[BAEL-12800] - Added MultipleDataSourceConfiguration and added autowiring of DataSources in Product and User Config classes

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/MultipleDataSourceConfiguration.java

@@ -0,0 +1,33 @@
+package com.baeldung.multipledb;
+
+import javax.sql.DataSource;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+/**
+ * By default, the persistence-multiple-db.properties file is read for productDataSource() and userDataSource() 
+ * in PersistenceProductConfiguration and PersistenceUserConfiguration respectively. 
+ * <p>
+ * If we need to use persistence-multiple-db-boot.properties then uncomment the below @Configuration class and comment out
+ * productDataSource() and userDataSource() in PersistenceProductConfiguration and PersistenceUserConfiguration. 
+ */
+//@Configuration
+@PropertySource({"classpath:persistence-multiple-db-boot.properties"})
+public class MultipleDataSourceConfiguration {
+    
+    @Bean
+    @ConfigurationProperties(prefix="spring.user")
+    public DataSource userDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+    
+    @Bean
+    @ConfigurationProperties(prefix="spring.product")
+    public DataSource productDataSource() {
+        return DataSourceBuilder.create().build();
+    }
+}

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/PersistenceProductConfiguration.java

@@ -1,23 +1,23 @@
 package com.baeldung.multipledb;
 
-import java.util.HashMap;
-
-import javax.sql.DataSource;
-
+import com.google.common.base.Preconditions;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.boot.jdbc.DataSourceBuilder;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Profile;
 import org.springframework.context.annotation.PropertySource;
 import org.springframework.core.env.Environment;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 import org.springframework.transaction.PlatformTransactionManager;
 
+import javax.sql.DataSource;
+import java.util.HashMap;
+
 @Configuration
 @PropertySource({"classpath:persistence-multiple-db.properties"})
 @EnableJpaRepositories(basePackages = "com.baeldung.multipledb.dao.product", entityManagerFactoryRef = "productEntityManager", transactionManagerRef = "productTransactionManager")
@@ -26,6 +26,10 @@ public class PersistenceProductConfiguration {
     @Autowired
     private Environment env;
     
+    @Autowired
+    @Qualifier("productDataSource")
+    private DataSource productDataSource;
+
     public PersistenceProductConfiguration() {
         super();
     }
@@ -35,7 +39,7 @@ public class PersistenceProductConfiguration {
     @Bean
     public LocalContainerEntityManagerFactoryBean productEntityManager() {
         final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
-        em.setDataSource(productDataSource());
+        em.setDataSource(productDataSource);
         em.setPackagesToScan("com.baeldung.multipledb.model.product");
 
         final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
@@ -49,9 +53,14 @@ public class PersistenceProductConfiguration {
     }
 
     @Bean
-    @ConfigurationProperties(prefix="spring.product")
     public DataSource productDataSource() {
-        return DataSourceBuilder.create().build();
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("product.jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
     }
 
     @Bean

persistence-modules/spring-data-jpa/src/main/java/com/baeldung/multipledb/PersistenceUserConfiguration.java

@@ -1,24 +1,20 @@
 package com.baeldung.multipledb;
 
-import java.util.HashMap;
-
-import javax.sql.DataSource;
-
+import com.google.common.base.Preconditions;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.context.properties.ConfigurationProperties;
-import org.springframework.boot.jdbc.DataSourceBuilder;
-import org.springframework.context.annotation.Bean;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Primary;
-import org.springframework.context.annotation.Profile;
-import org.springframework.context.annotation.PropertySource;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.context.annotation.*;
 import org.springframework.core.env.Environment;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
 import org.springframework.orm.jpa.JpaTransactionManager;
 import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
 import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
 import org.springframework.transaction.PlatformTransactionManager;
 
+import javax.sql.DataSource;
+import java.util.HashMap;
+
 @Configuration
 @PropertySource({"classpath:persistence-multiple-db.properties"})
 @EnableJpaRepositories(basePackages = "com.baeldung.multipledb.dao.user", entityManagerFactoryRef = "userEntityManager", transactionManagerRef = "userTransactionManager")
@@ -27,6 +23,10 @@ public class PersistenceUserConfiguration {
     @Autowired
     private Environment env;
     
+    @Autowired
+    @Qualifier("userDataSource")
+    private DataSource userDataSource;
+
     public PersistenceUserConfiguration() {
         super();
     }
@@ -38,7 +38,7 @@ public class PersistenceUserConfiguration {
     public LocalContainerEntityManagerFactoryBean userEntityManager() {
         System.out.println("loading config");
         final LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
-        em.setDataSource(userDataSource());
+        em.setDataSource(userDataSource);
         em.setPackagesToScan("com.baeldung.multipledb.model.user");
 
         final HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
@@ -51,11 +51,15 @@ public class PersistenceUserConfiguration {
         return em;
     }
 
-    @Primary
     @Bean
-    @ConfigurationProperties(prefix="spring.user")
     public DataSource userDataSource() {
-        return DataSourceBuilder.create().build();
+        final DriverManagerDataSource dataSource = new DriverManagerDataSource();
+        dataSource.setDriverClassName(Preconditions.checkNotNull(env.getProperty("jdbc.driverClassName")));
+        dataSource.setUrl(Preconditions.checkNotNull(env.getProperty("user.jdbc.url")));
+        dataSource.setUsername(Preconditions.checkNotNull(env.getProperty("jdbc.user")));
+        dataSource.setPassword(Preconditions.checkNotNull(env.getProperty("jdbc.pass")));
+
+        return dataSource;
     }
 
     @Primary

persistence-modules/spring-data-jpa/src/main/resources/persistence-multiple-db-boot.properties

@@ -0,0 +1,18 @@
+# user data source
+spring.user.driverClassName=org.h2.Driver
+spring.user.jdbc-url=jdbc:h2:mem:spring_jpa_user;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS USERS
+spring.user.username=sa
+spring.user.username=sa
+
+# product data source
+spring.product.driverClassName=org.h2.Driver
+spring.product.jdbc-url=jdbc:h2:mem:spring_jpa_product;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS PRODUCTS
+spring.product.username=sa
+spring.product.username=sa
+
+# hibernate.X
+hibernate.dialect=org.hibernate.dialect.H2Dialect
+hibernate.show_sql=false
+hibernate.hbm2ddl.auto=create-drop
+hibernate.cache.use_second_level_cache=false
+hibernate.cache.use_query_cache=false

persistence-modules/spring-data-jpa/src/main/resources/persistence-multiple-db.properties

@@ -1,14 +1,9 @@
-# user data source
-spring.user.driverClassName=org.h2.Driver
-spring.user.jdbc-url=jdbc:h2:mem:spring_jpa_user;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS USERS
-spring.user.username=sa
-spring.user.username=sa
-
-# product data source
-spring.product.driverClassName=org.h2.Driver
-spring.product.jdbc-url=jdbc:h2:mem:spring_jpa_product;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS PRODUCTS
-spring.product.username=sa
-spring.product.username=sa
+# jdbc.X
+jdbc.driverClassName=org.h2.Driver
+user.jdbc.url=jdbc:h2:mem:spring_jpa_user;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS USERS
+product.jdbc.url=jdbc:h2:mem:spring_jpa_product;DB_CLOSE_DELAY=-1;INIT=CREATE SCHEMA IF NOT EXISTS PRODUCTS
+jdbc.user=sa
+jdbc.pass=sa
 
 # hibernate.X
 hibernate.dialect=org.hibernate.dialect.H2Dialect