Cannot get session using SessionFactory.getCurrentSession() in Hibernate5 with Spring - spring

Question

I am completely new to Spring and Hibernate. I am having some difficulty getting Spring and Hibernate to cooperate so that my Spring configuration returns a Session object from the SessionFactory object.
In particular, I have followed the tutorial at: https://www.baeldung.com/hibernate-5-spring. This tutorial is for configuring Spring and Hibernate for the H2 database. However, I am currently configuring Spring and Hibernate for Oracle 12.2. I have reflected the changes in the configuration files.
Just like the aforementioned site suggests, I have written a Maven project with all the required dependencies. Moreover, I am configuring Hibernate 5 with an XML-based configuration.
Please find the code below:
Here is the Spring - Hibernate configuration file:
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="com.test">
<property name="hibernateProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">create</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="debug">true</prop>
</props>
</property>
</bean>
<bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp2.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:#localhost:1521:ORCL"/>
<property name="username" value="sa"/>
<property name="password" value="sa"/>
</bean>
<bean id="txManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
Here is the Java code that I am using to try and secure the Hibernate Session object:
#Autowired
private SessionFactory sessionFactory;
public Session getSession()
{
Session session = null;
try
{
session = sessionFactory.getCurrentSession();
if(session != null)
{
System.out.println("Session is VALID.");
}
else
{
System.out.println("Session is INVALID.");
}
}
catch(IllegalStateException e)
{
System.out.println("getSession: Illegal State Exception: " + e.getMessage());
}
catch(Exception e)
{
System.out.println("getSession: Exception: " + e.getMessage());
}
return session;
}
Here is the project pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>Flow</artifactId>
<version>1.0-SNAPSHOT</version>
<name>Flow</name>
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<org.springframework.version>5.0.2.RELEASE</org.springframework.version>
<org.springframework.data.version>1.10.6.RELEASE</org.springframework.data.version>
<org.springframework.security.version>4.2.1.RELEASE</org.springframework.security.version>
<hibernate.version>5.2.10.Final</hibernate.version>
<hibernatesearch.version>5.8.2.Final</hibernatesearch.version>
<tomcat-dbcp.version>9.0.0.M26</tomcat-dbcp.version>
<jta.version>1.1</jta.version>
<hsqldb.version>2.3.4</hsqldb.version>
<oracle.version>12.2.0.1</oracle.version>
<commons-lang3.version>3.5</commons-lang3.version>
</properties>
<repositories>
<repository>
<id>maven.oracle.com</id>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
<url>https://maven.oracle.com</url>
<layout>default</layout>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>maven.oracle.com</id>
<url>https://maven.oracle.com</url>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework.version}</version>
<exclusions>
<exclusion>
<artifactId>commons-logging</artifactId>
<groupId>commons-logging</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- persistence -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${org.springframework.data.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>${jta.version}</version>
</dependency>
<dependency>
<groupId>org.apache.tomcat</groupId>
<artifactId>tomcat-dbcp</artifactId>
<version>${tomcat-dbcp.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.oracle.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<version>${oracle.version}</version>
</dependency>
</dependencies>
<build>
<finalName>Flows</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
What I am expecting to receive is a Session object; however, when I run my code, the variable session i returns null. Any help would be greatly appreciated. Thanks!

Answer 1

The hibernate property hibernate.current_session_context_class defines how SessionFactory retrieve the current Session. When using LocalSessionFactoryBean to build SessionFactory , by default it will set to SpringSessionContext which basically means Spring will mange the session for you.
So in most case , you don't need to get the session by calling sessionFactory.getCurrentSession(). Simply use #PersistenceContext to inject and use the Session:
#PersistenceContext
private Session session;