使用SpringBoot整合数据库连接池Druid的错误总结

前言

今天使用SpringBoot整合数据库连接池Druid的错误总结的时候，遇到了几个问题，都已经解决，在这里分享给大家

发现和解决问题

在这些问题中，我会通过复制关键字和截图的方式，帮助大家确实错误是否一致

问题1

如图所示，控制台显示貌似已经成功了，但是我们可以发现，其实在启动成功之后，因为一个错误，导致系统停止了

想要解决这个问题，可以再加一个jar包

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.1.RELEASE</version>
        </dependency>

这时候我们再次启动，解决问题

问题2

关键日志：

Caused by: java.lang.ClassNotFoundException: org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘dataSource’: Unsatisfied dependency expressed through field ‘basicProperties’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘spring.datasource-org.springframework.boot.autoconfigure.jdbc.DataSourceProperties’: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.jdbc.DataSourceProperties]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseType

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘spring.datasource-org.springframework.boot.autoconfigure.jdbc.DataSourceProperties’: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.autoconfigure.jdbc.DataSourceProperties]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseType

解决这个问题，也是需要一个jar包

  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

再次启动解决问题

需要注意的地方

配置数据库的相关信息的时候

注意用户名和密码，以及url，尤其是url，不同的库以及版本不同，都会导致url出错

还有就是jar包冲突，缺少jar包等

相关代码

这里我把我的pom相关依赖和配置文件分享给大家

    <dependencies>
        <!--druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.21</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>2.7.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.1.RELEASE</version>
        </dependency>


    </dependencies>

spring.datasource.druid.url=jdbc:mysql://localhost:3306/test?serverTimezone=GMT&allowPublicKeyRetrieval=true&useSSL=false&characterEncoding=utf8
spring.datasource.druid.username=root
spring.datasource.druid.password=root
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.druid.initialSize=10
spring.datasource.druid.maxActive=20
spring.datasource.druid.maxWait=60000
spring.datasource.druid.minIdle=1
spring.datasource.druid.timeBetweenEvictionRunsMillis=60000
spring.datasource.druid.minEvictableIdleTimeMillis=300000
spring.datasource.druid.testWhileIdle=true
spring.datasource.druid.testOnBorrow=true
spring.datasource.druid.testOnReturn=false
spring.datasource.druid.poolPreparedStatements=true
spring.datasource.druid.maxOpenPreparedStatements=20
spring.datasource.druid.validationQuery=SELECT 1
spring.datasource.druid.validation-query-timeout=500
spring.datasource.druid.filters=stat


spring.datasource.druid.stat-view-servlet.enabled=true
# 访问地址规则
spring.datasource.druid.stat-view-servlet.url-pattern=/druid/*
# 是否允许清空统计数据
spring.datasource.druid.stat-view-servlet.reset-enable=true
# 监控页面的登录账户
spring.datasource.druid.stat-view-servlet.login-username=admin
# 监控页面的登录密码
spring.datasource.druid.stat-view-servlet.login-password=admin

总结

以上就是我遇到并解决的问题，有一些地方还不是很明白，随着学习会持续更新