我尝试使用spring-boot-starter-data-jpa
和haznate通过this example连接到mysql,但得到
... 2016-07-28 13:20:49.021 ERROR 7765 --- [main] osboot.SpringApplication:应用程序启动失败org.springframework.beans.factory.BeanCreationException:创建名为'org.springframework.boot.autoconfigure的bean时出错。 orm.jpa.HibernateJpaAutoConfiguration':注入自动连接的依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException:无法自动装配字段:private javax.sql.DataSource org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration.dataSource;嵌套异常是org.springframework.beans.factory.BeanCreationException:在类路径资源中定义名为'dataSource'的bean时出错[org / springframework / boot / autoconfigure / jdbc / DataSourceAutoConfiguration $ NonEmbeddedConfiguration.class]:通过工厂方法进行Bean实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException:无法实例化[javax.sql.DataSource]:工厂方法'dataSource'抛出异常;嵌套异常是org.springframework.boot.autoconfigure.jdbc.DataSourceProperties $ DataSourceBeanCreationException:无法确定数据库类型为NONE的嵌入式数据库驱动程序类。如果你想要一个嵌入式数据库,请在类路径上放置一个受支持的数据库。如果您要从特定配置文件加载数据库设置,则可能需要激活它(当前没有配置文件处于活动状态)
...
application.properties:
# DataSource settings: set here your own configurations for the database
# connection. In this example we have "netgloo_blog" as database name and
# "root" as username and password.
spring.datasource.url = jdbc:mysql://localhost:3306/db
spring.datasource.username = db
spring.datasource.password = pass
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager)
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
日食中的项目结构:
build.gradle:
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle- plugin:1.3.6.RELEASE")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'
jar {
baseName = 'gs-accessing-data-jpa'
version = '0.1.0'
}
repositories {
mavenCentral()
maven { url "https://repository.jboss.org/nexus/content/repositories/releases" }
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
dependencies {
compile("org.springframework.boot:spring-boot-starter-data-jpa")
compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '1.3.6.RELEASE'
compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.3'
//also tried
runtime group: 'mysql', name: 'mysql-connector-java', version: '6.0.3'
runtime "org.apache.tomcat:tomcat-jdbc:7.0.47"
testCompile("junit:junit")
}
task wrapper(type: Wrapper) {
gradleVersion = '2.3'
}
您没有添加驱动程序类
spring.datasource.driver类名= com.mysql.jdbc.Driver
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
检查这些依赖项
你可以在gradle中添加运行时依赖,而不是在MYSQL驱动程序jar上编译时依赖吗?
dependencies {
//compile "mysql:mysql-connector-java:6.0.3"
runtime "mysql:mysql-connector-java:6.0.3"
runtime "org.apache.tomcat:tomcat-jdbc:7.0.47"
}
你在类路径上有数据库驱动程序吗?你有设置属性spring.datasource.driver-class-name?
有关更多详细信息,请参阅http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-sql.html