java - 在 spring boot + react + mysql 连接器上构建失败？

Question

我目前正在 spring boot + react(自动加载)+ mysql 数据库上创建一个项目，但是一旦我尝试创建像 this tuto 这样的后端, 我得到这个错误

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.NoSuchBeanDefinitionException: No qualifying bean of type javax.sql.DataSource' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}

我的 pom.xml 是:

<?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.gmed</groupId>
<artifactId>starter</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>Spring Boot and React starter</name>
<description>Spring Boot and React starter</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.7.RELEASE</version><!-- 1.3.3.RELEASE for the last stable release -->
    <relativePath /> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <java.version>1.8</java.version>
    <orika-core.version>1.4.6</orika-core.version>
    <assertj-core.version>3.2.0</assertj-core.version>
    <lombok.version>1.16.6</lombok.version>
    <cobertura-plugin.version>2.7</cobertura-plugin.version>
    <coveralls-plugin.version>4.0.0</coveralls-plugin.version>
    <frontend-plugin.version>0.0.27</frontend-plugin.version>
    <node.version>v5.7.0</node.version>
    <npm.version>3.7.1</npm.version>
</properties>

<dependencies>
    <!-- Spring Boot Starters -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <exclusions>
            <exclusion>
                <!-- We use HikariCP instead -->
                <groupId>org.apache.tomcat</groupId>
                <artifactId>tomcat-jdbc</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

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


    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>


    <!-- Database -->
    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
    </dependency>
    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
    </dependency>
    <!-- For MySQL -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.6</version>
    </dependency>
    <!-- Other -->
    <dependency>
    <groupId>org.springframework.security</groupId>
    <artifactId>spring-security-web</artifactId>

</dependency>
<dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-entitymanager</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-validator</artifactId>
    </dependency>



    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>

    </dependency>

    <dependency>
        <groupId>ma.glasnost.orika</groupId>
        <artifactId>orika-core</artifactId>
        <version>${orika-core.version}</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.assertj</groupId>
        <artifactId>assertj-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-jpamodelgen</artifactId>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <!-- Cobertura -->
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>cobertura-maven-plugin</artifactId>
            <version>${cobertura-plugin.version}</version>
            <configuration>
                <format>xml</format>
                <maxmem>256m</maxmem>
                <aggregate>true</aggregate>
                <instrumentation>
                    <!-- Exclude JPA meta-model generated classes -->
                    <ignores>
                        <ignore>**/*_.java</ignore>
                    </ignores>
                    <excludes>
                        <exclude>**/*_.class</exclude>
                    </excludes>
                </instrumentation>
                <check/>
            </configuration>
        </plugin>
        <!-- Coveralls -->
        <plugin>
            <groupId>org.eluder.coveralls</groupId>
            <artifactId>coveralls-maven-plugin</artifactId>
            <version>${coveralls-plugin.version}</version>
            <configuration>
                <repoToken>your coveralls repository token goes here</repoToken>
            </configuration>
        </plugin>
        <!-- Frontend -->
        <!-- Frontend -->
        <plugin>
            <groupId>com.github.eirslett</groupId>
            <artifactId>frontend-maven-plugin</artifactId>
            <version>${frontend-plugin.version}</version>
            <configuration>
                <workingDirectory>src/main/frontend</workingDirectory>
                <nodeDownloadRoot>https://nodejs.org/dist/</nodeDownloadRoot>
                <nodeVersion>${node.version}</nodeVersion>
                <npmVersion>${npm.version}</npmVersion>
                <installDirectory>target</installDirectory>
            </configuration>
            <executions>
                <execution>
                    <id>install node and npm</id>
                    <goals>
                        <goal>install-node-and-npm</goal>
                    </goals>
                    <phase>generate-resources</phase>
                </execution>
                <execution>
                    <id>npm install</id>
                    <goals>
                        <goal>npm</goal>
                    </goals>
                    <configuration>
                        <arguments>install</arguments>
                        <installDirectory>target</installDirectory>
                    </configuration>
                </execution>
                <execution>
                    <id>webpack build</id>
                    <goals>
                        <goal>webpack</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
<!-- Repositories only needed if using a milestone or snapshot -->
<repositories>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </pluginRepository>
    <pluginRepository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
        <snapshots>
            <enabled>false</enabled>
        </snapshots>
    </pluginRepository>
</pluginRepositories>

</project>

我尝试了网上所有的解决方案。

谢谢

Answer 1

如果 Spring 找不到用于构建数据源的数据源参数，它将生成该错误消息。这些参数来自您的 application.properties(基于您链接到的教程)。最可能的原因是它没有加载 application.properties。

如果不显示您的任何代码，就不可能给出更详细的答案。