Couldn't determine Dialect for "oracle" - oracle

Question

I am using Spring boot(2.3.5), Oracle19c DB, and Hibernate(5.4).
I tried to make multi-datasource connection, but I keep getting a dialect error Couldn't determine Dialect for "oracle".
Error creating bean with name 'jdbcDialect' defined in class path resource [org/springframework/boot/autoconfigure/data/jdbc/JdbcRepositoriesAutoConfiguration$SpringBootJdbcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.relational.core.dialect.Dialect]: Factory method 'jdbcDialect' threw exception; nested exception is org.springframework.data.jdbc.repository.config.DialectResolver$NoDialectException: Cannot determine a dialect for org.springframework.jdbc.core.JdbcTemplate#2ba9ed19. Please provide a Dialect.
I basically followed this tutorial to configure multiple data sources.
application.properties:
spring.datasource-primary.username=oracleprimary
spring.datasource-primary.password=oracleprimary
spring.datasource-primary.url=jdbc:oracle:thin:#//localhost:1521/orcl
spring.datasource-secondary.driver-class-name=oracle.jdbc.OracleDriver
spring.datasource-secondary.username=oraclesecondary
spring.datasource-secondary.password=oraclesecondary
spring.datasource-secondary.url=jdbc:oracle:thin:#//localhost:1521/orcl
Primary configuration:
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(
entityManagerFactoryRef = "primaryEntityManagerFactory",
transactionManagerRef = "primaryTransactionManager",
basePackages = {"com.foo.primary.repository"})
public class PrimaryDataSourceConfiguration {
#Primary
#Bean(name = "primaryDataSourceProperties")
#ConfigurationProperties("spring.datasource-primary")
public DataSourceProperties primaryDataSourceProperties() {
return new DataSourceProperties();
}
#Primary
#Bean(name = "primaryDataSource")
#ConfigurationProperties("spring.datasource-primary.configuration")
public DataSource primaryDataSource(#Qualifier("primaryDataSourceProperties") DataSourceProperties primaryDataSourceProperties) {
return primaryDataSourceProperties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
}
#Primary
#Bean(name = "primaryEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean primaryEntityManagerFactory(
EntityManagerFactoryBuilder primaryEntityManagerFactoryBuilder, #Qualifier("primaryDataSource") DataSource primaryDataSource) {
Map<String, String> primaryJpaProperties = new HashMap<>();
primaryJpaProperties.put("hibernate.dialect", "org.hibernate.dialect.Oracle12cDialect");
return primaryEntityManagerFactoryBuilder
.dataSource(primaryDataSource)
.packages("com.foo.primary.model")
.persistenceUnit("primaryDataSource")
.properties(primaryJpaProperties)
.build();
}
#Primary
#Bean(name = "primaryTransactionManager")
public PlatformTransactionManager primaryTransactionManager(
#Qualifier("primaryEntityManagerFactory") EntityManagerFactory primaryEntityManagerFactory) {
return new JpaTransactionManager(primaryEntityManagerFactory);
}
Second configuration:
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(
entityManagerFactoryRef = "secondaryEntityManagerFactory",
transactionManagerRef = "secondaryTransactionManager",
basePackages = {"com.foo.secondary.repository"})
public class SecondaryDataSourceConfiguration {
#Bean(name = "secondaryDataSourceProperties")
#ConfigurationProperties("spring.datasource-secondary")
public DataSourceProperties secondaryDataSourceProperties() {
return new DataSourceProperties();
}
#Bean(name = "secondaryDataSource")
#ConfigurationProperties("spring.datasource-secondary.configuration")
public DataSource secondaryDataSource(#Qualifier("secondaryDataSourceProperties") DataSourceProperties secondaryDataSourceProperties) {
return secondaryDataSourceProperties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
}
#Bean(name = "secondaryEntityManagerFactory")
public LocalContainerEntityManagerFactoryBean secondaryEntityManagerFactory(
EntityManagerFactoryBuilder secondaryEntityManagerFactoryBuilder, #Qualifier("secondaryDataSource") DataSource secondaryDataSource) {
Map<String, String> secondaryJpaProperties = new HashMap<>();
secondaryJpaProperties.put("hibernate.dialect", "org.hibernate.dialect.Oracle12cDialect");
return secondaryEntityManagerFactoryBuilder
.dataSource(secondaryDataSource)
.packages("com.foo.secondary.model")
.persistenceUnit("secondaryDataSource")
.properties(secondaryJpaProperties)
.build();
}
#Bean(name = "secondaryTransactionManager")
public PlatformTransactionManager secondaryTransactionManager(
#Qualifier("secondaryEntityManagerFactory") EntityManagerFactory secondaryEntityManagerFactory) {
return new JpaTransactionManager(secondaryEntityManagerFactory);
}
}
I also tried org.hibernate.dialect.Oracle10gDialect, and set spring.jpa.database-platform=org.hibernate.dialect.Oracle12cDialect in application.properties, but nothing changed.
How can I properly configure dialect for oracle?

Answer 1

Spring Data JDBC does not support oracle dialect. You need to define your dialect that implements JdbcDialectProvider.
public final class OracleDialect implements DialectResolver.JdbcDialectProvider {
private static Dialect getDialect(Connection connection) throws SQLException {
DatabaseMetaData metaData = connection.getMetaData();
String name = metaData.getDatabaseProductName().toLowerCase(Locale.ROOT);
if (name.contains("oracle")) {
return AnsiDialect.INSTANCE;
}
return null;
}
#Override
public Optional<Dialect> getDialect(JdbcOperations operations) {
return Optional.ofNullable(operations.execute((ConnectionCallback<Dialect>) OracleDialect::getDialect));
}
}
Add spring-boot-starter-data-jdbc dependency in your build.gradle or pom.xml.
Then, as mentioned in the blog, create spring.factories file in resources/META-INF, and paste the following command:
org.springframework.data.jdbc.repository.config.DialectResolver$JdbcDialectProvider=<your-package>.OracleDialect
Also, since both databases you use are the same (OracleDB), you do not need to set .properties() for entity manager. As #SternK mentioned, you can have spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.Oracle12cDialect in your application.properties only.