BeanCreationException：無法確定數據庫類型 NONE 的嵌入式數據庫驅動程序類

Question

我正在嘗試運行我的程序，我總是得到這個異常：

Caused by: org.springframework.beans.factory.BeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath.
at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.getDriverClassName(DataSourceProperties.java:137)
at org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$NonEmbeddedConfiguration.dataSource(DataSourceAutoConfiguration.java:117)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
... 45 more

我正在通過 gradle 導入所有依賴項：

buildscript {
repositories {
    mavenCentral()
}
dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.7.RELEASE")
}
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'idea'
apply plugin: 'spring-boot'

jar {
baseName = 'flatify-backend-service'
version =  '0.1.0'
}

repositories {
mavenCentral()
}

sourceCompatibility = 1.8
targetCompatibility = 1.8

dependencies {
compile("org.springframework.boot:spring-boot-starter-web")
compile 'org.springframework.boot:spring-boot-starter-data-jpa'
compile 'org.hibernate:hibernate-core:4.3.6.Final'
compile 'javax.servlet:javax.servlet-api:3.1.0'
compile 'org.javassist:javassist:3.15.0-GA'
compile 'mysql:mysql-connector-java:5.1.31'
compile 'commons-dbcp:commons-dbcp:1.4'
testCompile("junit:junit")
testCompile("org.springframework:spring-test")
}

task wrapper(type: Wrapper) {
gradleVersion = '2.5'
}

如您所見，我正在添加 mysql-connector 是不是應該將驅動程序類添加到我的項目中？ 我錯過了什么嗎？

我只添加了最后一個異常，因為所有其他異常都是由這個引起的。 如果您需要任何其他詳細信息，請告訴我。

謝謝

我的配置類：

@Configuration
@EnableTransactionManagement
public class PersistenceJPAConfig {

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
    LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
    em.setDataSource(dataSource());
    em.setPackagesToScan(new String[] { "at.flatify.persistance.entity" });

    JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    em.setJpaVendorAdapter(vendorAdapter);
    em.setJpaProperties(additionalProperties());

    return em;
}


@Bean(destroyMethod = "close")
public DataSource dataSource() {
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    dataSource.setDriverClassName("com.mysql.jdbc.Driver");
    dataSource.setUrl("jdbc:mysql://localhost:3306/flatify");
    dataSource.setUsername("user");
    dataSource.setPassword("password");

    return dataSource;
}

@Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf){
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf);

    return transactionManager;
}

@Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){
    return new PersistenceExceptionTranslationPostProcessor();
}

Properties additionalProperties() {
    Properties properties = new Properties();
    properties.setProperty("hibernate.hbm2ddl.auto", "create-drop");
    properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
    return properties;
}

}

Answer 1

Spring boot 無法確定使用哪個驅動程序。 您需要在某處指定以下屬性： spring.datasource.driverClassName 您還需要指定其他屬性，請查看文檔。

Answer 2

我遇到了同樣的問題，我通過在我的項目的類路徑中簡單地添加一個 eclipselink-javax.persistence-2.0 jar 來解決它。 您可以從下面給出的鏈接下載它。 或者簡單地添加添加以下依賴項

<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.0.0</version>
</dependency>

jar下載鏈接

Answer 3

您需要禁用（排除）DataSourceAutoConfiguration 或刪除數據源的類 PersistenceJPAConfig 配置並使用 application.properties 對其進行配置。

spring 文檔中的一個很好的例子： https ://spring.io/guides/gs/accessing-data-mysql/