無法加載驅動程序 class org.mariadb.jdbc.Driver

Question

我想在 Spring Boot 中配置 2 個 JNDI 數據源。 我試過這個配置：

應用程序.properties

spring.production-datasource.jndi-name=java:/global/production_gateway
spring.production-datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MariaDBDialect
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update

spring.warehouse-datasource.jndi-name=java:/global/production_warehouse
spring.warehouse-datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MariaDBDialect
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update

主數據源配置：

    @Configuration
@EnableJpaRepositories(
        basePackages = "org.datalis.plugin.production.entity", 
        entityManagerFactoryRef = "productionEntityManager", 
        transactionManagerRef = "productionTransactionManager"
    )
@EnableTransactionManagement
public class ContextProductionDatasource {

    @Autowired
    private Environment env;

    @Primary
    @Bean(name = "productionDataSourceProperties")
    @ConfigurationProperties(prefix="spring.production.datasource")
    public DataSourceProperties productionDataSourceProperties() {
        return new DataSourceProperties();
    }   

    @Primary
    @Bean(name = "productionDataSource")
    @ConfigurationProperties(prefix="spring.production.datasource")
    public DataSource productionDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "productionEntityManager") 
    public EntityManager productionEntityManager(EntityManagerFactory emf) {
        return emf.createEntityManager();
    }

    @Primary
    @Bean(name = "productionTransactionManager")    
    public PlatformTransactionManager productionTransactionManager(final EntityManagerFactory emf) {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }

    @Primary
    @Bean(name = "productionExceptionTranslation")
    public PersistenceExceptionTranslationPostProcessor productionExceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

第二個數據源配置：

    @Configuration
@EnableJpaRepositories(
        basePackages = "org.datalis.plugin.warehouse.entity", 
        entityManagerFactoryRef = "warehouseEntityManager", 
        transactionManagerRef = "warehouseTransactionManager"
    )
@EnableTransactionManagement
public class ContextWarehouseDatasource {

    @Autowired
    private Environment env;

    @Bean(name = "warehouseDataSourceProperties")
    @ConfigurationProperties(prefix="spring.warehouse.datasource")
    public DataSourceProperties warehouseDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean(name = "warehouseDataSource")
    @ConfigurationProperties(prefix="spring.warehouse.datasource")
    public DataSource warehouseDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "warehouseEntityManager")  
    public EntityManager warehouseEntityManager(EntityManagerFactory emf) {
        return emf.createEntityManager();
    }

    @Bean(name = "warehouseTransactionManager")
    public PlatformTransactionManager warehouseTransactionManager(final EntityManagerFactory emf) {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }

    @Bean(name = "warehouseExceptionTranslation")
    public PersistenceExceptionTranslationPostProcessor warehouseExceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

但是在部署過程中出現錯誤：

    Caused by: java.lang.IllegalStateException: Unable to set value for property driver-class-name
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.JavaBeanBinder$BeanProperty.setValue(JavaBeanBinder.java:349)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.JavaBeanBinder.bind(JavaBeanBinder.java:96)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.JavaBeanBinder.bind(JavaBeanBinder.java:79)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.JavaBeanBinder.bind(JavaBeanBinder.java:56)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder.lambda$bindDataObject$5(Binder.java:452)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder$Context.withIncreasedDepth(Binder.java:570)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder$Context.withDataObject(Binder.java:556)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder$Context.access$400(Binder.java:513)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder.bindDataObject(Binder.java:450)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder.bindObject(Binder.java:391)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.Binder.bind(Binder.java:320)
        ... 132 more
Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at deployment.datalis_rest_api.war//org.springframework.boot.context.properties.bind.JavaBeanBinder$BeanProperty.setValue(JavaBeanBinder.java:346)
        ... 142 more
Caused by: java.lang.RuntimeException: Failed to load driver class org.mariadb.jdbc.Driver in either of HikariConfig class loader or Thread context classloader
        at deployment.datalis_rest_api.war//com.zaxxer.hikari.HikariConfig.setDriverClassName(HikariConfig.java:485)

我正在使用部署到 Wildfly 服務器的 Spring boot war 和已部署的 mariadb-java-client-2.4.2.jar。 當我使用單一數據源配置時它工作正常。 但是對於第二個數據源，我得到了異常。

你知道我該如何解決這個問題嗎？

第二次嘗試：

應用程序.properties：

spring.production.datasource.jndi-name=java:/global/production_gateway
spring.production.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.production.jpa.properties.hibernate.dialect=org.hibernate.dialect.MariaDBDialect
spring.production.jpa.show-sql = true
spring.production.jpa.hibernate.ddl-auto = update

spring.warehouse.datasource.jndi-name=java:/global/production_warehouse
spring.warehouse.datasource.driver-class-name=org.mariadb.jdbc.Driver
spring.warehouse.jpa.properties.hibernate.dialect=org.hibernate.dialect.MariaDBDialect
spring.warehouse.jpa.show-sql = true
spring.warehouse.jpa.hibernate.ddl-auto = update

第一個數據源：

@Configuration
@EnableJpaRepositories(
        basePackages = "org.datalis.plugin.production.entity", 
        entityManagerFactoryRef = "productionEntityManager", 
        transactionManagerRef = "productionTransactionManager"
    )
@EnableTransactionManagement
public class ContextProductionDatasource {

    @Primary
    @Bean(name = "productionDataSourceProperties")
    @ConfigurationProperties(prefix="spring.production")
    public DataSourceProperties productionDataSourceProperties() {
        return new DataSourceProperties();
    }   

