春季启动错误org.springframework.beans.factory.BeanCreationException数据源

【问题标题】：spring boot error org.springframework.beans.factory.BeanCreationException datasource春季启动错误org.springframework.beans.factory.BeanCreationException数据源
【发布时间】：2018-09-20 15:14:24
【问题描述】：

我正在使用 spring boot 和我的 sql。我收到以下错误。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1277) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1265) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
at com.bookstores.BookstoresApplication.main(BookstoresApplication.java:17) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    ... 18 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot load driver class: com.mysql.jdbc.Driver
    at org.springframework.util.Assert.state(Assert.java:94) ~[spring-core-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSour``ceProperties.java:224) ~[spring-boot-autoconfigure-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder(DataSourceProperties.java:176) ~[spring-boot-autoconfigure-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:43) ~[spring-boot-autoconfigure-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:83) ~[spring-boot-autoconfigure-2.0.5.RELEASE.jar:2.0.5.RELEASE]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_181]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_181]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_181]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
    ... 19 common frames omitted

我的代码是

    server.port=8181
spring.thymeleaf.cache=false

# create and drop tables and sequences, loads import.sql
#spring.jpa.hibernate.ddl-auto=update

# Oracle settings
spring.datasource.url=jdbc:mysql://localhost:3306/bookstore
spring.datasource.username=root
spring.datasource.password=oracle
#spring.datasource.driver.class=oracle.jdbc.driver.OracleDriver
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#spring.datasource.type=oracle.jdbc.pool.OracleDataSource
#spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

#spring.datasource.tomcat.test-while-idle=true
#spring.datasource.tomcat.validation-query= SELECT 1

spring.jpa.show-sql=true

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.bookstore</groupId>
    <artifactId>bookstore</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>bookstore</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

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




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

        <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        </dependency>



    <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>

        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

【问题讨论】：

  • 欢迎来到 Stackoverflow。请编辑您的问题以澄清您的问题。目前，您主要是转储了您的代码，并没有说明您在做什么。这种行为可能会导致答案。但是，如果您的问题很复杂，那么它通常会导致无法回答的问题。如需指导，请阅读how to ask questions 和how to create a minimal example
  • 最好包括将 mysql 驱动程序 jar 放在哪里，以及如何运行它（独立或作为战争，如果在战争中，容器是什么）。

标签： spring-mvc spring-boot spring-data-jpa spring-data


【解决方案1】：

application.properties 中只有以下属性

server.port=8181
spring.thymeleaf.cache=false
# create and drop tables and sequences, loads import.sql
spring.jpa.hibernate.ddl-auto=create
# Oracle settings
spring.datasource.url=jdbc:mysql://localhost:3306/bookstore
spring.datasource.username=root
spring.datasource.password=oracle
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.show-sql=true

要使用您的 jpa 属性（spring.jpa.hibernate.ddl-auto &amp; spring.jpa.show-sql=true），请删除 hibernate 和 jbc 并添加 jpa。（或者您需要配置 hibernate 配置以使用 hibernate 特定属性来自动创建和显示 sql）

删除

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

<dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>

        </dependency>

并添加

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

您的 pom 和 application.properties 看起来不错，但似乎首先加载 oracle 设置然后 mysql 所以 jar 可能已损坏，请尝试这些解决方案

  1. 尝试重建项目(Build &gt; Rebuild Project)错误消失。

  2. 此错误的另一个原因是 JAR 损坏，因此请删除 .m2 directory 并运行 mvn clean install。

【讨论】：

    【解决方案2】：

    我添加了 mysql 连接器 jar 并且我的错误已解决但未在数据库中创建表？

    【讨论】：

    • 您是如何尝试创建表的？这可能是一个新问题吗？
    • 我正在使用休眠来创建表。我的实体代码是 {}
    • 实体公共类用户 { @Id @GeneratedValue(strategy=GenerationType.AUTO) private int id;私人字符串用户名；私人字符串密码，名字，姓氏，电子邮件，电话号码；私人布尔启用=真； // 所有的 getter 和 setter }
    【解决方案3】：

    根据reference documentation，连接数据库

    您通常不需要指定 driver-class-name，因为 Spring Boot 可以从 url 为大多数数据库推断它。

    所以从属性文件中删除spring.datasource.driver-class-name。

    还添加/替换 MySQL JDBC 驱动程序依赖项：

    <dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <scope>runtime</scope>
</dependency>

    【讨论】：

    • 去掉驱动类名后报错
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