How to use MySQL and neo4j in single spring-boot application - mysql

Question

I have created application with spring-boot and neo4j. Following is spring boot application with neo4j
#Configuration
#ComponentScan({ "myproject" })
#EnableAutoConfiguration
#EnableNeo4jRepositories(basePackages = "myproject")
public class Neo4jServer extends Neo4jConfiguration implements CommandLineRunner
{
public Server()
{
setBasePackage("myproject");
}
#Bean
SpringRestGraphDatabase graphDatabaseService()
{
return new SpringRestGraphDatabase("http://localhost:7474/db/data");
}
public void run(String... args) throws Exception
{
}
public static void main(String[] args) throws Exception
{
SpringApplication.run(Neo4jServer.class, args);
}
}
AND following is spring boot application with mysql
#Configuration
#ComponentScan({ "myproject" })
#EnableAutoConfiguration
#EnableJpaRepositories(basePackages = "myproject.persistence")
#PropertySource("myproject.properties")
public class MySQLServer extends DataSourceAutoConfiguration implements CommandLineRunner
{
public void run(String... args) throws Exception
{
}
public static void main(String[] args) throws Exception
{
SpringApplication.run(MySQLServer.class, args);
}
}
I have created properties file in resource package.
spring.datasource.url=jdbc:mysql://localhost:3306/myDB
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driverClassName=com.mysql.jdbc.Driver
So, There are now two application, one is with neo4j ie Neo4jServer.java and one is with MySQL ie MySQLServer.java
How to use both in single application.
Please make me correct if wrong.
Thank you :)

Answer 1

Need to inject MySQL configured DataSource/TransactionManager bean to application class. MySQL Entities/DAO and Neo4j Node/Relationship/DAO needs to be in different packages. Then you can provide those respective packages for scan to MySQL and Neo4j.
Following code shows the configuration :
#Configuration
#ComponentScan({ "myproject" })
#EnableJpaRepositories(basePackages = "myproject.persistence.mysql")
#EnableAutoConfiguration
#EnableNeo4jRepositories(basePackages = "myproject.persistence.neo4j")
public class Application extends Neo4jConfiguration
{
#Autowired
LocalContainerEntityManagerFactoryBean entityManagerFactory;
public Application()
{
setBasePackage("myproject.persistence.neo4j");
}
#Bean
SpringRestGraphDatabase graphDatabaseService()
{
return new SpringRestGraphDatabase("http://localhost:7474/db/data");
}
#Bean(destroyMethod = "close")
public DataSource dataSource()
{
DataSource dataSource = new DataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/dbname");
dataSource.setUsername("mysqluser");
dataSource.setPassword("mysqlpassword");
return dataSource;
}
#Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory()
{
LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
entityManagerFactory.setDataSource(dataSource());
entityManagerFactory.setPackagesToScan("myproject.persistence.mysql");
entityManagerFactory.setJpaDialect(new HibernateJpaDialect());
Map<String, String> jpaProperties = new HashMap<String, String>();
jpaProperties.put("hibernate.connection.charSet", "UTF-8");
jpaProperties.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.EJB3NamingStrategy");
jpaProperties.put("hibernate.bytecode.provider", "javassist");
jpaProperties.put("hibernate.dialect", "org.hibernate.dialect.MySQL5InnoDBDialect");
entityManagerFactory.setJpaPropertyMap(jpaProperties);
entityManagerFactory.setPersistenceProvider(new HibernatePersistence());
return entityManagerFactory;
}
#Override
#Bean(name = "transactionManager")
public PlatformTransactionManager neo4jTransactionManager() throws Exception
{
return new ChainedTransactionManager(new JpaTransactionManager(entityManagerFactory.getObject()),
new JtaTransactionManagerFactoryBean(graphDatabaseService()).getObject());
}
#Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation()
{
return new PersistenceExceptionTranslationPostProcessor();
}
}