Spring Hibernate Connection Leak - spring

Question

I'm getting below error after 5-6 requests.
org.springframework.dao.DataAccessResourceFailureException
Unable to acquire JDBC Connection; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
Using below code working perfectly, except it exhausts the connection pool after few requests.
I'm new to Spring framework, and made up all these using online samples. I have tried a few variants and all failed. Any help would be appreciated. Thanks.
application.yml
spring:
datasource:
type: com.zaxxer.hikari.HikariDataSource
dataSourceClassName: com.mysql.jdbc.jdbc2.optional.MysqlDataSource
jdbcUrl: jdbc:mysql://localhost:3306/db_name?autoReconnect=true&useSSL=false&useUnicode=true&characterEncoding=utf8
catalog: db_name
username: myusername
password: mypassword
testOnBorrow: true
validationQuery: SELECT 1
testWhileIdle: true
timeBetweenEvictionRunsMillis: 3600000
jpa:
show_sql: true
hibernate:
dialect: org.hibernate.dialect.MySQLDialect
show_sql: false
format_sql: true
connection:
provider_class: com.zaxxer.hikari.hibernate.HikariConnectionProvider
release_mode: after_transaction
...
ApplicationConfiguration.java
#Configuration
#PropertySource("classpath:application.yml")
#EnableTransactionManagement
#EnableSwagger2
#EntityScan("com...dal.data")
public class ApplicationConfiguration extends WebMvcConfigurerAdapter {
#Configuration
#ConfigurationProperties(prefix="spring.datasource")
public class JpaConfig extends HikariConfig {}
#Autowired
private JpaConfig jpaConfig;
#Bean(destroyMethod = "close")
public DataSource dataSource() {
return new HikariDataSource(jpaConfig);
}
#Bean
public SessionFactory sessionFactory() {
LocalSessionFactoryBuilder factoryBuilder = new LocalSessionFactoryBuilder(dataSource());
factoryBuilder.addAnnotatedClasses(
com...dal.data.MyEntity.class, ...
);
return factoryBuilder.buildSessionFactory();
}
TestDaoImpl.java
#Repository
#Scope(value = "request", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class TestDaoImpl implements TestDao {
private static final Logger logger = LoggerFactory.getLogger(TestDaoImpl.class);
#PersistenceContext
private EntityManager em;
#SuppressWarnings("unchecked")
#Override
public List<MyEntity> getEntities() {
return em.unwrap(Session.class)
.createCriteria(MyEntity.class, "myEntity")
.list();
}
#Override
#Transactional
public void saveTest(MyEntity test) throws OperationException {
try {
em.persist(test);
} catch (Exception e) {
logger.error("ERROR saving test", e);
throw new OperationException("PS-SERVER");
}
}

Answer 1

This Code is working good.
The issue was with another #Repository class in the project was doing
#Inject
private SessionFactory sessionFactory;
which was eating up the connection, even when the code will not be called in the test service. I'm still not sure how that works, but once i replace that code with
#PersistenceContext
private EntityManager em;
it worked.