java - 使用 java 代码配置创建管理 MongoDb 连接的 Jpa EntityManager
问题描述
我需要定义两个不同的持久单元,一个用于 mysql db,另一个用于 mongodb,我正在尝试使用 Spring 的 @Configuration 创建将管理 Mongo 的 entityManager,但应用程序在 Spring 的引导程序中失败并出现以下错误:错误创建在类路径资源 [com/intraway/qx/utilities/config/SpringDataJpaMongoConfiguration.class] 中定义的名称为“mongoEntityManager”的 bean:调用 init 方法失败;嵌套异常是 java.lang.NullPointerException
Java config Class
@Configuration
@EnableJpaRepositories(basePackages = { "com.intraway.qx.utilities.models.repositories.mongoRepository"},
entityManagerFactoryRef = "mongoEntityManager",
transactionManagerRef = "mongoTransactionManager")
@EnableTransactionManagement
public class SpringDataJpaMongoConfiguration {
@Bean(name = "mongoEntityManager")
public LocalContainerEntityManagerFactoryBean mongoEntityManager() {
Map<String, Object> properties = new HashMap<>();
properties.put("javax.persistence.transactionType", "resource_local");
properties.put("hibernate.ogm.datastore.provider","mongodb");
properties.put("hibernate.ogm.datastore.host","localhost");
properties.put("hibernate.ogm.datastore.port", "27017");
properties.put("hibernate.ogm.datastore.database", "qx_utils");
LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
em.setPackagesToScan("com.intraway.qx.utilities.models");
em.setPersistenceUnitName("persistence.mongo");
em.setJpaPropertyMap(properties);
em.setPersistenceProviderClass(HibernateOgmPersistence.class);
return em;
}
@Bean(name = "mongoTransactionManager")
public PlatformTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(mongoEntityManager().getObject());
return transactionManager;
}
}
POM.xml http://maven.apache.org/xsd/maven-4.0.0.xsd">4.0.0
<groupId>com.intraway.qx</groupId>
<artifactId>QX-AOS-Utilities</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>QX-AOS-Utilities</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repositories -->
</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
<version>2.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.3.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate.ogm</groupId>
<artifactId>hibernate-ogm-mongodb</artifactId>
<version>5.3.1.Final</version>
</dependency>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
我需要以编程方式(不是通过 application.properties 文件)配置数据库连接,这是一个要求。
解决方案
推荐阅读
- sql - 触发大量数据
- python-3.x - 如何在python中将大列表制作成小列表
- java - 带有图像和文本的 Apache Poi WORD 段落
- c# - C# 中的事件处理 - 没有回调
- haskell - 为什么我不能在类型族声明中使用约束类型?
- javascript - 如何仅为不支持 MathML 的浏览器加载 MathJax
- android - 滚动 ListView 时通用图像加载器滞后
- c# - 如何模拟具有参数的异步受保护方法?
- javascript - 来自服务器的 Javascript 长整数不准确
- google-apps-script - 在 Google Drive 中搜索文件并使用 google app 脚本搜索到 google sheet 的动态超链接