repository&gt;
&lt;id&gt;spring-snapshots&lt;/id&gt;
&lt;name&gt;Spring Snapshots&lt;/name&gt;
&lt;url&gt;https://repo.spring.io/snapshot&lt;/url&gt;
&lt;snapshots&gt;
&lt;enabled&gt;true&lt;/enabled&gt;
&lt;/snapshots&gt;
&lt;/repository&gt;
&lt;/repositories&gt;
&lt;pluginRepositories&gt;
&lt;pluginRepository&gt;
&lt;id&gt;spring-milestones&lt;/id&gt;
&lt;name&gt;Spring Milestones&lt;/name&gt;
&lt;url&gt;https://repo.spring.io/milestone&lt;/url&gt;
&lt;/pluginRepository&gt;
&lt;pluginRepository&gt;
&lt;id&gt;spring-snapshots&lt;/id&gt;
&lt;name&gt;Spring Snapshots&lt;/name&gt;
&lt;url&gt;https://repo.spring.io/snapshot&lt;/url&gt;
&lt;snapshots&gt;
&lt;enabled&gt;true&lt;/enabled&gt;
&lt;/snapshots&gt;
&lt;/pluginRepository&gt;
&lt;/pluginRepositories&gt;
&lt;/project&gt;

The Spring Boot application:

package com.codebydarko;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ReservationMicroserviceApplication {
public static void main(String[] args) {
SpringApplication.run(ReservationMicroserviceApplication.class, args);
}
}

答案1

得分: 2

当你在Maven文件中添加了spring-boot-starter-data-jpa依赖时,Spring会在application.properties文件中搜索spring.datasource.url配置项。你需要在application.properties文件中定义它。

英文:

When you add this dependency spring-boot-starter-data-jpa in your maven file spring searches for spring.datasource.url config in application.properties file.

You need to define it in application.properties

huangapple
  • 本文由 发表于 2020年7月22日 20:45:55
  • 转载请务必保留本文链接:https://go.coder-hub.com/63034535.html
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