Access multiple datasources with jdbcTemplates in one Service class - spring-boot

Question

Here is my case:
I have two databases: one sybase and one mssql. I wish to access both of the database in a single service class. For example, I want to get some data from sybase, then I need do some update on mssql.
I have setup two datasources based on multiple samples found online, but Im unable to access my second database (sybase).
Here is my code:
pom.xml
spring.mvc.view.prefix: /WEB-INF/jsp/
spring.mvc.view.suffix: .jsp
# Database
# spring.datasource.jndi-name=jdbc/database1
spring.datasource.driver-class-name=net.sourceforge.jtds.jdbc.Driver
spring.datasource.url=jdbc:jtds:sqlserver://database1/db_aes
spring.datasource.username=user1
spring.datasource.password=password1
# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
# 2nd Database
spring.secondDatasource.driver-class-name=net.sourceforge.jtds.jdbc.Driver
spring.secondDatasource.url=jdbc:jtds:sybase://database2/aidcconfig
spring.secondDatasource.username=user2
spring.secondDatasource.password=password2
spring.secondDatasource.hibernate.dialect = org.hibernate.dialect.SybaseASE15Dialect
spring.secondDatasource.testWhileIdle = true
spring.secondDatasource.validationQuery = SELECT 1
# Show or not log for each sql query
spring.jpa.show-sql = false
# Hibernate ddl auto (create, create-drop, update, validate)
spring.jpa.hibernate.ddl-auto = validate
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.EJB3NamingStrategy
# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager)
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.SQLServerDialect
com.ibm.websphere.persistence.ApplicationsExcludedFromJpaProcessing=*
fileUploadServiceImpl
#Component("fileUploadService")
#Transactional
public class FileUploadServiceImpl implements FileUploadService {
#Autowired
#Qualifier("dbAesJdbcTemplate")
JdbcTemplate dbAesJdbcTemplate;
#Autowired
#Qualifier("aidcconfigJdbcTemplate")
JdbcTemplate aidcconfigJdbcTemplate;
private int uploadId = 1;
private void testDB(){
String db = aidcconfigJdbcTemplate.queryForObject("select db_name()", String.class);
System.out.println("database name: " + db);
}
...
}
DbAesDataSource
package config.database;
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(
entityManagerFactoryRef = "dbAesEntityManagerFactory",
transactionManagerRef = "dbAesTransactionManager",
basePackages = {"web.fileUpload.repo.db_aes.dao"}
)
public class DbAesDataSource {
#Primary
#Bean(name="dbAesDataSource")
#ConfigurationProperties(prefix = "spring.datasource")
public DataSource dbAesDataSource(){
return DataSourceBuilder.create().build();
}
#Bean(name="dbAesJdbcTemplate")
public JdbcTemplate dbAesJdbcTemplate(#Qualifier("dbAesDataSource") DataSource dbAesDataSource)
{
return new JdbcTemplate(dbAesDataSource);
}
#Bean(name="dbAesEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean dbAesEntityManagerFactory(
EntityManagerFactoryBuilder builder,
#Qualifier("dbAesDataSource") DataSource dbAesDataSource) {
return builder
.dataSource(dbAesDataSource)
.packages("web.fileUpload.repo.db_aes.models")
.build();
}
#Bean(name = "dbAesTransactionManager")
public PlatformTransactionManager dbAesTransactionManager(
#Qualifier("dbAesEntityManagerFactory") EntityManagerFactory dbAesEntityManagerFactory) {
return new JpaTransactionManager(dbAesEntityManagerFactory);
}
}
AidcconfigDataSource
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(
entityManagerFactoryRef = "aidcconfigEntityManagerFactory",
transactionManagerRef = "aidcconfigTransactionManager",
basePackages = {"web.fileUpload.repo.aidcconfig.dao"}
)
public class AidcconfigDataSource {
#Bean(name="aidcconfigDataSource")
#ConfigurationProperties(prefix = "spring.secondDatasource")
public DataSource aidcconfigDataSource(){
return DataSourceBuilder.create().build();
}
#Bean(name="aidcconfigJdbcTemplate")
public JdbcTemplate aidcconfigJdbcTemplate(#Qualifier("aidcconfigDataSource") DataSource aidcconfigDataSource)
{
return new JdbcTemplate(aidcconfigDataSource);
}
#Bean(name="aidcconfigEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean aidcconfigEntityManagerFactory(
EntityManagerFactoryBuilder builder,
#Qualifier("aidcconfigDataSource") DataSource aidcconfigDataSource) {
return builder
.dataSource(aidcconfigDataSource)