    @Primary
    @Bean(name = "productionDataSource")
    @ConfigurationProperties(prefix="spring.production")
    public DataSource productionDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Primary
    @Bean(name = "productionEntityManager") 
    public EntityManager productionEntityManager(EntityManagerFactory emf) {
        return emf.createEntityManager();
    }

    @Primary
    @Bean(name = "productionTransactionManager")    
    public PlatformTransactionManager productionTransactionManager(final EntityManagerFactory emf) {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }

    @Primary
    @Bean(name = "productionExceptionTranslation")
    public PersistenceExceptionTranslationPostProcessor productionExceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

第二個數據源：

@Configuration
@EnableJpaRepositories(
        basePackages = "org.datalis.plugin.warehouse.entity", 
        entityManagerFactoryRef = "warehouseEntityManager", 
        transactionManagerRef = "warehouseTransactionManager"
    )
@EnableTransactionManagement
public class ContextWarehouseDatasource {

    @Bean(name = "warehouseDataSourceProperties")
    @ConfigurationProperties(prefix="spring.warehouse")
    public DataSourceProperties warehouseDataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean(name = "warehouseDataSource")
    @ConfigurationProperties(prefix="spring.warehouse")
    public DataSource warehouseDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "warehouseEntityManager")  
    public EntityManager warehouseEntityManager(EntityManagerFactory emf) {
        return emf.createEntityManager();
    }

    @Bean(name = "warehouseTransactionManager")
    public PlatformTransactionManager warehouseTransactionManager(final EntityManagerFactory emf) {
        final JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);
        return transactionManager;
    }

    @Bean(name = "warehouseExceptionTranslation")
    public PersistenceExceptionTranslationPostProcessor warehouseExceptionTranslation() {
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

現在我得到：

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean]: Factory method 'entityManagerFactory' threw exception; nested exception is java.lang.IllegalArgumentException: dataSource or dataSourceClassName or jdbcUrl is required.
        at deployment.datalis_rest_api.war//org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
        at deployment.datalis_rest_api.war//org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:640)
        ... 41 more
Caused by: java.lang.IllegalArgumentException: dataSource or dataSourceClassName or jdbcUrl is required.

Answer 1

更正兩個 entityManager bean 的名稱：productionEntityManager 和 warehouseEntityManager

@EnableJpaRepositories中的entityManagerFactoryRef是 beanName 引用，

所以用

@Configuration
@EnableJpaRepositories(
        basePackages = "org.datalis.plugin.production.entity", 
        entityManagerFactoryRef = "productionEntityManager",  
        transactionManagerRef = "productionTransactionManager" 
    )
@EnableTransactionManagement
public class ContextProductionDatasource {

  ...

 @Primary
    @Bean   
    public EntityManager productionEntityManager(EntityManagerFactory emf) {
        return emf.createEntityManager();
    }

和

@Configuration
@EnableJpaRepositories(
        basePackages = "org.datalis.plugin.warehouse.entity", 
        entityManagerFactoryRef = "warehouseEntityManager", 
        transactionManagerRef = "warehouseTransactionManager"
    )
@EnableTransactionManagement
public class ContextWarehouseDatasource {

   ...

    @Bean   
    public EntityManager warehouseEntityManager(EntityManagerFactory emf) {
        return emf.createEntityManager();
    }

您需要將@ConfigurationProperties中的屬性名稱與屬性 ' - ' 與 ' 的值相匹配。 '

使用@ConfigurationProperties(prefix="spring.production-datasource")和@ConfigurationProperties(prefix="spring.warehouse-datasource")

並確保您的類路徑中有驅動程序

喜歡

<dependency>
    <groupId>org.mariadb.jdbc</groupId>
    <artifactId>mariadb-java-client</artifactId>
    <version>2.5.2</version>
    <scope>runtime</scope>
</dependency>

Answer 2

在您的屬性中，您正在使用spring.production-datasource但是在 Spring @Configuration您正在嘗試使用 map 使用@ConfigurationProperties(prefix = "spring.production.datasource") . 從 Spring Boot 2 開始，寬松的屬性綁定規則現在更加嚴格，因此這里的破折號和點之間存在不匹配。

您需要將屬性更改為spring.production.datasource或使用@ConfigurationProperties(prefix = "spring.production-datasource") 。

配置 Spring 引導DataSource時，您可以使用jndi-name或提供連接詳細信息，不能同時使用兩者。 根據通用應用程序屬性：

spring.datasource.jndi-name

數據源的 JNDI 位置。 Class，url，用戶名和密碼被忽略

您很可能必須刪除spring.production-datasource.driver-class-name屬性，因為它與jndi-name沖突。

Answer 3

（免責聲明：我是 Spring Boot、H2、Maven 等的新手）

只是我的 2c，以防其他新手在收到此特定錯誤后登陸此問題頁面：

在將依賴項添加到pom.xml並將需要的屬性添加到application.properties文件后，我立即收到此錯誤。

嘗試從 Eclipse IDE 運行應用程序會失敗，並顯示此Failed to load driver class org.mariadb.jdbc.Driver錯誤。 我的第一個想法是 Maven 可能由於某種原因沒有獲取依賴項，但是mariadb-java-client.jar文件在~/.m2/repository/org/mariadb/jdbc中，因此我假設那里的一切都是正確的.

快速谷歌搜索表明應該沒有太多其他事情要做，它應該可以工作（tm）。 我沒有想法，半隨機地從 shell 調用mvnw clean install ，一切正常——應用程序正常啟動。

受到這種巨大隨機成功的鼓舞，我在 Eclipse 中關閉並重新打開了該項目。瞧瞧； 神奇的是，一切也開始在那里工作。