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[英]Can I get a reference from a JPA bean to the EntityManager instance that manages it?
[英]Create Jpa EntityManager that manages MongoDb connection with java code configuration
我需要定義兩個不同的持久單元,一個用於mysql db,另一個用於mongodb,我試圖用Spring的@Configuration創建將管理Mongo的entityManager,但是應用程序在Spring的引導程序中失敗,並出現以下錯誤:錯誤在類路徑資源[com / intraway / qx / utilities / config / SpringDataJpaMongoConfiguration.class]中創建名稱為'mongoEntityManager'的bean:調用init方法失敗; 嵌套的異常是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>
我需要以編程方式配置DB連接(不通過application.properties文件),這是必需的。
實際上,我不知道您是否在MySQL DB配置中使用了@Primary
批注。 但是,如果您使用兩個數據源,則必須將其中一個設置為主。
您可以遵循本教程,即使它使用屬性也可以,但是您也可以將它們加入配置類。
4.為Oracle數據庫“ foo”創建一個名為“ FooDbConfig.java”的配置類。
包com.foobar;
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactory",
basePackages = { "com.foobar.foo.repo" }
)
public class FooDbConfig {
@Primary
@Bean(name = "dataSource")
@ConfigurationProperties(prefix = "spring.datasource")
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}
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