.packages("web.fileUpload.repo.aidcconfig.models")
.build();
}
#Bean(name = "aidcconfigTransactionManager")
public PlatformTransactionManager aidcconfigTransactionManager(
#Qualifier("aidcconfigEntityManagerFactory") EntityManagerFactory aidcconfigEntityManagerFactory) {
return new JpaTransactionManager(aidcconfigEntityManagerFactory);
}
}
Here is my error:
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.3.5.RELEASE:run (default-cli) on
project testUpload: An exception occurred while running. null: InvocationTargetException: Error creating bean with
name 'fileDownloadController': Injection of autowired dependencies failed; nested exception is org.springframework
.beans.factory.BeanCreationException: Could not autowire field: private web.fileUpload.services.FileUploadService w
eb.fileUpload.controller.FileDownloadController.fileUploadService; nested exception is org.springframework.beans.fa
ctory.BeanCreationException: Error creating bean with name 'fileUploadService': Injection of autowired dependencies
failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org
.springframework.jdbc.core.JdbcTemplate web.fileUpload.services.FileUploadServiceImpl.dbAesJdbcTemplate; nested exc
eption is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springfr
amework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidat
e for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=tr
ue), #org.springframework.beans.factory.annotation.Qualifier(value=dbAesJdbcTemplate)} -> [Help 1]
If I removed the Qualifier in the FileUploadServiceImpl, then any jdbcTemplate will only connect to my Primary database which is db_aes. How can I access to my second datasource using jdbcTemplate?
Following are some of the references I used:
Spring Boot, Spring Data JPA with multiple DataSources
https://www.infoq.com/articles/Multiple-Databases-with-Spring-Boot
Multiple DataSource and JdbcTemplate in Spring Boot (> 1.1.0)
Trial#1
I noticed that it is unable to create the bean, and I placed some logger in the AidcconfigDataSource class. As a result, I didn't see my method is being executed. Thus, I assumed that the application is not reading my AidcconfigDataSource class.
I relocated the config folder as such, from java/config to java/web/config:
now I have another error:
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.3.5.RELEASE:run (default-cli) on
project testUpload: An exception occurred while running. null: InvocationTargetException: Error creating bean with
name 'dataSourceInitializerPostProcessor': Injection of autowired dependencies failed; nested exception is org.spr
ingframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.beans.facto
ry.BeanFactory org.springframework.boot.autoconfigure.jdbc.DataSourceInitializerPostProcessor.beanFactory; nested e
xception is org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'aidc
configDataSource' defined in class path resource [web/config/database/AidcconfigDataSource.class]: factory-bean ref
erence points back to the same bean definition -> [Help 1]
Trial#2
I have changed my bean name from aidcconfigDataSource to aidcconfigDS and same to the primary datasource. Plus I have added "spring.jpa.open_in_view = false" in my application.properties. However another error happens. How to do this the right way?
2016-11-03 09:28:16.118 ERROR 11412 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.servic
e() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exce
ption is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springf
ramework.transaction.PlatformTransactionManager] is defined: expected single matching bean but found 2: dbAesTransa
ctionManager,aidcconfigTransactionManager] with root cause
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.
transaction.PlatformTransactionManager] is defined: expected single matching bean but found 2: dbAesTransactionMana
ger,aidcconfigTransactionManager

Answer 1

I think Spring Boot is trying to instantiate 2 beans with the same name:
aidcconfigDataSource.
One is your configuration class AidcconfigDataSource.class and the other one is the bean:
#Bean(name="aidcconfigDataSource")
#ConfigurationProperties(prefix = "spring.secondDatasource")
public DataSource aidcconfigDataSource(){
return DataSourceBuilder.create().build();
}